Retrofitting bathroom ventilation with heat recovery

Hello everyone,

We built last year without a ventilation system and are satisfied with that.

Only in the bathroom, due to my wife's extensive showering habits, there is often a significantly increased humidity. This in turn leads to multiple ventilations, which makes it too cold for my wife in the bathroom again :rolleyes:

We are now considering retrofitting a ventilation system in the bathroom. We would like to install it in one of the two exterior walls. Power is available in the attic above.

We understand that a core drill is necessary. However, we would prefer to run the power supply either inside the wall or on the outside of the wall leading to the attic. Reason: The interior plaster is finished and nicely painted. Outside, only the base plaster has been applied so far. There we could easily chisel a groove and "fill it again with base plaster". I am aware that this creates a small thermal bridge.

Has anyone done / had this done before?
Are there any experiences / recommendations for specific devices?
Is the power line routing as described above possible?

Thank you :)

Good morning Jochen,
sounds at first like the standard retrofitting of a ventilation system in existing buildings.
There are quite a few manufacturers who offer such ventilation systems. The biggest problem in your case is probably the switch.

The switch is also no problem if there is power, for example from eocean impulse switches with radio.

Or from peha, etc.

Okay, so far I didn’t have to inform myself. Then everything is easy to implement.

A powerful bathroom exhaust would be better, right?

Thank you all for the feedback.

, why should an exhaust-only system be better?