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

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 16:16

#523

In our bathroom, it would also be very cold; it has been raining continuously for two weeks here (RLP). At night, the temperature is 7-8°C (45-46°F).
The heating is on and provides a gentle warmth.

Musketier2 Oct 2020 16:27

#524

Actually, Bookstar should turn on the heating, and the energy would be distributed to the other rooms through the self-regulating effect. Then his wife could turn off the heating element in the bathroom again.

blackm882 Oct 2020 19:50

#525

We have been heating since October 1st, but my wife gradually found it too cold. However, without a heat pump since early April, it is probably not too bad in my latitude and altitude.

Zaba123 Oct 2020 07:32

#526

chewbacca123 schrieb:

Our bathroom would also be very cold; it has been raining continuously here for two weeks (RLP). At night, temperatures are 7-8°C (45-46°F).
The heating is running and provides a gentle warmth.

After watching 35 kWh (35 kWh) being wasted daily last year (including charging the electric car), I’m now convinced not to turn on the heating so early in the year. The heating season is just too long (until mid to late March).

Outside, three-star beech wood is waiting, the car mostly charges at work, and the battery storage is just barely getting us through the night.

We’ll see how long we can manage without underfloor heating. The worst days are those without sun because the rooms don’t warm up during the day.

chewbacca1233 Oct 2020 07:52

#527

Zaba12 schrieb:

Let’s see how long we can manage without underfloor heating. The most unpleasant days are those without sun because the rooms don’t warm up during the day.

Being economical is good, but not at the expense of quality of life. If it gets too cold for us, or if we spend the whole day wondering whether it’s too cold, we turn on the heating.
Have you considered a photovoltaic system with energy storage? Despite bad weather, it currently covers almost all of our daytime electricity needs.

OWLer3 Oct 2020 08:38

#528

Zaba12 schrieb:

Let’s see how long we can manage without underfloor heating. The worst days are definitely the ones without sun because the rooms don’t get warmed up during the day.

I also have a colleague who only turns on the heating when his wife seriously threatens him with divorce. To each their own hobby...

If my relationship with my in-laws ever turns bad, that would be the easiest way to keep them away. My father-in-law has even left his own slippers here because he’s always cold in our house – even when the heating is on.

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

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