I'm in a outside single block shed in the UK mate and struggled in the past
Only way around it is to run 600w hps with a oil radiator on a thermo set at 26 degrees
Lights of the oil heater is set to 20 degrees
It's the only way around it for me and seems to be working.
The only problem I get is high rh in flower when the lights are of as I said in a post yesterday.
Other then that all is good
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