Hi Guys
My first post.
At the risk of talking about something that has been done to death.
I have a grow tent measuring 90x90x170cm. I've been struggling with getting the temperature drop at night. Daytime temperature, lighting and humidity are all good. With lights on the temperature reaches 25-26 degrees. Then drops back to room temperature (20 degrees) when off.
Tried ice packs and bottles of frozen water, passive venting with exstractor fan. Even tried a small box cooler as seen on TV.
Nothing has helped bring the temperature down to 15 degrees.
Any advice would be great.

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