Is it possible to retrofit air conditioning if controlled residential ventilation is available?

So the bedrooms have about 20sqm and a ceiling height of 2.73m. The area on the [EG] is about 55sqm and a ceiling height of 2.63m. The figures are from the documents of the building application.

I have great understanding for your project and explicitly do NOT criticize the installation of an air conditioning system with the following words.

How stupid are actually our building regulations for energy saving, if they focus almost exclusively on heat loss in the cold seasons and hardly on heat dissipation in the warm months? The energy saved in winter is consumed in summer for additional air conditioning, because the houses can no longer be cooled once the heat is inside. Isn't there a smarter way to approach this already from the regulations?

The numbers are from the documents of the building application.

Aha, so you don't even know if that's true at all. :cool: I wonder how it can even get (too) warm in your place. The upper floor only has windows on the gable ends (W/E). The south side has an overhang. Are the awnings at least hanging now and then? ;) Even if you have to use them more as rain protection this „summer“.

I wonder how it can even get (too) warm in your place. The upper floor only has windows on the front sides (E/W). The south side has an overhang.

Possible factors: Factor A: The roof insulation is "warmed through" after x sunny days. Factor B: In everyday living, some windows are often open for a long time and the entering heat accumulates up top in the bedrooms. Factor C: The east and west windows are not shaded when the sun is shining. Radiant heat penetrates unhindered and cannot escape well due to good insulation. It would probably not be a bad idea to channel supply and exhaust air for a controlled residential ventilation system through piping underground – then the supply air could be naturally precooked without energy expenditure.

So the bedrooms are about 20 sqm and have a ceiling height of 2.73 m. The area on the ground floor is about 55 sqm with a ceiling height of 2.63 m.
The numbers are from the building permit documents.

How does the heat get into the house? Do you have large windows, etc.?
For a few warm days like this year, it should be sufficient to close the bedroom windows tightly in advance with shutters and the like.

How stupid are actually our building regulations for energy saving, if they focus almost solely on heat loss in the cold seasons and hardly on heat removal in the warm months? The energy saved in winter is used in summer for additional air conditioning, because once the heat is inside, you can no longer cool the houses. Isn’t there a smarter way to start from the regulations?

My point all along.... but.... The biggest problem nowadays is the lack of mass in houses, not just the half-hearted shading. Well, and then the assumption: "The house is insulated anyway." With most people, the brain clearly switches off here.

It probably wouldn’t be dumb to lead supply and exhaust air to a controlled residential ventilation system through piping in the ground – then you could pre-cool the supply air naturally and without energy expenditure.

But that often causes hygiene problems and that is rather suboptimal Experience: with today’s building style, a 3.5 kW unit should be sufficient for your living area, and in the bedrooms the smallest available, ideally the 2.0 kW ones