Central Air Condenser on the roof or in a cage?

[Jay Garrison]

Hi,

I just had a HVAC guy come out and give me an estimate on 2 central air units for a 2 flat. The top floor gets pretty hot in the summer, flat roof. First floor is obviously much cooler. The quote they gave me has a 2.5 ton setup for the second floor, and 2 ton for the first. Does that sound about right? Each unit is 1000 square feet, 3/1. Thanks!