I'm new to this board so I thought I'd try it out. I'm moving and the house I bought will need a new furnace. It has 1125 sq.ft. of living space, a downstairs den with the main living area upstairs. What size furnace do you think uld be the right size for this house? I'd rather it be more than adequate so the unit won"t have to work too hard. I live in the midwest just to say. Also Iwant to install a whole house fan in the attic. Which wallwould be better the north side or the south? Thanks.