My crawl space is averaging 72 humidity right now raleigh nc.
Insulate plenum attic.
This isa recently installed system performing well indoor humidity steady at 45.
Typical ducts install between a plenum or large supply duct and.
I had to completely gut the existing hvac system in my 1991 house due to numerous major issues flex tubing like swiss cheese facing into the plenum kinks leaks a branch off the end of the trunk returns in the wrong place missing registers in some rooms too many in others etc.
Should you always insulate the plenum on an attic furnace ac horizontal setup.
Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
Getting a new complete system inside and out.
Mine is an 80 furnace 92 ac.
Add weatherstripping around the perimeter and a sweep to the door of a walk up attic.
Attic hatch or door.
Two other companies both use internally insulated and claim they are the way to go.
Especially applicable in humid southern climates.
Affix rigid foam insulation to the attic side of the hatch or door.
6 8 insulated fleixible duct lines come off of the plenum.
Then you ve got r318 4 to consider.
Try r316 3 r316 4 r316 5 4 you might claim an exemption under r316 5 4 1 and 2 but could really piss an inspector off.
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.
Describing the general internal insulation technique to stop your ac unit from sweating on the outside.
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.
Two of the competing companies are rated second and third in a recent local area service rating guide one of which.
One company is touting externally wrapped insulation for the metal plenums as their key value proposition over internally insulated metal plenums.
Insulating the plenum on a forced air system.
Insulating exposed heating ducts in attics basements and under subfloors can improve the energy efficiency of a heating system.
Hello i have a difficult situation.
