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Re:How air-conditioning created the modern city by neor on Wednesday August 15, 2018 @04:18AM (#17764458)
Disclaimer; I live in a very moderate climate. So I don't know how this would scale to hotter cities.

My home is equiped with what would translate to a "heatpump". Its a system that uses the warmth deep in the earth to help heating up the home in the winter, but also cools it down in the summer storing excess heat in the well drilled underneath the home or garden.

What it does in summer is basically run cold water through the underfloor heating system.

We've had some very hot days for our climate recently (35 to 38 degrees centigrade, which is around 95 to 100 Fahrenheit) and the temperature inside remained steady at a comfortable 23 degrees centigrade (around 74 Fahrenheit).

The system uses a lot less energy than air conditioning.

Re:How air-conditioning created the modern city by EADGBE on Wednesday August 15, 2018 @09:34AM (#17765879)
This is a geothermal heat pump.

There are traditional outside air conditioner units that run in reverse which use heat in the air, as well.

Re:How air-conditioning created the modern city by jjeaff on Wednesday August 15, 2018 @06:17AM (#17764898)
How cold is the water used to cool the house? If the water temp fell below the dew point, you would have a condensation problem.