We are looking to replace a 30-yr. old gas furnace and 17-yr. old A/C. We live in a split foyer type of house with app. 2000 sq. ft. So far we have had several estimates and are getting more and more confused. One company feels that the minimum BTUs for the furnace should be 100,000. Another gave us an estimate for 125,000. I had another guy come today who said we probably wouldn't need even 100,000 because the house was a split foyer. Of course, they are hard to heat and cool regardless of the unit. We have also been told conflicting opinions as to Seer and efficiency ratings. One told us that we needed a minimum 90% and 12 Seer A/C. The other told us that we would be fine with the 80% and 12 Seer. The recommended A/C unit is 3 ton. I don't know what we have at the present. One contractor did give us a price for the VS which is almost 2,000 more than the one speed 90%. I'm not sure that either of the two did a load calculation. The guy who came out today had pictures of the house and said that it would take at least a day to get an estimate. He seemed to be more knowledgeable in many ways and took more time to look at everything.
Can anyone give me any advice as to the efficiency ratings? We live in NC, thus have moderately cold winters and very hot, humid summers. I was also reading about the R-22 etc. so that is something I need to inquire about before purchasing.