Insulating Air Conditioning Ducts In Attic

Here is a description of the phenomenon.

Insulating air conditioning ducts in attic.

Flexible ductwork comes with different insulation r values. 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. The air in your vented attic is hot and humid just like all outdoor air in florida. I live in montreal and had a lennox air conditioner and ducts installed in the attic.

How to insulate hvac ductwork today s homeowner. Fresh air ducts will focus on the fresh air in your air conditioning system. 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. A round duct is the most effective.

After all most new homes have r 49 insulation on the attic floor holladay continues. All the ducts are in the attic. Other times insulation may be on the outside. R 8 duct insulation 5 227 btu hour.

The condenser in your air conditioner works hard to get rid of heat and pressurize refrigerant for the return trip through your house. Imperial 6 in x 300 in insulated polyester flexible duct. Put it in an attic full of blown insulation and you re forcing. Find hvac duct fittings at lowe s today.

The attic duct is cold because cold air is flowing through it. For pricing and availability. So logically the ducts deserve more not less insulation. The metal duct boot the fitting that holds the register or diffuser that is visible on your ceiling is also cold.

Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. 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. Looking at the cooling side only the additional load would be. You will need less material than you would for a rectangular or a square duct.

Imperial 4 in x 60 in galvanized steel round duct pipe. Sometimes the insulation is inside the ductwork. I was wondering is there any figures on the expected energy temp lose. But the air in the ducts is facing a delta t of maybe 100 f or 120 f a greater delta t.

Make sure the foil surface of the insulation is free of dust before applying the tape. This old paper faced insulation on hvac ductwork needs updating. Attic insulation keeps summer heat waiting proper attic insulation prevents summer s hot air from entering the house.