Homes gain heat through walls and ceilings.
Insulating and tightening a home reduces heat gain. When adding ceiling insulation, keep in mind that the first few inches of insulation are the most important. Once the home has several inches of insulation, there is a diminishing return on adding more. For more information, go to Insulation Basics . Adding wall insulation Most older homes do not have wall insulation, but walls can be blown with insulation by a qualified insulation contractor.