Everyone here has been a great help (especially skyheating)
I've pretty well narrowed my choice on a heat pump + furnace to two contractors. The interesting thing is that they're suggesting two different BTU's for the HP and furnace. My location is in the Portland, Oregon area. 2800 sqft single level 1994
Carrier Infinity series (59tn6080e17 2 stage furnace) and a Infinity 16 Heatpump (25hnb648 4 ton 2 stage) with CNPVP4821 coil.
Trane XV95 (TDH2B060A9V3VA 2 stage furnace) and a XL15i Heatpump (4TWX5036B 3 ton) with 4TXCC044BC3 coil
Now the interesting thing is even though both did a Heat/Cooling Loss Calculation, they are suggesting two different sizes for the equipment. I inquired about that and (of course) their both right. Carrier said that it was because the cooling load required the 4 ton HP which required the bigger blower/furnace.
I thought this was all very interesting considering all three used the same software and had the same measurements, etc., that I provided. The other thing is that I'd like to consider fairly the Carrier system, but it seems oversized ? compared to the Trane.
Current System: Coleman 100,000 @80,000 out and HP Coleman 3.5 ton
Carrier Calculations: Heat: 38,122 Cooling: 29,468 (Winter: 22F/70F Summer: 87F/75F)
Trane: (did not provide, but see equipment above)
Independent that I hired: Heat: 34,910 Cooling: 57,500 (Winter: 26F/70F Summer: 87F/75F)
I'd appreciate any comment on the equipment or the heat/cooling load.