I need a little advice on which way to proceed with a new system.
Im looking to have both the furnace and central A/C replaced in my house. The system is 18 years old and has worked fine but the A/C is starting to make me nervous. It seems to run for longer periods at a time and the electric bill is reflecting this.
My only complaint with the old system is I think it could dehumidify better on moderate days. The house is 2850 sq ft, with about 1350 of that being finished walkout basement. On days when the furnace is not running or the A/C is not on for extended periods of time the air feels clammy. Also, I think a two stage furnace would be nice for better winter comfort.
Ive had three contractors submit bids for the work. Ill list the specifics below:
Dwelling: 1500 sq ft Main floor, 1350 sq ft walkout basement. About 100ft of wall below grade. Well insulated and newer windows. Eight foot ceilings.
Trane 92% 80K BTU Furnace Single-Stage
Trane XE1000 2.5 Ton AC Single-Stage
Contractor #1: A little concerned that the AC would not run on the high stage much.
Heating: 80K, 96% 2-stage, variable speed.
Cooling: 3 Ton, 2-stage
Contractor #2: Concerned that on the hottest days, the unit would not keep up, but would dehumidify very nicely.
Heating: 85K, 95% 2-stage
Cooling: 2 Ton, 2-stage
No Load Calc. Based on lengthy conversation and performance of old system recommended the following:
Heating: 80K, 95% 2-stage
Cooling: 2.5 Ton single stage.
I appreciate any input you experts care to offer. Also, I'm an electrical engineer with a passion for home automation and AV systems. I'm happy to help any of you that I can with my expertise.