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motorhomer75

Heating Hydroponics grow box

Motorhomer
last month

Hi all newbie question. I have just started on Hydroponics and have built a grow box with lighting and two fans. I have read the fans need to blow air in with an exhaust outlet. My box temperature is low at 17 deg in day and lower at night. I was going to put in a heater but if the fans are blowing air through all the time will I not be just heating up the outside room which will them cost a lot. Any solutions, would just circulating the internal air be OK and do a change of air by opening the box once a day work

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