Air-to-water heat pump - Nest Thermostat

Why no controlled residential ventilation? Just out of interest?

We are building in a village with 5 houses, of which 3 are large farms with livestock operations; the smell is sometimes very strong during the day and odor particle filters are too weak (we informed ourselves a lot with the appropriate experts). So I would be blowing the barn into the house every day. Why are we building there? Because one of these farms is the parental business. I don't know it any other way. I have nothing against controlled residential ventilation.... I would have installed it myself. But it would only run at night for us.

We are building in a village of 5 houses, of which 3 are large farms with livestock operations, the smell is sometimes very strong during the day and odor particle filters are too weak (we have researched a lot with relevant experts). So I would be blowing the barn into the house every day. Why are we building there? Because one of these farms is the parental business. I know it no other way. I have nothing against controlled residential ventilation... I would have installed it myself as well. But it would only run at night for us.

Then you don’t open windows during the day to ventilate either? I imagine it would smell quite musty in the summer.

Yes, yes. It is very complicated for us... the stable windows are open at intervals. Only locals like us know the exact time a window opens. Apart from that, I don't open my window during the day in summer at 35°.

We also do not have controlled residential ventilation and can control the temperature quite well with the ERR.

I can adjust the temperature in the children's room early in the day depending on the weather. By the afternoon, the temperature is set accordingly. It is clear that the weather can sometimes ruin your plans.
However, we are not heating up fully but rather adjusting the difference between the comfortable temperature during the day of 20° and a slightly lower temperature of about 18°, which is also quite pleasant at night.

I still haven't understood why I absolutely have to heat my guest room to 20° now if I only need it at 20° a few times a year? Someone has to explain that to me.

You are under the mistaken impression that it costs you a lot of energy - due to the self-regulation effect, it is actually cheaper than partitioning the room and thereby including the other rooms. Above all, it always sounds so dramatic - as if a power plant is starting up.

Hello D´ Artagnon,

I still haven’t understood why I absolutely have to heat my guest room to 20°C when I only need it at 20°C a few times a year? Someone has to explain that to me.

Maybe I can explain that as a practitioner

Imagine a pot of water on your stove that you want to keep warm constantly. For that, it’s enough to let the water boil once and then set the temperature so that the water simmers continuously. The energy costs are manageable and economical because only the desired temperature (simmering) needs to be maintained. If, on the other hand, you let the water cool down first, you have to supply energy again to bring the water to a boil. Repeated over and over, this becomes an expensive matter.

It’s similar with heated rooms; the constant change in temperatures requires more energy because, on one hand, the neighboring rooms will balance out the temperature difference, and on the other hand, deliberately heating up a room requires significantly more energy than keeping it constant at the same temperature.

Practical example from my own experience: years ago we lived in the ground-floor apartment in a two-family house, and I was always annoyed (I always prepared the utility bills for the house) that I was heating the upstairs apartment as well. The tenant of the attic apartment benefited not only from rising heat but also from the fact that we liked it nice and warm. So she constantly had to pay significantly less money for heating than we did.

At that time, I started building up a distribution business for radiant heaters and learned a lot about heat demand calculations, building substances, and their "organization" of heat. Also, about the nonsense night setbacks (ultimately nothing else than letting the pot of water cool down) of the heat generator entail (heating up the cooled-down pot of water in the morning). So I spoke with our landlord, explained the physical (I) processes to him, and finally got his approval to switch off the night setback. From then on, it was over that the ground-floor apartment paid for the attic apartment’s heat. Of course, the annual consumption values were not close together, but close enough for the two bills to be accepted as “usual.”

This experience still leads me today to urgently advise every builder never to change a system once it has been set. It is precisely the playing around with systems (here the heat generator or the pot of water) that causes costs that are unnecessary, like a lump.

Rhine greetings