Ha, ha! That's so true. The guys using chems don't want to lose their income stream. There is no need to use chemicals to kill bed bugs, which are a big problem now. I have posted many times in the broad mite thread about a company called Pest Heat. They sell systems that heat up your residence/space to any temperature you program it to. Bed bugs require 150 degrees, but these machines can do it. They can also be set to 120, and hence will kill broad/cyclamen mites, without harming your plants.
www.pestheat.com
Check them out. If you have a large warehouse grow, this might be the way to go.
So how do you use this system with plants in the room? Im not saying its not effective but from what I read you need to use high output fans to distribute the heat evenly. So do you then recommend not using the fans? just the propane hi output heater and sensors?