Insulating Air Conditioning Ducts In Attic

Make sure the foil surface of the insulation is free of dust before applying the tape.

Insulating air conditioning ducts in attic.

How to insulate hvac ductwork today s homeowner. Hot air tends to rise and an attic is the best place for hot summer air to creep inside your home and destabilize the efforts of your hvac in maintaining a cool temperature. R 8 duct insulation 5 227 btu hour. Imperial 4 in x 60 in galvanized steel round duct pipe.

Looking at the cooling side only the additional load would be. For pricing and availability. Other times insulation may be on the outside. A round duct is the most effective.

Attic insulation keeps summer heat waiting proper attic insulation prevents summer s hot air from entering the house. Find hvac duct fittings at lowe s today. Fresh air ducts will focus on the fresh air in your air conditioning system. The attic duct is cold because cold air is flowing through it.

When the attic is 20 f that insulation is addressing a delta t of 50 f. Sometimes the insulation is inside the ductwork. The condenser in your air conditioner works hard to get rid of heat and pressurize refrigerant for the return trip through your house. This old paper faced insulation on hvac ductwork needs updating.

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. The air in your vented attic is hot and humid just like all outdoor air in florida. The metal duct boot the fitting that holds the register or diffuser that is visible on your ceiling is also cold. You will need less material than you would for a rectangular or a square duct.

I was wondering is there any figures on the expected energy temp lose. I live in montreal and had a lennox air conditioner and ducts installed in the attic. Imperial 6 in x 300 in insulated polyester flexible duct. All the ducts are in the attic.

After all most new homes have r 49 insulation on the attic floor holladay continues. Flexible ductwork comes with different insulation r values. Here is a description of the phenomenon. Put it in an attic full of blown insulation and you re forcing.

According to rightsuite the software we use the supply ducts have about 560 square feet of surface area and the return ducts 101 square feet. Because the moving air is in the ductwork for only a short period of time it does not need the insulation r value the attic floor requires. But the air in the ducts is facing a delta t of maybe 100 f or 120 f a greater delta t.