# Dark roof/light roof... heating/cooling...Best of both worlds!

**URL:** https://boards.straightdope.com/t/dark-roof-light-roof-heating-cooling-best-of-both-worlds/535503
**Category:** Cecil's Columns/Staff Reports
**Created:** [April 9, 2010, 8:15am UTC](https://boards.straightdope.com/t/dark-roof-light-roof-heating-cooling-best-of-both-worlds/535503 "2010-04-09T08:15:53Z")
**Posts on this page:** 1
**Page:** 3

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### Author: ![gazpacho](https://avatars.discourse-cdn.com/v4/letter/g/6f9a4e/32.png) [@gazpacho](https://boards.straightdope.com/u/gazpacho)
#### Post date: [April 22, 2010, 6:12pm UTC](https://boards.straightdope.com/t/dark-roof-light-roof-heating-cooling-best-of-both-worlds/535503/41 "2010-04-22T18:12:19Z")

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> [@Lute Skywatcher](#):
>
> Never mind attics and roofs, I recently read about some new interior panels being developed. They look like standard drywall but have a wax core; put them on your studs and paint them as you would drywall. As the room’s temperature rises, the wax turns to liquid and absorbs the heat, cooling the room.

Back in the 70s may dad got some phase change panels like that. The intention of those were that you put them where the sun would heat them up. Then at night when the wax turned from liquid to solid the panels would be at around 70 degrees keeping the room warm.

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