Not sure if this is the right place to post this question---please send me somewhere else if it's not...We'll be purchasing a central air conditioner for our newly constructed home. It's 2 story and total 3720 square feet---about equal square footage on each floor. Furnace is a Trane---we'll be adding the AC after construction when we move in. Also will be looking to add an air filter as well. Any recommendations?? Thanks in advance for your help!