My house is about 20,000 sq-ft in sunny Florida. My system right now is a 3 ton manufactured in 1994; the house was built in '95. I bought a new Bryant Evolution 18 Series 288ANA 4.0T 2-Stage system from an on-line dealer and plan to hire a contractor to install it for me. My question is what is the best handler to match with this system? The same dealer has a new Carrier FVM4X60. The SEER of the condenser is 18, will the choice of the handler affect that? Also will a 5 T handler be better than a 4 T or a 3.5 T. Thanks in advance for the response.