Why is my upstairs so hot even with the AC on?

In most homes with comfort problems, the problem isn’t the AC. Corbett Lunsford puts it at 75 to 80 percent: the problem is the house itself, the air sealing and the insulation, not the equipment.

On a recent job here in Mobile, the upstairs bedrooms still weren’t comfortable after two hours of the AC running. The thermal camera found missing insulation at the vaulted ceilings, along the front walls and above the stairs. A bigger AC wouldn’t have fixed any of that. That’s why we test the house with a blower door and a thermal camera before anyone replaces equipment.