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Just raised the roof on a ranch house. Built a 12/12 pitch roof with dormers to add two rooms totalling about 700 s.f. Current hvac system is in crawlspace below first floor. I am thinking aux system for upstairs heat and a/c. Any ideas on units that would work for this application?
Tom
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May be a perfect application for hydronic radiant floors or ceiling on the heating side. Sounds as if this was actually a major improvement. Possibly worthy of an evaluation of the entire new heating/cooling load and comparison to the capacity of the existing equipment?
How old is the existing equipment?
Budget?
Exactly which phase of the pop-up are you in? Framing, insulation, sheetrock?
What is the space going to be used for? How will it be divided? ETc, etc?
*jj,The current hvac system was added last year to provide a/c. The furnace was sized to accomodate the additional space however the coil and condensor were sized for the previous load. I don't know the tonnage off hand. We are currently framing. I had intended to run additional ductwork of the existing trunk in the crawlspace, but it will create layout problems, long duct runs and and quite a bit of work in finished areas. I thought that it may be more cost effective and more comfortable to run another system. The space(700 s.f.) will be divided equally to a bedroom, office and walk in closets, one third each.The problem is probably not getting heat up there but cooling. Any help would be appreciated.Thanks,Tom
*If you have the room you could use a small electric furnace with a 1&1/2 ton (18,000 btuh) AC coil in the attic adjacent to the addition with a duct to each room and a single return centrally located. The freon lines could run down through a closet to the outdoor unit.
*I did a similar add-on a few years ago. I ran a supply and a return from the basement thru the back of a closet on the first floor and a closet above it to the attic. I ran 3-1/2" X 14" oval ducts to the ceiling registers and sealed the joints with mastic. The returns were on the walls near the floor level. For heat, I ran hydronic baseboards around most of the new second floor and radiant floor heat in the bathroom. With a thick layer of cellulose insulation in the ceiling and above the ducts, the A/C load was much LESS than it was before the addition.