As you can imagine, in our area around summertime, we get this question a lot. This is also why our home inspections are so popular. Our techs can come out, look at all the different variables, and give you the specific answers you need. Generally speaking, the causes are: Your home is older, and the overall sealing has become weathered. Your attic insulation isn’t pulling its weight properly. Your ductwork is also not working as it should, or optimally. The AC unit you have isn’t properly sized. Your AC equipment is simply dated and needs to be upgraded.