ᐅ House electricity consumption – what is your usage?

They’re mostly just witnesses to fresh air.
Or mold phobics.
Or comfort connoisseurs.

Ybias78 schrieb:

Well, at least you got us thinking. Since we are skipping cooling via underfloor heating (€3,800), we are now considering installing a mechanical ventilation system with heat recovery. At around €12,000 – with 35% funding support, it’s not a significant additional expense.

Then do it properly and plan for an earth tube ventilation system. This will preheat the air in winter and cool it in summer.

halmi schrieb:

The CO2 price was increased by the Bundestag yesterday for 2021, from €10 to €25 per ton.

As far as I know, this is the first time a CO2 price is being introduced. But instead of starting at €10, it will be €25 right away, contrary to the original agreement by the grand coalition. This has actually been decided since 2019.
For a house with gas heating, that means an additional 0.6 cents per kWh. Depending on the current energy price, this results in a 10–15% increase in costs. And this is just the beginning. In five years, nobody will be installing gas heating in new buildings if this trend continues.

Mycraft schrieb:

Every time I enter a new build, you can immediately tell whether the house has a ventilation system or if the occupants properly ventilate manually.

To get ahead of that: this cannot be prevented even with “breathable” building materials.

Ybias78 schrieb:

Well, at least you’ve made us think. Since we are skipping cooling through underfloor heating (€3,800 (about $4,200)), we are considering installing a controlled residential ventilation system. At around €12,000 (about $13,300) minus 35% subsidies, it’s not a big extra expense.

Even though I personally prefer a central system, which falls in the mentioned price range, it doesn’t necessarily have to be the “top tier” option. Much cheaper options include trickle vents in window frames combined with a few exhaust fans. That would be my absolute minimum requirement. Above that, there are also decentralized units with heat recovery.

Everyone I know with decentralized units always keeps them turned off. So, it's a waste of money. Either nothing or central.

There have occasionally been homeowners who complained about the sound transmission in houses combined with decentralized ventilation systems. Others, like @Nordlys, are satisfied with window reveal ventilation and decentralized ventilation in the bathroom.
My opinion on controlled residential ventilation: all or nothing.

Joedreck schrieb:

Then do it properly and plan for an air well. This will preheat the air in winter and cool it in summer.

There is something on this topic: a controlled residential ventilation system with heat recovery is supposed to work best without any additional earth tubes or air wells.
There is an Austrian forum, and in the "roten Forum" Leitwolf is active, who has thoroughly dealt with this topic.