this post was submitted on 22 Jun 2026
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That would be my guess, the crawl space is cooler to begin with because there's not enough insulation from the crawlspace and the rest of the house. So the cool air from your crawl space and home is now being sucked into the attic.
Your attic is supposed to be hot, that's why you have so much insulation between your house and the attic, and not the roof and the attic. It's supposed to be closed off from the rest of the climate control.
Old houses were not designed for insulated attics. But, along with attic insulation, the attic and roof needs to be vented, to let the hot air escape. Ideally a ridge vent across the entire roof.
There is a ridge vent
The ridge vent gives the hot air some place to escape that is not your living space. Creating a draft from your living space to your attic is just going to pull your cool air into the attic.
It's from the crawlspace under my house, not a living space at all
Still might be a problem, especially if you don't have great insulation under your subflooring. You're pushing cool air from under your house to the attic. That vacuum of cold air is either going to be replaced by cooler air pulled from your house if you don't have enough insulation, or from the hot air outside.
Pulling in hot air from outside is going to make your AC work harder because that hot air will rise and warm your house. And pulling colder air from your house into the crawl space means your AC is now working harder to cool your house, your crawl space, and your attic.
The space in your attic and your crawlspace are supposed to act as insulated buffer cells between your living space and outside. Connecting the two basically creates a vacuum that vents cool air from the ground to the vent in your roof.
Plus.... Depending on how old your home is, you may unintentionally be pumping a dangerous amount of radon into your attic.