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How effective are passive cooling techniques? Which are the cost-effective and easy to use ones in your experience/awareness? (lemmy.ml)

submitted 1 week ago* (last edited 1 week ago) by 1Malayali@lemmy.ml to c/asklemmy@lemmy.ml

15 comments fedilink hide all child comments

Do things painting the roof white help to reduce the heat in a significant way? Have seen it being mentioned in videos on black vs white coloured cars.

Are there any drawbacks noted by people who tried it for roofs?
Or are there other options that are easier to start with?

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[–] artifex@piefed.zip 9 points 1 week ago (1 children)

I live in south Florida and replaced/resurfaced the asphalt parts of my roof with white PTO and silicone elastomer. It lowered power usage from AC by about 10% in the main zone and much more in a smaller zone where the AC ran constantly because it couldn’t maintain the temp (77F) with the black roof. That seems to be in line with current research but YMMV.

[–] vladmech@lemmy.world 3 points 1 week ago (1 children)

That’s a wild drop, I didn’t realize it would be that impactful!

[–] artifex@piefed.zip 4 points 1 week ago

Yep, tho it’s probably mostly because my house is old and poorly insulated.