Still think climate change is a hoax?

[Dartz]

It's a phone call I've had to answer before - "Help, my heating is running away, my house is saying it's 28 degrees inside"...

No, that's the sun. Your heating switches off automatically at 20.

It's actually become a real problem - even under normal conditions houses are incredibly warm to the point where some form of comfort-cooling might be required. There is often a central ventilation system to get to the airtightness required but warm air/cool air systems don't really exist. As a matter of fact, the building regs are written in a way that forces you down a very specific design path that is not always the right thing. But cooling also takes energy - and while it is possible to do some work with heat-driven absorbtion chillers, the real reason cooling is hideously expensive is the humidity. Once you get the air to 100% relative humidity you have to pull enough heat out of it to start condensing all that water and that takes a lot more energy than simple cooling.