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Question DetailsAsked on 2/10/2015

What is causing loud banging/clicking noise

I live in a condo which was built less than two years ago. In the last two weeks, I have been hearing a loud clicking/banging sound seemingly coming from the first floor flooring or from the basement ceiling. It does not go off or on when the gas burner is working or when water is turned on or off. It occurs more often at night. It can last 2 or 3 seconds and up to 30 seconds. The HVAC repair person did not find anything wrong. It is loud enough to wake me from sleep. Any ideas as to what this may be?

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15 Answers


In all probability, the sound occurs just as often at other times but you don't hear or at least notice it with the daytime background noise, moving around in the house, etc. Also, one effect in many animals, including humans, is when asleep (or about to go to sleep) your nervous system puts more emphasis on hearing - both because the other senses are not receiving sensory input, but also as a hereditary defensive mechanism to wake you up if you hear noises when asleep. So - you tend to notice or react to a lot of noises at night that you would ignore in the daytime.

Here is a recent response on pipe creaking - which could well be what you are hearing, though you did say not related to water running so less likely.

Other alternatives - heating system exhaust duct expansion and contraction related to either the furnace/boiler or the hot water heater heating, housing on one of those creaking as it heats and cools, forced air furnace ductwork creaking as it expands and contracts - those should be easy to confirm or rule out, by listening near them as they fire and then cool down. If noise does not last long enough for you to run ndown there when you hear it, to force firing if you don't want to wait around for a long time have someone turn up thermostat (to turn on furnace/boiler) or run hot water (to make hot water heater fire).

Ditto if you have an on-demand water heater that might be cooling off and creaking as it cools down due to no use/

Also, on rare occasions, water softeners will make this type of noise during their flushing and self-cleaning cycle, especially with plastic tank ones - check what time of day yours is set for, and maybe make in daytime instead.

I have also heard this creaking and popping against wood quite loudly in older houses with a large (30-60 gallon) expansion tank mounted in the joist space overhead near the boiler/hot water heater - look like this (second photo)-

Also if you have a large overhead expansion tank likethat be sure it is not filling with water, because its weight could be causing joist creaking or it might be pulling connections free if it is - should be mostly full of air.

Otherwise, try running water (usually hot) and see if that makes it happen - then follow suggestions in the first link above about tracking whether it is water or drain pipes - in my experience, more commonly plastic drain pipes if a hard, sharp knock and metal water pipes if a creaking or ratcheting type noise, but more types of pipes can make several variations of noise.

Since you say wakes you from sleep, obviously if no one has gone to the bathroom or run water in the few minutes before that, takes that out of play.

If you have baseboard (hot water) or steam heat, those systems very commonly cause this sort of noise. The creaking or ratcheting click is more common with the pipes, condensed water in radiators can cause a very sharp bang - like someone hit the floor or radiator with a hammer.

I suppose it is possible there is a structural problem, but normally creaking and cracking of joists or trusses splitting or breaking come in just one or two noises at a time, not spread out over 30 seconds or so - and fairly quickly if this is going on day to day you would be noticing deflection of the floor or basement ceiling; or cracking of foundation walls if due to a foundation problem like from expansive soils or a sinkhole - quite rare for houses to have that problem, but can cause this sort of on-going audible noise. You could contact your building department about whether expansive soils or sinkholes are common in your area.

I don't suppose it sounds like clicking of nails - and uyou have a critter settling down to sleep or getting up to go to the bathroom in the night and you are hearing that (assuming this is more of less right below your bed). Or a squirrel getting up for a midnight walnut snack and you are hearing teeth cracking seeds/nuts - or chewing on piping.

Best bet if just listening around with your ear against faucet,walls, etc - I would buy a $10-15 METAL (plastic ones not as goodfor this) stethoscope at a box store pharmacy area and keep by bed, then next time you hear it just up and see if you can track down the source by listening at pipes, ducts, walls, floor, etc before it stops. Might take you several times to track down the exact location, narrowing down the search area each time it occurs until the sound stops.

