ᐅ Room Thermostats for Heating and Cooling

Sorry, the other way around. When heating, cold air is drawn in and even colder air is blown out. When cooling, warm air is drawn in and even warmer air is blown out.

daniels87 schrieb:
Exactly. An air conditioner is also a heat pump.

Yes, but with a different level of performance.
The effect of an air-to-water heat pump is not even close to comparable. That is probably why there is that note about the sales pitch ...

The cooling capacity is usually almost as high as the heating capacity in a heat pump with active cooling. The insulation to the outside works both in winter and summer. In winter, a temperature difference of 32-36 degrees needs to be maintained (20°C (68°F) indoors and down to -16°C (3°F) outdoors). In summer, the difference is typically smaller, as only a few degrees need to be cooled (around 23°C (73°F), so a maximum difference of about 12 degrees from the 30-35°C (86-95°F) outside temperature). The capacity should be sufficient. Of course, relying solely on cooling via underfloor heating may not be optimal in terms of heat/cold distribution, but it should work.

The original poster is only asking about the control – is it simply set on the heat pump and done? Apparently, they have installed “wrong” room thermostats, but I don’t think that should cause a problem. Can all room thermostats be set to maximum and then the heat pump switched to cooling mode instead of heating?

The difference is that in heating mode, "warm" outside air is drawn in by a powerful fan as the heat source. The heat is then transferred by a compressor to water that flows through the underfloor heating system.

How do you transfer heat from the indoor air to the water in the underfloor heating system during cooling mode, so that the air-to-water heat pump can operate in reverse and transfer the heat from the water to the outside air? Yes, it’s possible, but the effect is rather... well.

With a brine-to-water heat pump or groundwater heat pump, it’s different because in summer the brine or groundwater is cooler than the indoor air, which you want to cool down. But then there are other factors like dew point control, etc., so there’s quite a bit involved. I’m currently looking into this as well 🙂

@Grym:
That's what I thought as well. The temperature should be adjustable via the flow temperature.

Alex, this works perfectly with an air-to-water heat pump. It is called active cooling and provides more than just passive cooling through ground source.