ᐅ Control the climate using underfloor heating or through the ventilation system?

At least this way the thermal bridge is less severe because the path is longer. There are very small trap siphons that would definitely fit underneath there. Instead of a plug/trap, you could also consider a valve or something similar that allows water through but not air (such devices exist). I might consider the plug myself, as I also regularly change the filters of the controlled ventilation system myself.

ypg schrieb:

I hadn’t really considered an external air conditioning unit until this thread, ...

This summer, I did think about installing an air conditioner when even the nights stopped providing any cooling. You learn during construction how to keep heat inside the house. Unfortunately, that doesn’t help at all during summer.

However, I really dislike those external units. From what I have seen, they either require a hose through a window or a hole in the wall. I find both options rather... well, disappointing.

Are there any without an outdoor unit? I mean, from a quick search, I saw simple units for around 700 euros. Yes, and they looked quite nice, about 80cm (31 inches) wide and 20cm (8 inches) high... It’s just about light cooling for a few days in a modest bedroom. Spending 2000 and having a unit on the exterior wall is not an option for me.

Sure, monoblock units – you can get that junk at any hardware store.

They make a lot of noise, the hose has to go out the window, and they never actually reach the stated capacity.

You can find them for around 200 euros (about $215) – you can try it out and see if it works for you. Otherwise, just return it...

They are far from a well-functioning air conditioning system, but they do help with high temperatures.

Sebastian79 schrieb:
Sure, monoblock units – you can find that junk in any hardware store.

They make a lot of noise, the hose has to go out the window, and they never actually deliver the stated capacity.

You can get them for around 200 euros – you could try one out to see if it works for you. Otherwise, just return it...

Far from a well-functioning air conditioning system… but they do help with high temperatures.

Yes, I just checked again: they are monoblocks with a hose, quite loud, and power-hungry.
Maybe our old fan heater unit, which isn’t that old but comes from our previous house, could cool a bit. Using it for an hour before falling asleep and with a timer for a few hours during the short summer heatwave would be an option. But I’ll only try that if the need arises.

Phew, mentally saved some money again.

I haven’t read everything in detail.
This summer, we cooled our house using the heat pump through the underfloor heating system. Of course, you shouldn’t lower the temperature so much that condensation forms on the floor. On average, our indoor temperature was 3-4°C (5-7°F) cooler than the rest of the neighborhood. The downside is that you need to turn it on early enough, not only once the house has already become very warm. We only used it when the outdoor temperature had been at least 30°C (86°F) for several days.
We would definitely do it the same way again.