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its where my grow box is. The box has 3" of insulation but when it gets to 7c outside i need to keep it 24 inside.

Hey peeps I have an outdoor growroom and its insulated well but with winter coming up i want to know what is the best was to raise the temp. I have 1 underground heat wire heating up the sand but its still at 17c i want it to be about 24c - 78f the box is 1.25m wide x 1m long x 1m high...