my tent has been hitting 40 degrees some nights. Still just fine. These ones were taken a few days ago and are all about to be bread. Neither tent have air exchange. I wouldnt worry about it. I mean its something to watch, maintain and control. 60 degrees at night. Thats warmer then my entire grows average temp.
I was looking into that. That’s a nice setup but there isn’t much room left in my tent at all for that big heater.
Was kinda hoping to heat the intake air being blown in from the outside. An in-line air heater would be nice but doesn’t Seem to exist. I know my 5.9L Cummins has a grid heater that heats up the intake air. Hmmmm
I actually just did this. But its not really for the average person to start ducting heaters indoors without understanding. So i dont want to be that guy but is a reason they dont exist for the most part. Because its a risk of fire and injury.
But lets just say a hypothetical how would i want to build a simple and cheap forced air heater for grow tents. I take a 55 gallon drum put on my fittings 1 in 1 out. I then put a 2 cinder blocks in the bottom of the 55 gallon drum. I then add my cheap propane heater i found for $5 at a rummage sale. Buy a 25ft propane tank to 1lb propane tank hose and run it from inside the drum to outside I now attach a heat rated vent duct. to my blower fan. It now sucks the radiant air from my drum. Or i can bypass all of that find a vented/ventless standing propane fireplace that has the 4" feeder duct you can attach to a blower. Go 6 ft of metal duct, Then attach to heat rated duct and blower.
Now you have CO2 as well as heat.
But seriously to the point the goal of any heating unit is essentially something producing heat in a box with air forced through or around said box. Lots of ways to achieve it. The best thing for a tent though will always be heating the space around it vs it. Or you will create a temperature differential that will ultimately throw your humidity out of whack. which you wont be able to compensate with air exchange simply because that will increase the effect. Since the amount of moisture in the air is related to temp. Warm air holds more water, when cooled fast enough it condensates. So heating the tent itself in the face of a cold space can create more problems vs heating the space itself.
I cant remember who used the term "lung room" but its very fitting. its easier to balance all of your atmosphere variables in a lung room than in the room itself when we are discussing small spaces within larger spaces. Smaller spaces = for more drastic effects.
really my belief is if i can keep it above 42F at night. Im fine. Cause it will go back to high 60s low 70s during the day. But because of that effect im going to need to run roughly 3 dehumidifiers to compensate. or the tents start to hit 90+ RH shortly after lights on.
So to all the principles and effects at play is more to the scenario to equate than just heat itself in the space. But considering how stable the space you are in overall. Probably wont be much of an issue as say someone in an unstable space. Like a shed or unheated garage. Where more fluctuation to those variables is at play, leading to more drastic effects.
Whenever discussing heating options always be aware of the dangers and risks involved. Personal heaters are a leading cause of fires like 40%+. So is real dangers or risks involved. All caution should be considered and largely each individual has to asses the personal risks to making these decisions. Im of the mindset the last thing you will ever need is a heater. Every other option should be exhausted. Just my tid bit.
I would trust that in a tent for sure. ETL certified zero clearance. Better than any light I've used 
