Construction costs are currently skyrocketing

I still see people installing controlled residential ventilation systems without [Entapialwarmetauscher]. Please don't do that, in winter it becomes too dry.

I still see people installing controlled residential ventilation systems without enthalpy heat exchangers. Please don't do that, in winter it gets too dry.

Our general contractor is planning a Stiebel Eltron LWZ 5. I don't see anything about an enthalpy heat exchanger, only "inverter technology." Is that the same thing?

Our main contractor is planning a Stiebel Eltron LWZ 5. I don't read anything about an enthalpy heat exchanger, only about "inverter technology". Is that the same?

Dr. Google says no.

Enthalpy heat exchangers, in addition to the heat recovery provided from the measured heat, also ensure a balanced indoor climate through the retained moisture.

Fifty years ago, "Allraum" was simply not in fashion,

The 60s really launched oversized living rooms with panoramic windows on a large scale. Of course, a lot of work needs to be done in terms of energy efficiency. …

The 60s did indeed release oversized living rooms with panoramic windows on a really large scale. Of course, energetically, a lot needs to be done there. …

Yes, I also remember really large, open fireplaces and large-format marble tiles.

Would exist

I built my controlled residential ventilation system myself back then. It was a Helios controlled residential ventilation EC 500 ET. Included 125mm spiral ducting (insulated with mineral wool and Armaflex at problematic spots) with 125mm supply and exhaust vents including silencers and throttle valves (motorized) in front of each supply and exhaust vent.
Costs were around 4k€ (because I could buy at equity prices, normally it would have probably been 6-7k€)

To my knowledge, there are only 2 major manufacturers for controlled residential ventilation. The rest is labeled.
I paid 5k for the material, and another 700 for customer service including adjustment and calculation.
Approx. 250m2, 2 residential units. Built in 2021.
11 rooms, 14 plates, 7 exhaust, 7 supply.
Central controlled residential ventilation with cross heat exchanger and enthalpy, ventilation volume (nominal value) 230m3.
Setup was EL