I have a single story ranch where I am having a central AC installed. The house has forced air heating so there is existing ductwork. I had an installer here for a quote and he told me that the area is about
1500 sq. ft and he would put a 2.5 tonne unit. I have a family room with no ductwork and a separate heating unit. I would have a window AC in that room. The area for that room is not included in the 1500 sq ft mentioned above. This family room is connected to the main house through the dining area so there is no door.I want to know if the size of the unit is correct? He said that if he puts a 3 tonne unit in, it might have problem pushing the air through the existing ductwork which is not top quality. So it might cause more problems than a 2.5 tonne unit. Also these parts of northeast don't need that much cooling so it should be sufficient.
He offered me a 10 SEER unit (brand new, Rheem) with a 5 year warranty. Compared to the 13 SEER unit (also Rheem) with a 10 year warranty (on the condenser, for both), this one costs me about $450 less. I think I would be ok with a little less efficient unit and lesser warranty but is there something else on the 10 SEER unit that I might want to take into account now?
Finally, is there any other question I should be asking the installer to verify the quality of the install? I have gone through some posts in this newsgroup and I understand the quality of the installation is as important as the quality of the unit.
Thanks in advance for your time.