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.
Duct closure for attic air conditioner during winter.
Note that you can t use air permeable insulation like fiberglass to solve this problem unless the fiberglass insulation includes a polyethylene jacket.
The second possible remedy to your condensation problem is to prevent indoor air from entering the ducts during the winter.
Burying ducts in attic insulation.
If the space is too tight to do the work from the attic side you ll have to remove the drywall ceiling or a portion of the drywall ceiling to do the work.
When outside temps drop down below about 40 pretty much nov thru march condensation starts forming in the ducts and drips from some of the ceiling registers.
I live in montreal and had a lennox air conditioner and ducts installed in the attic.
You shouldn t install ducts in a vented unconditioned attic.
An air conditioner is designed to be used in all weather conditions.
Your attempt to plug the ducts with rigid foam was well meaning but ineffective almost certainly because your plugs weren t airtight.
The hot or cool air is coming out from the same air ducts it depends on how high or low temperatures and the hot or cold switch lever that you set the central air condition unit will automatically switch to hot or cold as you have controlled it.
Although this may sound like a great idea such covers are not ideal during cold months as they may trap moisture in your air conditioning system.
To do the required work one would normally access the area from the attic.
As most gba readers know ducts belong inside a home s thermal envelope not in an environment that s cold in the winter.
First winter after moving.
Next time use high quality tape to get a good air seal.
Closed cell spray foam is often useful to solve the type of problem you describe.
The heat exchanger is connected to a long duct running down the center of the attic from end to end.
Winterizing your home saves money hot air produced by heating systems in fall winter lose thermal values of 30 or more through the central air duct system.
In the winter the attic is very cold because the roof and gables are not insulated.
I have a dedicated ac system with the air handler in unconditioned attic heat is provided by hydronic baseboard.
Heated air rises and is drawn through unsealed central air conditioning vents into ductwork in the cold attic.
When outside temperatures drop down below about 40 pretty much nov thru march condensation starts forming in the ducts and drips from some of the ceiling registers.
Insulated flexible pipes about 7 inches inside diameter connect from the central duct to ceiling vents in each room.
You don t close the ac vents in winter leave them open in summer or winter.
I was wondering is there any figures on the expected energy temp lose.