Then when you tie it down you will know what sort of repair is needed - if duct might be a joint that needs joint sealer and some pop rivets, if duct or pipe creeping against wood then a protective plastic collar or rubber pad may be needed, or the opening around the duct/pipe opened up a bit. If creaking housing on water heater/furnace sometimes a few more sheet metal screws (or tightening) will do it - I have seen a couple of cases where it just could not be stopped until a brick or two was put on top to weight it down so it could not move. Had one old standup oil-fired boiler whose outer casing creaked terribly - like a halloween horror movie special effect - ended up putting a couple of bands of polyester shipping strapping around the housing to quiet it.

If in the flooring and you can't tie it down and does not seem to be flooring expanding and creaking because it lacks perimeter expansion room, then you might have to open up an inspection hole in the basement ceiling - head size hole, or about 1/2" hole and use illuminated fiber optic camera to look up in there and see what you can see, and maybe to use a rod or piece of wood to push against pipes or ducts while noise is going on to see which is making the noise.

One other thought - if you have a setback on the thermostat at night, try temporarily setting the night temp the same as daytime and see if that stops it - might if the creaking is from ductwork shrinking during the cooler night conditions.

Also - I presume this couldnot be something loose or hanging by the house, and you have been having wind gusts at night. Our snow shovels and such hanging by the front entry do this at time - bang a few times to half a minutes or so, just once or twice a night on breezy nights when the angle of the wind is just right. Try checking round outside and unhang anything that could be banging against the house.

Answered 2 years ago by LCD


Thank you LCD for your thoughtful advice. I am figuring that it is likely coming from pipes from the water heater or from ductwork. The thing is, it does not happen right after the gas furnace goes on or off. So could the cooling for the ducts cause this? I did put the thermastat up. Nothing happend. Likewise, using hot water or any water does not cause the sound to occur. Still, could the pipes be cooling or heating and thus makes this sound? It is more of a in "click, click, click, etc." I am fairly sure the sound is coming from the floor just about the gas burner. That said, my heating company came here yesterday and the repairman said he could not find any reason for the sound. There is a pipe that takes the condenation away from the burner. I hear the water flowing down that pipe. I have heard that since I moved into this condo, nearly two years ago (brand new). At times, I do hear a fairly loud 'bang' that accompanies the water flow. Perhaps the bang and the click, click, clicks are somehow assocaoted with each other?

i highly doubt that it is an animal. Just not the kind of noise. Also doubt that it is joists or flooring problems. Can't imagine that causing the clicking sound. Beside the HVAC comapny addressing this, who else would you suggest to take a look? I do try to run down to the basement as it occurs. So far, it stops before I get down there. And the one time I did make it, I just could not pinpoint it.

All in all, it is disconcerting. It can keep me awake and can be frightening, as I live alone.

Answered 2 years ago by Guest_9131175


Well - if running hot water and the furnace AND hot water heater firing do not cause it - either typically within 30 seconds to a minute or less after start of heating as the system heats up, and typically within a few minutes after shutdown as the pipes/ducts cool, lack of that certainly sounds like it eliminates those sources in terms of the thermal heating/cooling issue.

In that event, for the click itself I would be looking for any electronic/electrical device that could make a noise - a fire or water floor alarm triggering or low battery beeping but not making the usual expected noise - maybe due to low battery. Also any sort of high-temp emergency alarm over the furnace/hot water heater, for instance. Does not account for the associated banging, though.

Condensation dripping down in ductwork (which should not generally be happening except during the first few seconds after start of firing, as the moisture is supposed to be vented with the exhaust gas) can certainly sound like clicks at times - but not bang.

Therefore, the bang has me stumped. Tell me more about this condensation dripping - I don't know what you are talking about there - may be that system is plugging up or vapor locking and causing a small steam explosion ? What is the condesation coming from - water heater, furnace, or maybe tankless water heater ?

