Then you can turn up the heat.

Passivhaus designs usually integrate the heater with the ventilation system.

And over the tops of them is 3,000 to 4,000 meters of water creating enormous pressure, forcing water down through the cracks toward the center of the earth, until it hits a magma chamber where it becomes superheated and supersaturated with minerals, reverses its flow and starts shooting back to the surface and is ejected out of the earth like a geyser at Yellowstone.