Insulating Air Conditioning Ducts In Attic

The attic duct is cold because cold air is flowing through it.

Insulating air conditioning ducts in attic.

Find hvac duct fittings at lowe s today. Imperial 6 in x 300 in insulated polyester flexible duct. Attic insulation keeps summer heat waiting proper attic insulation prevents summer s hot air from entering the house. The air in your vented attic is hot and humid just like all outdoor air in florida.

I was wondering is there any figures on the expected energy temp lose. After all most new homes have r 49 insulation on the attic floor holladay continues. Fresh air ducts will focus on the fresh air in your air conditioning system. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.

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. How to insulate hvac ductwork today s homeowner. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Sometimes the insulation is inside the ductwork.

Put it in an attic full of blown insulation and you re forcing. But the air in the ducts is facing a delta t of maybe 100 f or 120 f a greater delta t. This old paper faced insulation on hvac ductwork needs updating. A round duct is the most effective.

Other times insulation may be on the outside. 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. The metal duct boot the fitting that holds the register or diffuser that is visible on your ceiling is also cold. Here is a description of the phenomenon.

R 8 duct insulation 5 227 btu hour. I live in montreal and had a lennox air conditioner and ducts installed in the attic. You will need less material than you would for a rectangular or a square duct. Flexible ductwork comes with different insulation r values.

The condenser in your air conditioner works hard to get rid of heat and pressurize refrigerant for the return trip through your house. When the attic is 20 f that insulation is addressing a delta t of 50 f. 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. Looking at the cooling side only the additional load would be.

For pricing and availability. All the ducts are in the attic. So logically the ducts deserve more not less insulation.