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What are some weird heat reuse applications that nobody is talking about but that you wish they were (or that you secretly think are viable)?

Love what my friend Softwarm LLC is doing up in Idaho. He's got a semi-truck wash (hot water used to get off road grime).

I think those kinds of applications where hot air or water is used as part of the daily operations, not just when it's cold - are the obvious low hanging fruit.

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