Central A/C and Furnace Sizing
Central A/C and Furnace Sizing
(OP)
Can someone help to size a central A/C unit for 2040 sq. ft. townhouse in South New Jersey. It is a 2 storey townhouse with 7 rooms. It has 3 exposed walls i.e., front, back and one side. It also has a basement which is not airconditioned and is not part of the 2,040 sq. ft.
The builder is putting in a 3.5 ton unit (10 SEER). I do not remember the furnace size but I know for sure it is a gas fired one. All the insulations are as per Energy Star specs.
Is the A/C unit of the right size?
Your help and guidance will be highly appreciated.
The builder is putting in a 3.5 ton unit (10 SEER). I do not remember the furnace size but I know for sure it is a gas fired one. All the insulations are as per Energy Star specs.
Is the A/C unit of the right size?
Your help and guidance will be highly appreciated.





RE: Central A/C and Furnace Sizing
http://hvac-talk.com/vbb/
Also take a look at their load calc software at this link:
http://www.hvaccomputer.com/main.asp
Either way, you want higher than 10 Seer!
RE: Central A/C and Furnace Sizing
We were told (horrors!) that many salespeople will try to sell you a 5 ton system, but that often, your ductwork cannot handle the airflow.
TTFN
RE: Central A/C and Furnace Sizing
Every building is different, and the design conditions differ GREATLY between South Jersey and Southern California.
The peogram mentioned earlier, HVAC-calc, is a good way to get an idea of the size to satisfy your own curiosity, and to confirm what the contractor is telling you. I strongly recommend it. It is the wisest way to invest 40 bucks when you're starting to hire contractors for replacement or new installation of HVAC equipment.
Good luck.
Dave
RE: Central A/C and Furnace Sizing
Yes, they may refer him to a pro for the sizing question, but they will be most helpful when discussing all other questions concerning the equipment and install.
RE: Central A/C and Furnace Sizing
RE: Central A/C and Furnace Sizing
http://www.leeric.lsu.edu/bgbb/7/ecep/hvac/a/a.htm
The heating and cooling load maps show that New Jersey and So. Cal. are within about 15% of each other.
TTFN
RE: Central A/C and Furnace Sizing
MechTech1