If you can't tell already I am replacing a heat a/c unit. I live in south east Michigan and wonder how efficient of an a/c I should purchase? Of course salesmen have there opinion what is that of the group here?
I would say 10 SEER to 12 SEER is the most common, being the easiest to achieve. Most heating contractors will try and push a 13 SEER, which will cost you a little more but may also qualify you for some utility rebates???