As that warmed air leaves the interior wall cold attic air moves into the cavity to take its place.
Cold air coming through walls.
Put up pictures or a mirror on exterior walls doing so can help insulate walls from the outside air.
Cover your windows with thermal draperies.
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Without them you have a large hole that is constantly letting cold air enter your home.
The warm air then rises into the attic a process called the stack effect.
Cold air coming through cracks and crevices in a window will lower the temperature of a room and make your walls cold.
With cold air inside the wall and warm air on each side in the house heat moves through the drywall which has a low r value and warms up the air in the cavity.
Air infiltration occurs when outside air finds its way inside your house.
Big enough for two couches the room has two walls of windows 15 foot ceilings and a fireplace.
You can expect higher heating and cooling bills if you have a lot of air infiltrating into your home.
Or in the summer when the hot 100 f air finds its way into your cool inside living space.