How do you size a residential central air conditioning and heat unit?
Do or have a heat load calculaton done on your home to measure heat loss for heating and heat gain for cooling. This is a pretty involved undertaking for a first timer, to get an idea do a Google search on HVAC Calc , download the free trial and give it a try. Otherwise let a pro handle it. But either way get one or more done, and don`t rely on just replacing what you have or a square footage estimate.
