I’m growing in a cold winter in my gararge ingrow tent and finding it hard to get temps to where they should be , is there a way I can warm it up? All ideas welcome thanks 
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Can you maybe fit a little heater in there?
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Look into the ACI tent heater. Might work for you.
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Like @Audiofreak said… AC Infinity heaters… Just got one… One more on the way.
Or
Small oil filled radiator heater controlled by an inkbird temperature controller.
How big is your tent?
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Tent is six feet and small at the bottom like maybe three feet or something. I didn’t buy it so I’ve never known exact model. Thanks
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My 50-pint dehumidifier, adds heat while operating.
An oil-tube filled heater (no radiant coils) can heat.
Autos, running lights 20 hours a day.
All 3, possible.
And fourth, my personal favorite, a Second tent with lights on (heats the connected space or tent).
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The small oil filled radiator heater will work.
I used them in 4x4 tents… Had no problem heating safely.
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A tape measure will answer the ?. Is important to the answer. Size matters LOL.
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I’m in the same situation, growing in a tent in a cold garage.
I have a small block heater pointed away from the plant pots, and the air rises up into the fan to be blown around the tent. It’s controllers my by AC Infinity controller, but previously I used an I kbird controller. Both have worked equally well from controlling the heater.
Make sure you have a heater that will turn on and off by electrical outlet turning on and off, most heaters with digital controls won’t work.
My heater had a dial that affects how much heat it puts out, I have it down to low. I find it runs a bit longer and cycles on/off less throughout the day.
A couple other tips:
-insulation in the floor of your tent will help, this keeps the pots off the cold ground and prevents the roots from being too cold.
-I use a small fan at the ceiling of the tent, to blow air back down at the plants. I find this helps a lot to keep the temp/humidity in the tent more uniform. This minimizes being cold at the bottom and hot at the top.
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fits under two 4x4s with crossover between.
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