ᐅ Underfloor heating with an air-to-water heat pump. House gets too warm when the sun is shining.

Created on: 4 Dec 2019 14:18
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chewbacca123
Hello everyone,

I have a general question.

We moved into our new build four months ago. The living area on the ground floor has three large floor-to-ceiling windows facing south. We have underfloor heating and an air-to-water heat pump.
It provides a really comfortable temperature inside the house, but we have a problem – whenever the sun is shining in winter, even if it’s -2°C (28°F) outside, the temperature suddenly rises to 24°C (75°F) in the living room. It gets uncomfortably warm in here, and the underfloor heating can’t be turned down quickly.
Should we assume that the large floor-to-ceiling windows are responsible for the heat gain? A photo of the south-facing side of the house is attached.
What would you do – always lower all the blinds as soon as sunlight is forecast? That seems quite annoying...
We have motorized blinds controlled by Somfy. Would you consider buying a sensor that automatically lowers the blinds at a certain temperature?

Thanks in advance for your replies.

Neues zweistöckiges Haus auf Baustelle mit weißer Blockfassade, pinker Dämmung und großen Fenstern
chewbacca1232 Oct 2020 08:29
Quick update –
The last 48 hours and 11 starts of the heat pump since closing the final inspection (stage 5.5 of 6).

Previously, there were 40 starts!
chewbacca1232 Oct 2020 08:31
Alessandro schrieb:

I currently have the following settings for the heating curve:

HK.jpg


Here is the heating curve of the mixing valve:

HK_Mischer.jpg


I haven’t done a hydraulic balancing yet.
The heating limit is set to 14°C (57°F) and for the mixing valve to 18°C (64°F).
Do both heating curves need to have the same values?

Those are quite high values!
B
Bookstar
2 Oct 2020 12:39
Tell me, are you really already heating? Our heating has only been running for about 4 hours in one week...
H
halmi
2 Oct 2020 12:45
@Bockstar, was your stove not on either?

We have already had a light frost once at -1°C (30°F) and several nights with temperatures below 5°C (41°F). However, we also prefer it to be warmer inside the house.
Musketier2 Oct 2020 12:54
His wife secretly set the heating cartridge of the towel radiator to continuous operation. The main thing is that the heating energy meter doesn’t run.
Tolentino2 Oct 2020 13:22
We are not heating yet in the condominium, but it is slowly getting chilly. And I can't find my slippers.
The dog has probably eaten them.