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Joined 15 days ago
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Cake day: July 9th, 2026

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  • CAN be very expensive. If you are doing it with a car radiator and a hose pipe it costs very little and there isn’t even a heat pump involved.

    You can take it up a step by using a heat pump of course. Which you can also do fairly cheaply if you are willing to modify a portable AC unit or tbh anything else with a heat pump in it. All you need to do is water cool the hot side of the heat pump and send that water through your ground loop.

    Depends how much you want out of it. Are you heating and cooling the entire house year round along with providing hot water. Or are you just taking a few degrees off the peak summer temperature in a room or two?


  • IIRC the latent heat of fusion of water is about 333kJ/kg. So 666kJ for 2L. With ice that averages out to about 23w over a nights sleep. Heat capacity of water is 4.2kJ/kg/k, so even if its 0c as a liquid, to warm up to body temperature is under 300kJ.

    TLDR: Water going from a ~0c solid to ~0c liquid takes more than twice as much energy as ~0c liquid water warning up to body temperature.

    The ice also only melts to 0c, so you get that benefit as well.













  • I have thought of this. Paying people less could work out alright if you bring down their living costs. Housing is most of that and a lot of that cost goes to profit for banks.

    Bring the cost of housing down and a lot of people will probably be happy to reduce hours worked. If you have a high unemployment rate there should be plenty of people to cover those extra hours too.