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tl;dr: heat pumps are widely used for swimming pools, can probably be used for hot tubs, and should work reasonably well in your climate. Swimming pool with cover I couldn't find good information on hot tubs, but I did find that the U.S. Department of Energy has this page on heat pump water heaters for swimming pools. Then, a quick search suggests that ...


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10 CFR 430.32 - Energy and water conservation standards and their effective dates is the U.S. government standard defining (among other things) how energy consumption of refrigerators is to be tested. The standard references the test procedure AHAM HRF-1-2008, developed by the Association of Home Appliance Manufacturers, an association which "is an ANSI ...


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This is simply a fancily designed chain of cities based on the about 40 years old idea of the "compact city". The idea is to reduce urban sprawl, reduce traffic and improve living conditions. Each link of the chain in itself will be not self-sufficient, but provide all necessary (daily) needs to its inhabitants, including doctors and if not a ...


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A properly made normal thermometer will function perfectly well in a refrigerator, as you describe. As with all mercury based thermometers be careful not to break it. Cleaning up and then dealing with the released mercury would be problematic. If that were to happen contact the waste disposal department of your local municipal council and get advise because ...


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A "city" implies people. Lots of people. Those people need to eat. Food generally is purchased at (super)markets and grocery stores. It usually is delivered by trucks. No roads means no trucks means no markets means no food means no people means no city. I see a teeny, tiny problem with the plan, don't you? Of course, one can transport and ...


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