Since you live alone, unless you are prepared to take your sleeping bag or an old mattress downstairs for a few nights (say weekend where sleep quality is not as important), tracking this down is tough.

You could get a pair of baby monitors and put one at your bed, other in different rooms near different appliances and ductwork and on floor and such each night to hear where loudest - would have to be sure is at exact volume setting after each move to work.

What else if located around the place where you think the noise is centered - any other appliances or such ?

Since it is happening regularly, and does not sound like tearing or cracking wood, it is highly unlikely to be structural issues, though gradual foundation settlement can cause that sort of noise.

I am still tending toward ducting (assuming you have forced air furnace) - maybe a long run that expands and contracts and, because it is in floor joists and maybe insulated, is taking a long time to expand and shrink, and is hanging up. Maybe moving within a metal hanger or tight in the joists so it is locked up and releases with a bang, then creeps further to relieve the rest of the accumulated stress - like an earthquake with aftershocks. If that is the source, putting a monitor on the ducts should tell you if that is the source.

Ditto to putting monitor on the flooring a couple of places, in case it is flooring that lacks expansion space so it popping/banging as it pops loose at the edge(s), then creaks a bit further.

Other possibilities - unlikely but can happen - the housing on furnace or water heater or a cover plate on same not tightly fastened, so bangs and creaks due to expansion - especially on water heater, which would take many more minutes to heat and cool after firing.

If the above do not help, maybe the mobile sleeping spot will be the only solution - moving around the house from night to night, or even moving several times a night as the noise occurs. Of course, you would have to be awake enough each time to remember how loud it was and how far you tracked the sound with each occurrence.

Answered 2 years ago by LCD


Your willingness to offer help and knowledge base are just amazing. I want to thank you for your suggestions and advice. I am sure that it is not an electical device or alarm. The running water that I hear (from my bedroom which is over the basement) occurs every few minites. There is a pipe running from the gas furnace that takes the condensation from the furnace to another pipe. The heating company told me that the condensation is normal. When I moved in (just under 2 years ago), the builder did not attach this pipe to the next pipe. So, in fact, my son put it together. It is a hose running from one pipe into the other pipe. There is no doubt that after I hear the water run into the pipe, a banging noise occurs at least one third of the time. I am now thinking that that bang is the same banging I hear that I have been describing to you. The difference is that the bang, bang, bang sound does not occur after the water runs. Somehow, that is independent of it.

Sleeping in in the basement does not sound like a party to me. That is an understatement. The basement is unfinished and unheated. While that may well be what I need to do, I am going to have to muster much motivation to do so. Frankly, the notion gives me the creeps. And while I would say that I have at least a handful of people in my life who love me, I doubt that any of those people would agree to join me for a night awake with me in my basement.

I don't rightly think that a baby monitor would work. I know that the sound originates in the basement. I can't imagine that it would discern where in the basement the noise is coming from.

The builder's rep is stopping by on Friday. Any suggestions as to what I can say to him or have him do?

Again, I truly thank you!!!

Answered 2 years ago by Guest_9131175


To be clear, the bang I hear after the water runs in just one loud bang. The other noise I have been describing bangs anywhere from 5 to 30 seconds.

Answered 2 years ago by Guest_9131175


Welllllll... reread the whole thread - something is clearly not right, and I would suspect this is something that is going to cause a problem if it continues. However, I do not think it is an imminent hazard either.

I am presuming you have not smelled natural gas odorant at all, so the banging could not be a gas buildup exploding periodically ? Sniff around all gas appliances. The bang, particularly if fairly sharp and violent, could possibly be a small gas explosion from a small leak that ignites periodically and consumes the gas in one short boom - the creaking could then conceivably be from disturbed vent pipes or water heater/furnace casing moving back into position, but that is a really long shot.

