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

chewbacca1236 Dec 2019 14:48

#49

boxandroof schrieb:

The supply temperature is set centrally by the heat pump using the configured heating curve and is not controlled by the thermostat. The thermostat may only restrict the flow, so the underfloor heating initially remains warm. Thermostats are generally not useful in new builds—but that is a separate topic.

Underfloor heating has very little effect on overheating caused by solar gain.

Hello, could you please take a look at the temperature? The supply temperature seems quite high, doesn’t it? See the picture.