I’ve been using a “buddy heater” periodically with my thermoforge t3 grow tent heater . I have a ac infinity co2 controller with regulator etc - but right now I just use the buddy heater - as it elevates my 15x10 front porch co2 effortlessly to 1000ppm in the tent
If any body is looking for a cheap solution in an already cold environment , this will do the trick .