@mscherr and @mwittig I added the reference [wetterochs.de] to the github project. When working on the plugin I took the formula from the online calculator on this site.

I just compared it with the equations and constants from the pdf of vaisala. If you take 20°C and RH50% then the deriviation of the two is 0,0087°C. Table 1 of the pdf has the constants for the calculation of the saturation vapor pressure. Indeed those values are different from the ones in the online calculator, but very litte. For the comparison I took the average of the value from (-20°C to +50°C) and (0°C to 200°C).

Something I found out when searching the web is that there are no uniform constants for calculation the saturation vapor pressure. But all the constants are very close to each other and base on several organizations doing research on this.

The absolute humidity seems to be right. The only thing is, that from the equation on wetterochs, I couldn’t find the same result, but if you use the calculator the results are nearly the same. Good work on that, @mscherr!

On question I still have: How does the plugin description on the pimatic.org website get updated? Is there something I need to do? I’m trying to get into this github, npm, open-source thing. I never did this before

@mscherr How did you implement the ventilation suggestion?