Insulating Air Conditioning Ducts In Attic

When the attic is 20 f that insulation is addressing a delta t of 50 f.

Insulating air conditioning ducts in attic.

Make sure the foil surface of the insulation is free of dust before applying the tape. Other times insulation may be on the outside. For pricing and availability. 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. All the ducts are in the attic. I live in montreal and had a lennox air conditioner and ducts installed in the attic. Here is a description of the phenomenon.

Flexible ductwork comes with different insulation r values. Imperial 6 in x 300 in insulated polyester flexible duct. The metal duct boot the fitting that holds the register or diffuser that is visible on your ceiling is also cold. This old paper faced insulation on hvac ductwork needs updating.

Looking at the cooling side only the additional load would be. The air in your vented attic is hot and humid just like all outdoor air in florida. Put it in an attic full of blown insulation and you re forcing. Find hvac duct fittings at lowe s today.

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. After all most new homes have r 49 insulation on the attic floor holladay continues. Sometimes the insulation is inside the ductwork. The attic duct is cold because cold air is flowing through it.

So logically the ducts deserve more not less insulation. You will need less material than you would for a rectangular or a square duct. What i ve observed attic temp 50c vent temp 21c attic temp 37c vent temp 18c attic temp 25c vent temp 13c not sure what the r value off flexible duct or main metal duct is. But the air in the ducts is facing a delta t of maybe 100 f or 120 f a greater delta t.

Imperial 4 in x 60 in galvanized steel round duct pipe. R 8 duct insulation 5 227 btu hour. I was wondering is there any figures on the expected energy temp lose. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.

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. Attic insulation keeps summer heat waiting proper attic insulation prevents summer s hot air from entering the house. A round duct is the most effective.