Building according to the Energy Saving Ordinance 2016 or KfW55

How is it in daily use? In-out-in-out... especially with children.

??? My children and I have never been obstructed by the controlled residential ventilation and prevented from in-out-in-out.

Works. The in and out is not so bad with us. In the village, many children are outdoor kids. If it does get warmer inside during the day, then at night you just have to additionally ventilate crosswise along with the controlled residential ventilation. Actually, we rather have the problem that it’s fresh on the ground floor in winter, because the sliding door is more open than in summer. It takes time for the walls to warm up. Just because there were a few hours of warm air in the house doesn’t mean suffering until winter. How well the air exchange works at night may also depend on the area. We don’t have dense buildings compared to some settlements, the greened slope behind the house, etc. Heat is a problem in our second home. 70s building and a sieve, whereas the new buildings are Tupperware boxes. I just wanted to point this out because people still come up to us, full of surprise, that indeed windows open here and may be opened except for cleaning. Insulation itself works. We have a thickly insulated attic, 2 small windows in the gable, not developed, unoccupied, unheated. Lowest temperature this winter 14 degrees, highest temperature last summer 23 degrees. Outside temperature from -20 degrees to +40 degrees.

Many interesting contributions and opinions. I am now tending to build as a KfW55 with decentralized ventilation, even if the energy consultant should calculate that ventilation would not be necessary.

Please inform yourself about the difference between centralized and decentralized controlled residential ventilation.

We have decided on KfW55. However, we are building without a ventilation system. You can also achieve the required efficiency through the masonry (in our case T8 brick), increased roof insulation, and a photovoltaic system. This has the advantage for us that the house does not have to be wrapped in plastic foil and no ventilation system is needed.

I would recommend you choose KfW55 in any case because the additional costs are completely covered by the subsidy and you do not have to accept any disadvantages. With higher standards, it may be that window areas etc. are no longer freely selectable (heat input).

That has the advantage for us that you don’t have to wrap the house in plastic foil and also don’t need a ventilation system.

can you explain what you mean by that?