In a lower energy future, what sort of technologies are feasible for heating and cooling? Heating is pretty easy. You can turn down the termostat for like four or five degrees. Even in a very cold climate, you can actually survive just by insulating your body. And so that's kind of easy. The hard part is the cooling. That is where it gets complicated. Because you can also say, you cool people instead of spaces. I mean, i have it here now under my desk. But as you said, it stops working above a certain temperature, like 32 celsius. It kind of makes no sense any more,. didn't din't?

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