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.
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.
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boxandroof4 Dec 2019 15:49This is how it is for now. Many south-facing windows, shutters.
Haydee’s idea to open the windows in winter is probably the best one so far.
Summer will be more difficult...
Haydee’s idea to open the windows in winter is probably the best one so far.
Summer will be more difficult...
chewbacca1234 Dec 2019 16:08haydee schrieb:
Opening windows is also possible with mechanical ventilation. We have a passive house, and I still open the windows on sunny days.
Regarding the south-facing orientation after almost 2 years: south-facing windows are great, but the terrace doesn’t necessarily have to face directly south. Yes, we love the view; we have a wonderful outlook over green areas and some hills. That’s why it would be a shame to darken everything every time the sun shines.
Starting tomorrow, when it’s sunny, we will open the windows and observe how the indoor climate behaves, especially in the living area.
chewbacca1234 Dec 2019 16:10Bookstar schrieb:
We have the same heating system; the settings are quite straightforward. If you have any questions, feel free to ask.
Venetian blinds aren’t great for summer either; the only real solution is a solid roof covering. Otherwise, you’re sitting behind bars... Okay, I think I will come back to that directly. I would like to understand how to analyze the heating curve. How can I tell if our heating is properly adjusted and heating the rooms optimally? For a new build, would you recommend heating all rooms by default? Currently, we only heat the rooms we use. Thanks.
Of course, you need to heat all the rooms. You no longer have radiators but a modern low-temperature underfloor heating system, which operates more efficiently and economically if you maintain a constant temperature. Otherwise, the neighboring heated rooms will warm the unheated ones, and in the end, you gain nothing. After all, everything is within the heated building envelope.
Winniefred4 Dec 2019 16:47This is a common issue for anyone with modern houses featuring huge windows – in summer, it becomes even more pressing. I personally find the idea of an awning quite appealing; it blocks enough sunlight while still allowing light to enter, without significantly reducing the outside view. But doesn’t it deteriorate quickly if you use it during the winter as well?
Other than that, I don’t have much to add. We have an older house and, fortunately, no windows facing south. In our living room, the east-facing windows provide enough heat buildup—just enough to keep it comfortable.
Other than that, I don’t have much to add. We have an older house and, fortunately, no windows facing south. In our living room, the east-facing windows provide enough heat buildup—just enough to keep it comfortable.
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