Why is shading particularly important in newly built houses?

Night cooling is the activated bypass where heat recovery is deactivated. Activating the heat exchanger during the day is called "passive cooling" or "heat protection" by some. Indoors, the air is cooler than outside. When both then pass through the heat exchanger, the outside air transfers its energy to the exhaust air. In some cases, even warmer air went outside than was already outside.

In our case, it was usually such that the supply air was at most 1-2K warmer than the exhaust air, even if it was 10K warmer outside, so the warming is significantly slowed down.

However, one must ensure that the controlled residential ventilation system can do this. Ours actually could not, because it only has a siphon. Condensate could form on the supply air side as a result, some controlled residential ventilation systems only have a condensate drain on the exhaust air side. But since we have an enthalpy exchanger and the differences are not too high and I will set up a moisture protection, we do it anyway.

I had to remove a plug for this function, and this must also be explicitly confirmed in the program with a calculation example.

Then the condensate flows through this hole into the exhaust air area, where the siphon is located.

Which controlled residential ventilation system do you have?

Helios Controlled Residential Ventilation EC 500 W ET

I thought so. The 500 has it, the 300 too, but 270 and 370 don’t. And now guess which ones we have .

Great – you only realize such subtleties later on. Also, that our controlled residential ventilation system does not have building inspection approval and we needed an individual permit... that took almost 4 months.

Or that the small company incorporates new functions into the series that cannot be retrofitted...