ᐅ Warm bedroom in a house with ventilation including heat recovery

Created on: 21 Apr 2016 21:56
P
Payday
Hello,

we have a central ventilation system with heat recovery. In the bedroom, the heating is turned off, yet in the evening at 10 pm, the temperature is still 21°C (70°F) while it’s 10°C (50°F) outside. All windows are, of course, closed. There is one air outlet (air supply) in the bedroom. The shutters were closed during the day, so very little solar heat entered. Still, it always gets too warm in the evening. Could this be caused by the heat recovery ventilation system, which is supplying warmer air into the room than expected? What could be done about this? Lowering the temperature of the heat recovery system doesn’t seem to make sense, as that would defeat the whole purpose of the system. Slightly opening a window helps little if the shutters are open.

How have you solved this or what else could be causing it? The heating is definitely off, and the display on the distribution box also shows it as closed.

Overnight it gets even warmer because the resting heat from two people exceeds the heat loss to the outside.
Mycraft22 Apr 2016 11:21
As BeHaElJa already mentioned, the problem is not the ventilation system but the house itself... and in summer it actually gets worse... much worse, really... especially if you already find 21°C (70°F) uncomfortable.

Regarding the ventilation, I also recommend running it at the lowest setting during the night.
Musketier22 Apr 2016 11:52
I’m familiar with the complaining even without a ventilation system.
In our case, the doors are always left open somehow, but then there’s an issue when the bedroom and kids’ room get too warm. If I turn down the heating on the upper floor, of course the warm air from the basement rises to the upper floor.
The result: upper floor just as warm, basement cooler → more complaints.
f-pNo22 Apr 2016 12:39
Well – the recurring issue again.
This is something that is hardly controllable on your own.

Measures:
wearing lightweight pajamas or similar all year round
using the lightest blankets year-round
ventilating vigorously for 5 minutes before going to bed

Well – and if this doesn’t help: my wife likes to open the windows at night – much to my dismay (why waste energy).
I have programmed our heat pump so that it doesn’t operate between 10:00 PM and 7:00 AM. This way, we at least don’t heat unnecessarily when the window is open during sleeping hours. If the windows remain closed, there is no significant heat loss during this time due to the insulation (this would be more relevant in winter).
Mycraft22 Apr 2016 12:59
Nothing helped me except a split system... but we also have the bedroom facing south.
EveundGerd22 Apr 2016 21:17
We ventilate the whole house again late in the evening before going to bed. This usually lowers the temperature to around 19.6°C (67°F). In my opinion, that’s still a bit too warm for falling asleep, but we’re gradually getting used to it.
Since the heating season started, my men only sleep in T-shirts, while our teenage daughter still wears a long nightgown. We solved the draft problem by moving the bed slightly.
Just try out what works for you! There’s no one-size-fits-all solution here.
M
merlin83
22 Apr 2016 22:41
Mycraft schrieb:
Nothing helped for me except a split air conditioning system... but our bedroom is also on the south side

I also believe that spending 5,000 to 10,000 (currency not specified) for air conditioning in the living room and bedroom in a new build is very well invested. Just two summer days at 40°C (104°F) and the indoor temperatures become unbearable.