Our experts take a comprehensive look at your attic and identify vulnerabilities and opportunities to optimize energy efficiency. In a typical residential home, some 40% of your winter heating and summer cooling is escaping through the attic and roof. It’s easy to forget about attic insulation in Toronto and elsewhere in the GTA since it’s nestled away from sight. But inadequate attic insulation in Toronto can lead to many problems around the home from declining air quality to expensive utility bills.