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Joined 2 years ago
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Cake day: June 13th, 2023

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  • An HRV tempers the incoming air with the air going out no matter the season. So, in winter, it recovers some heat from the exhaust air and exchanges it with the cold intake air, keeping heat inside.

    In the summer, it’s the opposite. The exhaust air cools the hot intake air, keeping the heat outside.

    It’s essentially always working for your benefit (except for one edge case that I can expand on if you’d like), always providing fresh air and exhausting stale air while helping to keep the interior temperature where desired.

    I’d recommend keeping it on all the time, no matter if you open windows or not.




  • A bicycle pump or other type of air pump warms up when the air is compressed.

    A spray can or propane cylinder cools off when the gas inside it is released.

    Plug the two together in a loop, put some coils on either side so that heat (or lack thereof) can be easily exchanged with the space, and you have a heat pump.

    A heat pump doesn’t generate heat, it just moves it using the physics of pressure and state changes of a fluid (refrigerant). Moving heat in this manner uses less electrical energy than would be used generating heat from that electricity.

    Heat pumps are very common. Refrigerators would be the most ubiquitous (heat pumped from inside to outside), but there are AC units, of course, and also clothes dryers and water heaters that are available.














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