Humidity bathrooms

I use a Xiaomi Aqara temperature and humidity sensor in each bathroom, and I also have a Netatmo indoor station that I use to correlate.

I keep an humdiff variable updated for each bathroom, which should be the humidity in the bathroom minus the humidity in the living room.

Then for each bathroom, I update a vent-hum-bad1 boolean variable to indicate whether the humidity level is sufficiently higher than the reference in order to trigger ventilation:

Here is an example of insight of the humdiff variable after a shower. It triggered ventilation to run on high for about an hour.

Humidity in bathroom1 compared to a reference, after a shower