Electricity consumption at home, what is your consumption?

Hi,

I have about 2200 kWh consumption per year, but I generate half of that myself.

Everyone complains about construction prices and that no house can be built for 200K€ anymore, but they also don't want to do without amenities (fireplace, electric shutters, controlled residential ventilation). Of course, these amenities also need space, so the house has to become a few square meters larger. Every additional euro spent pays off over the entire term, extends it accordingly, and worsens the loan-to-value ratio and thus possibly the interest rate. In addition, the risk increases after the fixed interest period, so people prefer 20 or 30 years instead of 15 years, which also raises the interest rates. In total, this quickly turns 10K€ into significantly more over the years. It may be that the effects at interest rates of 0.x% are significantly lower than before at 4 or 5%. But the controlled residential ventilation is just one point among many.

uh who is coming here with pub talk? It's those who not only consider controlled residential ventilation a luxury but absolutely unnecessary.
- how was that with the maintenance contract
- consumes more energy than it saves
- birds chirping in the morning - mine are so loud that I hear them through the closed window. The crowd that is just feasting on my hair.

Damn I forgot to check how much energy we need at night

the new energy saving regulation has been supposed to come for such a long time. In the end, you moved in before it comes into effect. This game has been going on for a few years. For us, it was said from 1.1.2019

uh who is coming here with pub talk? Those are the ones who not only consider a controlled residential ventilation system a luxury, but absolutely unnecessary. - what was it about the maintenance contract - consumes more energy than it saves - birds chirp in the morning - mine are so loud that I hear them through the closed window. The gang that's currently eating my hair off.

Damn I forgot to check how much energy we need at night

the new energy saving regulation has been expected for so long. In the end, you will have moved in before it comes into effect. This game has been going on for a few years. For us it was supposed to start from 1.1.2019

And which people are those? I exclude myself there, since I have already written xx times that it is nice to have...

I'll let myself be surprised. I think the work contract will be signed at the end of 2020/beginning of 2021. Let's see what is known until then

2x vacuum robots (each floor) - 1x garden mowing robot - having household help (earns less than 30€/hour) If you have at least this, then your calculation is approximately correct.

No, probably not with us. You don't always have to argue with a hammer. These 3 things are not worth it or don't work for us. However, you do actually have the advantage of the manageable bungalow.

I keep saying that controlled residential ventilation is a luxury and not a must have, but I keep getting attacked here and people try to convert me.

No, but there are arguments that need to be mentioned.

If you are currently in a living situation where you are satisfied without controlled residential ventilation and with ventilation, why should it be different in the new house?

There are older houses where the problem of forced ventilation does not occur at all. It is not about the birdsong or the smell of freshly cut hay. For me, controlled residential ventilation really belongs to the heating unit. As I said: with us, as far as possible, the heat stays in the house. If I open the patio door, I also go outside and can close it behind me.

So that the house cools down massively during ventilation lasting 5-10 minutes is nonsense. The air is exchanged, and it has a very low heat capacity. After all, it is a gas and the total mass is therefore low, ergo only a little heat is transferred outside. The majority of the heat is stored inside the house itself, in the walls, in the floor. That is why it is as warm again shortly after ventilation as it was before.

I have now looked up a few values for a rough calculation:

Air density approx. 1.2kg/m³
Specific heat capacity 1kJ/(kg*K) (at isobaric state change, i.e. pressure remains constant).
My house has, I believe, about 300m³ of enclosed space. So 360kg of air. So if I lower the temperature by 10K (10°C) during ventilation and exchange all the air, that is 3600kJ. And that is exactly 1kWh. Per ventilation, of course. And I ventilate twice a day.

These are extreme values. Only for the smallest part of the year is it so cold outside that I really reach the 10°C temperature difference. On average, one is certainly still below half of that.

The controlled residential ventilation is therefore probably rather a replacement for permanently "tilting the window open." And that is exactly how its advantages are described by the proponents.
One question, I don’t really have one: would the controlled residential ventilation possibly also dehumidify the air? In summer there are always days when the outside humidity is so high, and inside it is correspondingly high, so I would have concerns about the moisture in the long run. Only you can’t do much about that by ventilating.