Since you are not big on roughing it (at least not unless a last resort), how about a bit of somewhat roughing it to investigate ?

But first a totally separate thought - have you checked your water heater to make sure the emergency overpressure/overtemp valve is not discharging water ? When it blows off excess pressure (which it should not be doing - it is an emergency relief valve only) it can make quite a bang or more a thump or heavy bump, followed by a whoosh for a few seconds as it discharges hot water, then dripping to dry. Can also barely open and just release a bit of flow out the discharge pipe. Looks like this typically, with a drop pipe that should terminate just above the platform or floor, which is where the water would be showing up :

If it is blowing off (water standing around below it or recently came out of it into a drain) then your water heater is pressuring up - either due to overheating, excess generation of gas in the heater due to water supply shortage or restriction, or due to pressuring up of the household system as it heats. Since only 2 years old, obviously should not be doing any of those - but if it has an expansion tank, which commonly looks like this, in any orientation - the keg-like tank above the water heater -

which has filled with water instead of air, then as the water in the hot water heater expands due to heating, it backs up into the piping. If your system has a backflow preventer or pressure control valve on the incoming water supply (many areas do), then it cannot push water back toward the city line - so it pressures up the household piping instead as the water heats. The air pocket in the expansion tank is supposed to absorb this expansion, but if the diaphragm inside has broken it fills with incompressible water - so the pressure relief valve "blows down" - releasing a cup or so of water to relieve the pressure. Solution would be replacing expansion tank for less than $100 parts plus $75-150 Plumber labor typically. And should be mounted upside down for best performance.

Now - on the somewhat roughing it possible solution:

Of course, if happen frequently, maybe sit in basement with your favorite quilt or blanket and smart phone or tablet and play games till it happens, so you are close enough to get right to it while still making noise.

Otherwise, depending on how often this occurs, maybe on a weekend or day off when you will be home continuously and can handle roughing it a bit, try turning the water heater gas valve down to PILOT for long to cool down (say two hours, or an hour or so if turned off right after a long shower or hot laundry load) then let it stay off either until you hear the sounds occurring despite it being off for a goodly time, or till it has been off long enough that you can be absolutely sure that the sound should have occurred several times in that interval but has not. If sounds do NOT occur (meaning water heater is the source of noise), cause is probably either a water shortage to the heater so it is boiling vigorously periodically, or an exhaust duct or heater housing building up stress then popping free - though that does NOT account for the dripping sound unless they are click from a creaking metal housing, and would normally occur soon after firing starts or stops. Remember when you turn it back on to ON that it will take an hour or thereabouts to heat back up, if you are counting on a morning shower or such.

If the noise occurs anyway with the water heater off, assuming the ambient temps are above freezing (so you don't freeze pipes), and assuming you don't have household pets/plants that can't take some cold, try turning the furnace totally off (power off) the same way to see if that prevents the noise from happening. Hopefully it will not have to beoff long enough for the house to get really cold, which should take a good many hours unless well sub-freezing or windy outside.

If furnace is the source, could it be a zone control damper at a wye in the ducts (copntrols how much air goes through each duct for single system with multiple thermostats and zones) or an exhaust flue valve (located in the exhausdt flue right above the furnace) slamming shut, and the clicking maybe a solenoid chattering ? Though that would normally be happening during the firing cycle or soon after, while fan is still running.

I am really concerned on the condensation issue - there should NOT be a flow of condensate into the furnace, which also makes me wonder whether the HVAC technician might have missed something he should have seen. If a lower efficiency (typically not over about 85%) furnace with vertical metal flue up to above the roof, then if you are getting condensate dripping from it except maybe for the first few seconds after firing on cold days, your exhaust flue system is either too large, too long, or too cold so you may need a different size flue or a booster fan. If you have a high-efficiency (typically 85% efficiency or more) furnace with a plastic exhaust flue pipe, then that should be leading slightly downhill (after an initial vertical run of a few feet at furnace) to an outside wall to release the exhaust gas along with the liquid condensate. From amount of condensate yuo are talking I suspect this is the case. In some circumstances where the flue has to go uphill to reach the outside then the exhaust pipe would have a dripleg (short vertical downward Tee section with drain fitting) in the flattish sloping section of the flue close before the vertical section leading from the furnace, with a drain hose attached to trap the condensate and lead to a floor drain or such.

