Room temperature too high despite control, how to lower it?

Hello,

a similar thread has already been created regarding my problem - however, this was related to a central ventilation system.


We actually have a similar problem.
We are used to sleeping relatively cool at night. 18 degrees room temperature in the bedrooms would be a wish.
We have now already set our underfloor heating in the bedroom to 15 degrees. This made it bearable in winter – we both sleep year-round in short pajamas.
Now, however, summer is approaching. In the last few days, I have again been sweating more heavily during sleep. Consequently, the sleep is naturally less restful.
One might assume that it could be due to my physical condition (meaning – over the last 10 years I gradually developed from a V-shape to a Christmas tree :(). But my wife feels similarly, and she is really not overweight – she used to have the nickname "cold-blooded animal" given by me.

The only relief we can create for ourselves is completely opening the window overnight. This, of course, currently (spring or also autumn) counteracts the energy-saving efforts.
The orientation of the rooms is children’s room (south and southwest), bedroom (northwest). Before going to sleep, all bedrooms are generally ventilated intensively for 10-15 minutes (our room as well as the kids’ rooms) so that falling asleep is tolerable for everyone.

I think it is the combination of underfloor heating and good insulation as well as the (despite everything) existing heat exchange between the rooms that causes this.
Our decentralized ventilation with heat recovery naturally also keeps the heat in the house (that is one of its tasks).

Slowly, but surely, I am desperate. I don’t want to always throw open the windows and blow the heating energy out.
We already want to buy extra thin duvets – similar to those in vacation countries like Turkey, Spain, Egypt.

Do you have any tips or ideas on what else can be done (besides purchasing an air conditioning system)?

Have the underfloor heating properly adjusted... that means hydraulic balancing... assigning less flow to the bedrooms... it works for us...

Hello,

we initially had similar problems.

For the past two weeks, we have set the underfloor heating in the bedroom to "frost protection" at the room thermostat and always keep the bedroom door closed. In the bedroom/dressing area, we have both supply air and exhaust air from our [Kontrollierte-Wohnraumlüftung mit Wärmerückgewinnung].

Since the underfloor heating is basically off, we sleep much better.

The required warmth now mainly comes from heating the water cores in the waterbed – since these two heating mats together have 400 W and are in operation about 1 hour a day to keep the water cores at 29°, the energy consumption for this is negligible.

Regards,

Dirk

Just have the underfloor heating properly adjusted... meaning hydraulic balancing... allocate less flow to the bedrooms accordingly... it works for us...

Thanks for the tip.
Hm - it would probably work for the bedroom.
I am hesitant to generally reduce the flow for the children's room. The children are supposed to play in their rooms (which already works for the older one [4 years]) – in my opinion, a general reduction (also in winter) by hydraulic balancing would not make sense there.

Hello,

we had similar problems initially.

For two weeks now, we have set the underfloor heating in the bedroom to "frost protection" on the room thermostat and always keep the bedroom door closed. We have both supply and exhaust air from our controlled residential ventilation with heat recovery in the bedroom/dressing area.

Since the underfloor heating is basically off, we sleep much better.

The necessary heat now mainly comes from heating the water cores in the waterbed - since these two heating mats have a total of 400 W and run about 1 hour a day to keep the water cores at 29°, the energy consumption is negligible.

I have to try that.
So far, I have been hesitant to not heat a room at all. I think I once read that this could have a negative effect.
If I remember correctly, this was again in connection with the ventilation – in an unheated room, water may condense faster (risk of mold growth). OK, for that the ventilation system would be there.

As written – best to just try it out.

I have to try that sometime. So far, I have avoided not "servicing" a room at all. I think I once read something that this could have negative effects. If I remember correctly, this was related to ventilation - in an unheated room water may condense faster (risk of mold formation). OK, I would then have the ventilation system against that.

You are probably right about that. However, we still have a constant 18°C in the bedroom (now with the completely turned-off underfloor heating). Heat transfer from other rooms still occurs through the interior walls, the controlled residential ventilation, the gap under the door, and the door itself. So the room is not really completely unheated.

Hello Dirk,

So the room is not really completely unheated.

Not that, but the other rooms have to be heated "more" because the air there meets comparatively colder air when it "moves"; the mix is below the room-side set temperature.


Rhenish greetings