Heat pump just died.
I have a Comfortmaker system -- forced air NG furnace 100,000 btu 80%eff. and 10 SEER heat pump. New in 1993. I live in Pittsburgh. I have a low kw rate for heat pump .04/kwh. and High NG rate of 11.39/mcfm. My house was new in 93 and is 2 story 2900 sf, not counting basement which is half underground. My gas bill last year was 200/mo avg and my electric was 100/mo avg. I had $400 gas bills in winter mos. Jan Feb. One contractor recommends changing system to 96% eff var spd blowwer 100,000 btu furnace and electic a/c 13 seer single stage r22 -- Amana brand. The Trane guy recommends 93% eff furnace 100,000btu with var spd blower.. and 13 SEER single stage heat pump. I think the heat pump has saved me some money over the years. Which set up should be the most efficient to operate? Do the new heat pumps operate at colder temps than my old one? Also should I consider a higher SEER rating and a 2 stage heat pump if a heap pump is the way I decide to go?