If you are able to attach anoverall photo of water heater, and another of furnace clearly showing the drain hose/pipe, it just might possibly help me figure this out. You can attach photos using the leftmost yellow icon right above the My Answer box that comes up when you use the Answer This Question button which you have been using to reply back.

As for what to say to the builder's rep - all you can do is explain what is happening and how frequent and how long this has been going on, and if you thought it would help let him read a printout of this thread for possible ideas.

If in warranty period still I would be getting this complaint in writing to them if not done already,so its existence is documented BEFORE the warranty runs out.

If no joy there, I would say try another HVAC contractor - because I am getting more convinced the HVAC system is the source of the issue.

Answered 2 years ago by LCD


An afterthought after rereading the whole blog again:

1) could be the click-click-click sound it totally separate from the bang, and is from a pipe or more likely duct hung up on a joist or hanger that is creeping - solution for that one would be opening up basement ceiling (if not open already) and padding it where it sits on hangers or joists with rubber pads (or even rags as a test) to see if that stops it.

2) the bang after the water running - I am presuming the water runs after the blower has been going for awhile. If this is during heat mode (as I have been assuming) then I would wonder if the hose is going the right place - is it leading to a floor drain or sewer connection ?

3) One other possibility came to mind - if you mean the condensate is from the air conditioner evaporator (looks like radiator, in the ducts usually just downflow of the furnace), then that would be normal to discharge significant trickle of water fromthe evaporator when A/C is working - in which case the bang after the trickle could be the air conditioner shutting down ?

I am about tapped out with ideas - guess if you can't trace it in next day or two then talk to the builders rep and see what he/she says, and decide where to go from there - my roughing suggestions, different HVAC tech, or whatever.

Good luck - this is an interesting situation, but no longer so from your perspective, I am sure.

Answered 2 years ago by LCD


I finally was able to be in the basevent as the bangina was occurring. It is, in fact, coming from the duct just outside the gas furnace. After the banging occurred, the furnace went on.

I did did have the builder's rep stop by. Unfortunately, his modus operandi is to 'do nothing' and/or 'do nothing.' Of course, yesterday, he remained true to form.

I will contact the heating company on Monday and have them come here again. After contacting my neighbors by email (36 homes), two told me that they had a similar noise. One said that a water bottle and sheet rock were stuck in her ductwork. After three visits, the heating company found it removed it.

i still do not know what is causing the bangs, but at least now know where the heating company needs to look.

I can not end this without re-stating what I have already said. You are extremely knowledge and even more kind (to have offered so much assistance and time). Thank you!

Answered 2 years ago by Guest_9131175


I am glad you were able to at least tie down where it is coming from - and you are wlecome for the efffort. It is rare to hear back from the questioners - either to hear if the suggestions were any help, or to hearwhat the final result or cause of the problem was found to be.

When tracking down the actual cause, of course it could be the duct creaking as it cools off, and just happened to creak for you just before the furnace kicked on again - especially likely in cold weather like if the furnace is cycling just every few minutes (as opposed to every half hour or hour) as the ductwork would still be in active cooling.

However, could also be (and more likely to be if always happens just before the furnace kicks on) that you have a split-zone damper - a butterfly valve basically, which uses sensors to determine howmuch airflow should go to each of several zones. is installedin a wye in the duct, typically near the furnace, and might be actuating (or trying to and failing, so activates several times) just before the burner kicks on.

