Affix rigid foam insulation to the attic side of the hatch or door.
Insulate plenum attic.
6 8 insulated fleixible duct lines come off of the plenum.
The plenum is about 7 feet long x 2 feet wide x 1 foot high.
Especially applicable in humid southern climates.
Getting a new complete system inside and out.
Typical ducts install between a plenum or large supply duct and.
I don t see any mold or mildew on the joists the floor insulation is dry and there is no condensation anywhere except the supply plenum covered in condensation soaked on bottom and to lesser extent the return plenum.
In a vented attic this can happen when the duct is in close proximity to conditioned space i e the ceiling and also thermally isolated from the hot attic beneath the ceiling insulation.
In this case the temperature gradient between supply air and the ceiling can be such that the duct surface could be cooler than the local dew point.
Hello i have a difficult situation.
Two other companies both use internally insulated and claim they are the way to go.
One company is touting externally wrapped insulation for the metal plenums as their key value proposition over internally insulated metal plenums.
Should you always insulate the plenum on an attic furnace ac horizontal setup.
Insulating the plenum on a forced air system.
After ripping everything out in the house and basement now the trunk is.
This isa recently installed system performing well indoor humidity steady at 45.
Pull down stair or ladder.
Insulating exposed heating ducts in attics basements and under subfloors can improve the energy efficiency of a heating system.
Two of the competing companies are rated second and third in a recent local area service rating guide one of which.
Mine is an 80 furnace 92 ac.
My crawl space is averaging 72 humidity right now raleigh nc.
Add weatherstripping around the perimeter and a sweep to the door of a walk up attic.
Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
Describing the general internal insulation technique to stop your ac unit from sweating on the outside.
Attic hatch or door.
