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8gv · 01-16-2022, 10:03 PM

Smell? Get the furnace human to do a tune up.

Cycling a lot? See above AND it's been very cold out.

Also...
Make sure nothing is open to the outside such as an unlocked double hung window with an upper sash that has dropped a bit.
If you have a whole house fan that is open to the attic it must be covered from above.
Are any cellar windows opened a crack?

Filter? Make note of the direction the air travels. You'll want to install the new one the right way. The filter has its size in inches on its edge. For example it might be 20"x20"x1".

Filters come in varying capability. The hardware store, big box or small, will have guidance on that so you may pick your level of paranoia.

01-16-2022, 10:03 PM	#5
8gv Senior Member Join Date: Jan 2012 Posts: 2,009 Thanks: 61 Thanked 701 Times in 455 Posts	Smell? Get the furnace human to do a tune up. Cycling a lot? See above AND it's been very cold out. Also... Make sure nothing is open to the outside such as an unlocked double hung window with an upper sash that has dropped a bit. If you have a whole house fan that is open to the attic it must be covered from above. Are any cellar windows opened a crack? Filter? Make note of the direction the air travels. You'll want to install the new one the right way. The filter has its size in inches on its edge. For example it might be 20"x20"x1". Filters come in varying capability. The hardware store, big box or small, will have guidance on that so you may pick your level of paranoia.