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This is perhaps the best advice and most practical. I would perhaps add that a higher humidity is awesome for seedlings in my experience.
My grow this time has not been energy efficient at all, been kind of impossible to just keep the room cold and the tent warm. So today I opted for openening the tent up and just keep the room at a temperature I like.
All this was easier last summer when the outside temperaturee was higher than now.
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if i were you i would forgot about vpd, it has very little impact on growth vigor and attempting to control it precisely in a small space can create more issues than solving some.
most important is to keep your temperature in range 18°C - 28° then rh doesn't really matter for seedling, veg, and flowering stretch, and past flowering stretch you should focus on having below 50% rh to prevent mold.