Another possibility, if you have a high-efficiency furnace with PVC (plastic) exhaust flue - it has an electrically controlled damper and fa nunit a few feet from the furnace typically, which the controller directs the damper (which keeps cold air from coming in the exhausst flue) to open and the exhaust fan to turn on just before firing - andwillnot fire before these do that. If the damper or fan is failing to function correctly it might betrying several times before it succeeds - which ofcourse will wearthe actuator out in short order if that keeps up.

Answered 2 years ago by LCD


Unfortunatly, I am more distressed now than I have been. The banging has not stopped! I had the heating company who installed the unit come to my home twice today. The repairman suspected that it was one of the dampers and disconnected it. I was relieved to find out what was causing the banging. However, less than an hour later, the banging occurred again. I called the heating company and received an unpleasant response. In a nutshell, they blamed me. They said that I had stated that it was the damper causing the noise and now I was saying it was not. Hey, I have no idea what is causing the noise. All I want is for it to stop. The repairman returned and told me that I should understand the company's position. He was called back and they had to pay him overtime to do so(it was 3:30 pm.) He questioned whether it was actually coming from the heating system. All I could do is show him where the noise was coming from and play a recording of the noise (I did record it on my iPad.) I see this as an example of not respecting me as I am a woman. I do not believe that they would respond to a man in this way.

I am frustrated. I do have a recording of the noise. Would it help for you to hear it? Is there any mechanism by which I could send the recording to you? Do you have any advise as to how I should proceed with the heating company? I slept about 4 hours last night as the banging occurred at 1am and then again at 5am.

Thanks again, in advance.

Answered 2 years ago by Guest_9131175


You know - one thing I did not think of, being a condo - is there any chance this is some neighbor trying to get back at you for some slight or whatever, and the bang is actually coming from adjacent unit ?

Answered 2 years ago by LCD


Answered 2 years ago by LCD


Darn - so close, yet so far away.

See if, using the same Answer This Question, you can transfer the sound file using the Embed Video tool above the Your Answer box. If not, contact member care about maybe them embedding in for you, or if all else fails asking them to eMail the sound file direct to me at the address they have on file, though of course I would then be the only one hearing it.

If single bang is hard to tie down - if a series rather than single bang, sounds like back to the campout method, putting your hand or stethoscope on piping and ductwork to feel / hear vibration when it happens, even if you have to do it from upstairs instead of basement.

BTW - of course, damper should be hooked back up so your HVAC system works right. If your ducts are exposed in the basement, maybe ask them to wrap the supports and hangers in sheet rubber or flexible heavy plastic sheet too where they can reach them, so if caused by jamming up and slipping ducts as they expand and contract will maybe kill the problem that way. And visually check for any ducting without proper number or location of connecting screws.

You know - one thing I did not think of, being a condo - is there any chance this is some neighbor trying to get back at you for some slight or whatever, and the bang is actually coming from adjacent unit ?

Answered 2 years ago by LCD


I recorded two periods of banging noise via an app I found on my iPad. They need to be downloaded via a computer in itunes. My son has my computer, so I am going to have to get it from him. I don't know how to get it to you, but I will contact Angie's List on Monday and ask them if they can help.

At at this point, what is most distressing is the manner in which the heating company is behaving. They are hostile and chosing to be unhelpful. If they took an approach whereby they said they would work to get to the bottom of this, I would feel relieved and encouraged. So now, not only do I have a strange noise in my home, I have no cooperation in solving it from them.

I am am wondering if I should contact an engineer and/or a plumber. I don't much mind paying someone if they helped to solve this. Your thoughts?

i am also contacting a lawyer who can represent me both with the heating company and the builder. I have had flooding in my basement since I moved in (great builder, huh?) and had to enlist an attorney to get the builder to take steps to address it.

I plan to use the recorder again tonight. While it requires many hours of listening in order to find the 5 to 60 seconds when I hear the banging, I am hoping the more examples I have, the more likely someone can figure out it's cause.

