Attic Insulation: What Homeowners Should Know

Heat rises — which means an under-insulated attic is one of the fastest ways a home loses conditioned air. In winter, warm air escapes upward and out through the roof. In summer, the process reverses: attic heat radiates down into the rooms below, making upper floors harder to keep cool.

Attic insulation works by slowing that heat transfer, helping your home hold onto conditioned air longer and reducing how hard your HVAC system has to work to make up the difference.

Not every attic is the same, though. Insulation level, ventilation, and any existing air leaks all affect how well an attic performs — which is why a proper assessment looks at the whole picture rather than just adding more material on top of what's already there.

If it's been years since your attic was last inspected, or you're not sure what's currently up there, it's a reasonable place to start when thinking about improving comfort and efficiency at home.