Ask Your Question

Angie's List Answers is the trusted spot to ask home improvement and health questions and get answers from service companies, health providers and consumers. For ratings and reviews on companies in your area, search Angie's List.

Top 30 Days Experts
Rank Leader Points*
1 kstreett 240
2 Guest_9020487 110
3 Guest_9190926 105
4 GoldenKid 100
5 ahowell 95
6 KnowledgeBase 95
7 skbloom 80
8 Guest_98024861 70
9 Guest_9311297 70
10 Guest_9400529 70

*Updates every 4 hours

Browse Projects By Category

Question DetailsAsked on 1/26/2016

Should my new HVAC system have clunking knocking pinging sounds?

I recently had a new HVAC system installed. My home is on a raised foundation. The duct work is under the floors. The sounds are not coming from the furnace but from under my floors which leads me to believe that it must be the duct work and my only guess here is that maybe the pressure of the air being pushed through the not properly secured ducting???

Do you have the same question? Follow this Question

1 Answer


Sounds like ductwork expanding and contracting - it would have to be terrible install for the minimal air pressure to do anything causing noise. Likely ductwork sliding in mounting straps, too tightly restrained so it is pushing and pulling against restraints, or ductwork not restrained enough. It can be a hit and miss thing with new ductwork to work out the noises, and commonly with a new system it takes a half dozen cycles or so of heating and cooling to track down and pad the noisy spots to stop the noise - so with a new system, you should call them back to fix the problem. If the ducts are new, could be anywhere - if old ducts new units, then would almost certainly be just at the new unit.
BTW - the clunk might be a air damper closing when the unit shuts down, which is normal but if real loud can be damped with felt tape at the contact edge. Knocking and pinging can be expanding and contracting sheet metal ducting, or panels in the furnace itself expanding and contracting, or even being pulled in and push out by the air change pressures in some cases. Bottom line - if objectionable noise, no your system should not be doing that. Minor ticks and minor metallic sounds, but nothing enough to disturb you or wake you up.

Answered 4 years ago by LCD

Related Questions

Terms Of Use
Privacy Policy