Okay, enough!

Answered 2 years ago by Guest_9131175


OK - while I am not inclined to provide my eMail here, if AL can forward the audio files to me at the eMail they have on record for me, I can certainly listen to them - let themm know I have approved that on this blog. I have iTunes so should be no compatibility issues. Can also read PC originated MP3 and WAVE and similar common Windows format sound files. They may also be able to post them in the Video post section of Your Answer on this blog so everyone could hear them - like a Youtube video with only the music. For that matter,if you or your son ever post on Youtube, you could put it there temporarily as a home item of interest and just post the link here.

Might take an extension cord to leave the charger connected to get whole night worth, but you could place the iPad several different places (unless you are worried about vermin eating it) where there is no risk of it falling off and (paying attention to which way speaker is facing) hear where it is loudest over several nights. Of course, as you say, takes a lot of listening time to tellwhere it is on the recording, unless you can fast-forward the playback with audio still playing with the app you are using.

A pair of cheap baby monitors would do same thing real-time - being careful to keep them at same volume level when moving the basement one around (kkeping other where you are or by bed at night), try setting right next to furnace then next to ducts, on top of duct vent into your room, and by sewer pipe, water pipes at different places in basement to narrow down where loudest.

Problem with using an engineer, plumber, handyman, etc is they would have to spend a LOT of time there ($$$) to tie it down. They might be able to fiddle around and find potential tight spots or loose duct joints that MIGHT be causing it - but in many cases it is caused by something like a duct "dimpling". You know how a plastic bottle will pull in as it gets cold, even to the point of creating a crease or dimple ? Like if you leave it overnight in a cup holder in your car on a cold night or in the reefer. Then pops back out when it warms back up again. Metal ducting will do that too - rarely to the creasing point, but the larger flat surfaces can dimple in and out, making quite a bang when they do it. Commercial ducting has reinforcing and a slight outward-bulge construction to reduce the chance of this, but most residential ducting is perfectly flat so wobbles in and out pretty easily.

I keep forgetting - are your pipes and ducts exposed in the basement ? If so, you could go along at a couple of different times of day (presumably night best) and try pushing and prodding at each and lifting themm up a tad wherever you can and see if you can cause it to make the noise prematurely - before it normally would. Then relieve the friction at that point or (with duct) even temporarily tape a prop against it to keep it from moving and see if that stops or affects the noise. Or if unable to do yourself, seeif you can find a Handyman with some plumbing and ductwork experience and let him play at it for an hour or so for probably about $50. Might be more money down the drain, or he might get lucky and tie it down (or several possibilities) and be able to tape, insulation, isolate, free up, or whatever those points - even if it does not totally sole the issue, if he keeps track of where he found possible points, that narrows it down a lot of the sound changes a lot after doing so - then more deliberate anti-friction supports or building a wood frame around the ducting to prevent sheet metal warping could be tried to kill the sound.

You also did not say if you have your thermostat on set-back to a lower temp at night. If so, try eliminating the setback for a few days - leave at constant temp 24 hours a day. If that stops or almost stops it, then you know you are looking at thermal expansion/contraction noise, and most likely in the ducting.

If a dull thump or plastic or breaking wood type "snap" sound, I would say more likely pipe noise - generally plastic sewer pipe if quite loud. If a metallic bang or "clang", then almost certainly ducting (assuming you have rigid metal ducting, not flex duct).

On the HVAC contractor getting cranky - who is paying him ? If the builder, he is probably getting pressure from the builder and you - being pulled in two directions. I would say time to put pressure on the builder - though he may say since more than 1 year (as I recall) then tough, not under warranty. Would likely also argue that some creaking and banging of the ducts is normal - and to a certain extent that is right, though maybe not to the point of waking you up every time.

Fraid that's about all I can offer, other than listening to the sounds if you are able to get them through.

Answered 2 years ago by LCD

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