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You're wasting money on heating! Use your A/C! | Tech Ingredients
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I figured since this wasn't actually showing you how to convert an A/C system to be used as a heater in a practical way, and was just a demonstration of the principle/capability, c/DIY didn't quite fit.
But I think you're right, c/technology would be a good fit, and I'll likely crosspost it over there in a day or two unless someone else gets to it first ^^