Cheaper than that is a air exchange every 30 seconds if I remember right. Will give you most of the benefit of co2 additions. Lots of co2 in normal air.
i ran a completely sealed room for 2 years before adding co2 and had great yields. they will do fine with just you exhaling in the room. wait and do it right, that heater idea sounds like a very bad one.
They stink, and they can be dangerous as well. If you want added CO2 they have them bags you can hang up that last like a month at a time. I've never used it either and I have a sealed room that only brings air in but not out. I dont have a scrubber to clean the outgoing
But, $5+ per gallon for kerosene for 8-10 hours burn, plus you will have the added heat, fire risk, etc. I personally wouldn't.
If you want a cheap alternative, spend more time in your room, maybe take your dog or cat with you to help out.
Dude, you must live in a brewery! The rest of us have to make do with only 250-300 ppm in "normal" air. If I could get 600 ppm out of my air, I would be happy and never look back!
But, $5+ per gallon for kerosene for 8-10 hours burn, plus you will have the added heat, fire risk, etc. I personally wouldn't.
If you want a cheap alternative, spend more time in your room, maybe take your dog or cat with you to help out.