If I open my attic hatch (roof/soffit vents, high attic, no insulation) & downstairs windows, will downstairs house with no AC be cooler?

Question

If I open my attic hatch (roof/soffit vents, high attic, no insulation) & downstairs windows, will downstairs house with no AC be cooler?

Asked by Jean Day

One-story Florida house built in 1941 with absolutely nothing in the attic. It seems to me that if I keep the attic hatch open and let the air recirculate for a few weeks (heat rises), the house downstairs might be cooler? Windows will be open downstairs. With the attic hatch closed all the time, doesn't the hot air stay in the house?

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Answers

Sean Lintow Sr's picture

In short - yes & no but most often it won't be cooler / help. Why - well because heat doesn't always rise. In fact during the summer months the process is reversed (hot moves to cold). For more: http://thehtrc.com/2012/building-science-stack-effect How can you have a cooler house - you can try a whole house fan & run that during the night for a while to help pull the heat out. You can always air seal & insulate. Finally you can open up a few windows on each side of the house & allow for cross ventilation to help.