Stickanswered grow question 7 years ago Hi there! One obvious option would be to take everything that creates heat out of the room, but I guess you already did ? I know you don't want to spend money, but if you ever manage to get a budget then I'd recommend to switch from HID to LED/SMD. HID produce heat, SMD don't. You should take a look at "HLG", "QuantumBoards", "LM301B" & "LM561C". Hope this helps. Keep us up-to-date and happy growing!