We are adding 720 sq ft to our house. We will now have 2237 sq ft. Our question is, should we get 1, 5 ton unit or 1, 2 ton unit for the addition and 1, 3 ton unit for the existing house. Also, what is the best A/C brand (least maintenance, last the longest, cools the best)?
1 large system vs 2 smaller systems realy would depend on house lay out. Have you had any bids? If so what do they think (ask them why see if it makes sense)? First guess 2 units would cost more to install and cost more to operate, but that depens on many things.