Save 20-30% on Heating and Cooling Bills with this Easy ‘Sweat-Equity’ Project
Your home’s duct system carries the air from your furnace and central air conditioner or heat pump to each room. These ducts are typically made of sheet metal, fiber glass, or other materials that easily conduct heat. Ducts are also usually located in unconditioned spaces and unfortunately, many duct systems are poorly insulated, or not insulated at all.
- 10 – 30 % of the energy used to heat and cool the air in your home is lost to conduction through duct surfaces.
- Poorly insulated ductwork results in hard to maintain temperatures in rooms served by long duct runs and can add hundreds of dollars a year to your heating and cooling expenses.
Start by downloading the instructions & materials list (pdf) and then watch this four-part instructional video series.
|Part 1: Insulate Ductwork|
Part 2: Supply Ducts
Part 3: Transition Ducts
Part 4: Hot Water Pipes
Three Easy Steps to Enjoy the Benefits of Insulated Ductwork
- Start by cutting the polyisocyanurate sheathing to wrap around the supply and return trunks’ sides and bottoms. Tape the cut pieces of sheathing to the trunks and adjacent sheathing using the foil faced duct tape.
- Wrap the 6 inch round distribution ducts with fiberglass batts. Keep in place using staples and string. Zigzag the string back and forth across the length of the fiberglass insulation batt and staple it to the joists or underside of the floor. Wrap or stuff fiberglass insulation around the sheet metal “boot” that connects the 6 inch pipe to the register.
- Cut the fiberglass batts to size and place on top of the supply trunks, between the floor joists.