Leaky ducts on forced-air heating and air-conditioning systems are a common problem, contributing to both lower indoor-air quality and lower energy efficiency. They also make mold and decay more likely. The seams of supply and return ducts should be sealed with mastic or an appropriate HVAC tape. Don’t use hardware-store “duct tape,” which dries out quickly and fails. If your home has ducts that run through an unconditioned space (such as an unheated attic or crawlspace), the ducts should be insulated.
Seal ducts for savings!
