Heating via ventilation with heat pump

Also, Viebrockhaus probably hasn’t invented the perpetual motion machine yet. Heat recovery is always associated with losses, where does the rest come from? Electrical appliances, occupants, solar gains – yeah! That only works in a passive house. Everyone else heats with electricity. Especially when another 2-3 kW are deducted for hot water. Even a passive house can hardly manage that.

As said: It is not about a fundamental discussion or effectiveness, but solely about the fact that there are exhaust air heat pumps as air-to-air and as air-to-water. When AWP are mentioned in new buildings, air-to-water is usually meant here.

All right. Then these are definitely to be seen as similar in investment to an air-water heat pump (with outdoor air), since underfloor heating and the like also apply. But why one would want to do that is even less clear to me Then you can also get the energy from outside.

It's logical, Alex. Is a house like that even healthy? It has to be hermetically sealed, preferably with taped-up windows, so no one ever ventilates. And a crawl door, so that if it's open, almost no evil cold nature flows in. Yuck, living in a house like that, I imagine it to be horror. Pale people, muscle-trained with muesli, crouch inside and strengthen their suffering with the words, yes, but we saved the world. It was worth it....[emoji28]

haha that's a good question. I think even a KFW house is already "hermetically" sealed in a layman's sense. The rest is just measurement work. But yes, passive houses planned according to PHPP place special emphasis on airtightness, heat loss through insulation and thermal bridges as well as passive energy supply like solar gains, residents, electrical appliances. The stuff is expensive mainly because of the paperwork, not because of the building materials or craftsmanship, in my opinion. Whether you would feel sick during unconscious stay in such a room, I dare to doubt. The few people I know with passive houses do not exactly resemble Gollum either, but get up at 5 o'clock and run around the lake. Idealists.

Oh? You sleep that badly in those things? Five o'clock, phew.