Ventilate the winter garden? Which parameters?

Hello everyone,

I have a heated winter garden with double-glazed windows. For cost reasons, I lower the temperature at certain times accordingly.

My KNX sensors know the humidity and temperatures from inside and outside.

How should the values relate to each other so that I can ventilate automatically and sensibly through the roof windows?

Basically, I am initially interested in the mathematical basis. I can manage the implementation myself.

Thanks & regards Christoph

I would use the dew point as the basis. Calculators for this are freely available - or derived from this, the algorithm...