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Here's a really easy VPD Calculator. You can play around with different room and leaf temperatures and relative humidity.

Any time I see VPD I'm always out there hocking my wares! Click here for a VPD Calculator. Once you hone in on a VPD you can make adjustments to optimize growing conditions and energy consumption. Happy growing :)

I would think that the surface temperature should be taken at the leaf. The VPD is the difference between the room conditions and leaf conditions. The bud is probably somewhere in between these conditions (is my guess). Here's a Calculator where adjusting temperature and/or humidity calculates...

If you're looking to hone in on VPD, here's a Calculator where adjusting temperature and/or humidity calculates the VPD

Looks like you have plenty of sensors and calculations but just in case, here is a VPD calculator that may help.

I am not sure if this will help you but here is a VPD Calculator . Good luck!

Always working on new calculators. I will think about the cooling for grow rooms but there may be too many variables. Any other ideas just let me know!! :-)

Also want to say you guys are very nice - I am in a general HVAC forum and those people are angry 99% of the time. Nice to be here :-)

Hey @Ecksrdz , the temperature, and humidity are related. You can use this calculator to find your VPD. Recommended VPDs range from about 0.8 when you are propagating and 1.6 for flowering. Depending on your humidity sounds OK. It is my understanding that VPD is considered the "special...

Hey there! I am an engineer and live in Florida where recreational use will probably never be legal 🥴. But I have been learning somethings about growing and want to learn more. I create engineering calculators with the hopes of making engineering concepts accessible to everyone. I just made one...

Yikes, sounds like @Dizzy88 had good practical advice for this batch. In the future, the best way to control the environment is by monitoring Vapor Pressure Deficit (VPD) which is based on temperature and humidity (here is a calculator). Each grower's VPD is their "secret sauce" for optimal...

Hey @GrowWithTheFlow, the best way to control the environment is by monitoring Vapor Pressure Deficit (VPD) which is based on temperature and humidity (here is a calculator). Each grower's VPD is their "secret sauce" for optimal growth. It looks like your VPD goes from about 2.13 during the...