Options for providing heat to a 4 x 4 tent

So over the summer I was able to solve heat issues in my 4 x 4 tent by using a portable air conditioner. Now that winter is coming I'm going to need to provide additional heat in the tent during lights out and maybe even lights on depending how cold it gets. The tent is in an attached garage without heat.
I've never had to deal with this issue so I thought the best thing I could do would be to reach out and find what others have done since this is obviously an issue that others have dealt with.
I'm currently looking at an oil filled heater like this 400 watt one to put in the tent. Anyone have any input? It likely won't drop below 40 degrees in the garage. I hope.

https://www.amazon.com/NewAir-AH-400-Portable-Space-Heater/dp/B009L40S0S/ref=pd_bxgy_201_img_2?_encoding=UTF8&pd_rd_i=B009L40S0S&pd_rd_r=18JEAF3M8T2TZQFC4ED4&pd_rd_w=Omd1I&pd_rd_wg=B2vSN&psc=1&refRID=18JEAF3M8T2TZQFC4ED4

Oil filled radiators would be your safest bet by far to leave running and unattended.

Kerovan said:

Oil filled radiators would be your safest bet by far to leave running and unattended.

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That's exactly my reasoning for going with oil filled. I'd be too nervous whenever I left knowing there was a red hot heating element running in my tent.

The only thing I don't like about that it isn't built like the traditional oil filled radiator with fin/tubes running vertically down the length for air to actually pass thru.

Agree I think they make thin radiator style heaters. That is what I'd go with

Run the lights at night when it’s the coldest

innerG said:

Run the lights at night when it’s the coldest

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I'm doing that. The issue is that during the day the temps can drop into the 40's during the winter. I'm going to need to keep it warm during lights off.

Says on the Amazon web site ships in 1 - 2 months.... yikes! But I think it will work if it doesn't get below 30F. You may have to add some insulation?

Moldy said:

Says on the Amazon web site ships in 1 - 2 months.... yikes! But I think it will work if it doesn't get below 30F. You may have to add some insulation?

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Crap. I didn't even see that. Well I guess that ones out. Guess I'll just head down to Home Depot or Wally World and get what I can.

xtsho said:

So over the summer I was able to solve heat issues in my 4 x 4 tent by using a portable air conditioner. Now that winter is coming I'm going to need to provide additional heat in the tent during lights out and maybe even lights on depending how cold it gets. The tent is in an attached garage without heat.
I've never had to deal with this issue so I thought the best thing I could do would be to reach out and find what others have done since this is obviously an issue that others have dealt with.
I'm currently looking at an oil filled heater like this 400 watt one to put in the tent. Anyone have any input? It likely won't drop below 40 degrees in the garage. I hope.

https://www.amazon.com/NewAir-AH-400-Portable-Space-Heater/dp/B009L40S0S/ref=pd_bxgy_201_img_2?_encoding=UTF8&pd_rd_i=B009L40S0S&pd_rd_r=18JEAF3M8T2TZQFC4ED4&pd_rd_w=Omd1I&pd_rd_wg=B2vSN&psc=1&refRID=18JEAF3M8T2TZQFC4ED4

Click to expand...

Run 2 tents so you have lights on 24hrs a day they will heat each other during lights off

I guess it depends on what part of the country you are in. Here on the wet side of Oregon, fall/winter/spring are so damp that I need to run a dehumidifier as much as possible. That unit puts out so much heat that in my (mostly) insulated detached garage, so far I haven't had to add a heater. I'm not sure what Dec/Jan/Feb will be like yet. Last year I was using HID lighting and that alternating cycles with the dehumidifier produced enough heat for 90% of the time (one really cold week I should have used a heater, but at the time I did not have enough power going to the garage). This year I'm all COBs and have more power out there, so I'm prepared to use supplemental heat. I have an external programmable thermostat plug, which seems to be accurate and I prefer to use over the "min/max" dial on the heater. It's programmable by day segments, so I can have it not go on while the lights are on if I want to avoid over-loading the circuits.