Insulating Air Conditioning Ducts In Attic

But the air in the ducts is facing a delta t of maybe 100 f or 120 f a greater delta t.

Insulating air conditioning ducts in attic.

Here is a description of the phenomenon. R 8 duct insulation 5 227 btu hour. A round duct is the most effective. 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. I was wondering is there any figures on the expected energy temp lose. Looking at the cooling side only the additional load would be. 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.

Fresh air ducts will focus on the fresh air in your air conditioning system. I live in montreal and had a lennox air conditioner and ducts installed in the attic. Make sure the foil surface of the insulation is free of dust before applying the tape. For pricing and availability.

You will need less material than you would for a rectangular or a square duct. This old paper faced insulation on hvac ductwork needs updating. The metal duct boot the fitting that holds the register or diffuser that is visible on your ceiling is also cold. 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 air in your vented attic is hot and humid just like all outdoor air in florida. All the ducts are in the attic. Flexible ductwork comes with different insulation r values. How to insulate hvac ductwork today s homeowner.

When the attic is 20 f that insulation is addressing a delta t of 50 f. Sometimes the insulation is inside the ductwork. Put it in an attic full of blown insulation and you re forcing. Imperial 6 in x 300 in insulated polyester flexible duct.

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. Imperial 4 in x 60 in galvanized steel round duct pipe. Attic insulation keeps summer heat waiting proper attic insulation prevents summer s hot air from entering the house. The attic duct is cold because cold air is flowing through it.

After all most new homes have r 49 insulation on the attic floor holladay continues. So logically the ducts deserve more not less insulation. Other times insulation may be on the outside.