ᐅ Inside the house is 10°C warmer than outside – how is that possible?
Created on: 5 Jun 2021 17:44
K
kati1337
Hello!
We are beginners at living in a newly built house, and this first spring is raising some questions.
Our heating system (Tecalor THZ 504) has already decided, based on the outside temperature—which is currently around 20°C (68°F)—that it is in summer mode. In other words, the heating is turned off.
The system information still shows the flow temperature at just under 30°C (86°F), but the flow rate has dropped to zero.
The ventilation is still running, and I suspect our heat recovery unit is causing the issue—because what’s the point of exchanging indoor air with outside air if it blows the air back inside at almost the same warm temperature as it took out?
We only have an outdoor temperature sensor. The device doesn’t handle the indoor temperature very well. It claims the current indoor temperature is 20°C (68°F), but it seems to detect (through measuring) that the exhaust air temperature is about 28°C (82°F). This matches what our various thermometers around the house show.
The question remains: why do we have 28°C (82°F) inside at all? Where is the heat coming from?
Could it be caused solely by sunlight coming through the windows?
We have air conditioning, but I’d rather not run it yet when it’s only about 20°C (68°F) outside and raining.
How do you other new build owners handle this issue? Do you use shading? Something else? Or do you not have this problem at all and maybe there is something wrong with our building services?
We are beginners at living in a newly built house, and this first spring is raising some questions.
Our heating system (Tecalor THZ 504) has already decided, based on the outside temperature—which is currently around 20°C (68°F)—that it is in summer mode. In other words, the heating is turned off.
The system information still shows the flow temperature at just under 30°C (86°F), but the flow rate has dropped to zero.
The ventilation is still running, and I suspect our heat recovery unit is causing the issue—because what’s the point of exchanging indoor air with outside air if it blows the air back inside at almost the same warm temperature as it took out?
We only have an outdoor temperature sensor. The device doesn’t handle the indoor temperature very well. It claims the current indoor temperature is 20°C (68°F), but it seems to detect (through measuring) that the exhaust air temperature is about 28°C (82°F). This matches what our various thermometers around the house show.
The question remains: why do we have 28°C (82°F) inside at all? Where is the heat coming from?
Could it be caused solely by sunlight coming through the windows?
We have air conditioning, but I’d rather not run it yet when it’s only about 20°C (68°F) outside and raining.
How do you other new build owners handle this issue? Do you use shading? Something else? Or do you not have this problem at all and maybe there is something wrong with our building services?
KingJulien6 Jun 2021 12:23T_im_Norden schrieb:
And what is the point of that?This is about passive cooling. The different passive cooling programs are all activated and deactivated based on hysteresis and the delta T between outside and inside temperatures—or the room setpoint if no sensor is available. So, if Kati wants to use passive cooling, she also needs to adjust the room setpoint accordingly.
Alternatively, she can leave everything as is and first try shading, manual ventilation, and keeping windows and doors closed during heat.
That alone already covers more than half the effort.
kati1337 schrieb:
The question remains: Why do we even have 28°C (82°F) inside the house?Where is the house located? Something doesn’t quite add up here. For some, the heating was still on until two weeks ago (also in new builds, due to the ventilation system), and here it’s already 28°C (82°F) inside the place.
What kind of “high-tech houses” do you have? 🙄
Why should anything not fit? It's a modern house. This is how they are now; it’s not an isolated case. As soon as the first rays of sunshine appear and there is little or no shading, you will have corresponding temperatures inside.
There are also pages of complaints here in the forum from new homeowners, along with advice from long-term residents and those familiar with the issue.
There are also pages of complaints here in the forum from new homeowners, along with advice from long-term residents and those familiar with the issue.
H
hampshire6 Jun 2021 12:53kati1337 schrieb:
The question remains: Why do we even have 28°C (82°F) inside the house?Take a plastic container, put a thermometer inside, seal it, and place it in the sun. Your house is similar to that container: airtight and, unlike the container, highly insulated. Heat enters through the windows and cannot escape. This creates a heat buildup. 28°C (82°F) is actually not that high for a sealed, airtight house with large, unshaded window surfaces. If we didn’t have the natural cooling effect from the surrounding forest, we would need more shading than the 60cm (24 inches) roof overhang.hampshire schrieb:
If we didn’t have the natural cooling from the forest, we would need more shading than the 60cm (24 inches) roof overhang.Exactly, this should all be planned for in the new houses. It seems that primarily only the "winter" (heating) is taken into account, while the "summer" (shading/cooling) is ignored. 🙄T
T_im_Norden6 Jun 2021 15:05Passive cooling is activated when the outside temperature is 3 K (5.4°F) higher than the target indoor temperature for 2 hours and starts when it is 3 K (5.4°F) lower for 2 hours.
In my opinion, the setting of 20°C (68°F) fits quite well.
@kati1337
Try turning on the passive cooling.
In my opinion, the setting of 20°C (68°F) fits quite well.
@kati1337
Try turning on the passive cooling.
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