Natures Way said:

I go to 60 deg. lights out and let the light heat at lights on to 77-82 deg
But be careful... make sure you have plenty of air movement in room to reduce PM when temps get that low
But the absolute minimum I would go is 50 deg. 45 deg. triggers final attempt to procreate and hermie on you. as well as trigger the start of it's death.
Here is a pic of what 60 deg. temps does to this Critical 11View attachment 566382

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rmoltis said:

What about the lasko 200 watt mini heater.

If you Google lasko 200 watt heater
You will find what I'm talking about.

It will draw much less current than your 1500 watt.
But will efficiently heat up your tent and Is small enough to fit inside.

Another option is to get those 200 watt ceramic ir heat emitter bulbs and hang one inside your tent. They won't create light at night to bother your plants.
But will create warmth

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Natures Way said:

Your 1500 Watt space heater can cost $100 per mo.+ if ran 24/7
So only heat area you need heated, and maybe wrap as much of your tent as possible w/insulating wrap of some kind to help keep heat in better...

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Seamaiden said:

I agree wholeheartedly with this. OR, go with an electric blanket hung inside the tent, it's going to use a fraction of the wattage as the heater. OR, if you're gonna run that much wattage, add more light instead.

OR, you can do an Electric Blanket Sandwich, placed under the pots.

I've never done a tent, we built a small room. So having framing and such makes certain aspects easier.

Those styro sheets work a TRICK.

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