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Does the House Suck or Blow
That may seem like a rude title to some, but it does describe what goes on in a home naturally. Air moves in and out of a home constantly. The movement of air is driven by mechanical devices such as fans or furnaces or naturally occurring phenomenon such as thermal convection.
Some air infiltration into the home is a good thing, but as Newton said for every action there is an equal and opposite reaction. So what comes in must push some thing out. You can't dispute physics.
What's undesirable is too much air infiltration. The air that makes its way into the home is unconditioned which then causes a more rapid cooling or warming of the interior. That of course triggers the heating or cooling system to operate more often and that means more money spent by the home owner to be comfortable.
The other side effect of excessive air infiltration is discomfort from drafts. Drafts are one of the most common complaints of home owners with regard to energy efficiency and over all comfort.
These two photos show what is in my experience extreme air ex-filtration into the attic of this home. Notice the dirt on the insulation around ... more

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