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 "heatpu

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.