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Question DetailsAsked on 5/25/2017

average cost for 5 ton hvac gas/electric unit. roof mounted. including new duct work with 8 registers

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Depends on type of unit you have/want, heating capacity (the 5 ton undoubtedly relates to the heat pump unit, in colder areas it uses supplemental gas for heat - or you may have a combined system with a regular A/C and a conventional gasfurnace in one unit. Also of course the energy efficiency rating of the unit makes as much as a 100% difference in price from a bottom-end, box store type unit like a Goodman, to a higher end top-of-their-line Carrier, SKS, Siemens, Braun, Train XL, Daikin, or Friedrich for example.

Also, accessibility (especially for the duct work), whether you are talking flexible or rigid metal ducts, whether the duct routing is easy (like from a readily accessible basement or crawlspace with adequate headroom) or is buried in the walls so will need a lot of plaster/drywall repairs and painting afterwards, and whether the new unit can use the same size ducts or if the openings in walls and floors and such need to be enlarged all make a significant difference in cost.

And of course access to the roof - will a moderate contractor truck-mounted boom crane handle it or do you need a long-reach or high-reach RT or truck crane to get it on the roof ? That can make the difference between a few hundred $ for the crane to potentially several thousands - more like pushing $10,000+ in some cases with highrise condos whihc were built without a buyilding crane to lift HVAC equipment and roofing materials to the roof when needed.

Just off the cuff, I would say for a "normal" case not over 2-3 story house in most of the country the unit itself is likely to run at least $3000-6000 installed and could run to $6000-10,000 in higher cost areas - and up to around double that as you work up to top-end and very high efficiency units. Some extreme efficiency units (over SEER 20) can run $7,000-15,000 just for the unit, compared to the more normal $3000-4000 for a minimum code compliant unit.

The ducting - with 8 registers sounds like a 2-story or possibly more split-levels house - you MIGHT get for around $2000-3000 if very easy access or reasonable access and with flexible ducting. Difficult access or rigid ducting without very easy access, likely more in the $5,000 range - and occasionally more than that by up to several thousand by the time you get drywall/plaster repaired and repainting the repairs, and of course with real high-end finishes the sky is the limit.

Course, these are just very rough ballparks, sight-unseen and specific unit requirements unseen. You also did not say WHY you want new ductwork, or if it is actually needed - many times rigid ducting can be rehabilitated satisfactorily as long as it is not badly rusted or rusted through more than a place or few.

I remember one $50,000 embossed copper scene ceiling that had to be disassembled, ductwork changed out for much larger capacity, suspended ceiling height lowered to clear the new ducts, and the copper ceiling put back up and brazed panel by panel - totalling about $8000 just for that one room ceiling. Similar things can happen with high-end wood interior finishes, if you cannot find a way around tearing them out to do the ductwork. That is where mini-splits and multiple HVAC units in one house frequently come into play, to avoid running ducting where it is not feasible.

Heating and A/C is of course the Search the List category to find well-rated and reviewed vendors to bid your job.

Answered 3 years ago by LCD

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