I posted this in another heater thread but thought it may get more response as a separate topic... My question is about the Vent-Free natural gas wall mount plaque and/or "blue flame" heaters I see advertised everywhere for 250.00 or less... I read about the risk of carbon monoxide, but I was thinking of using one set on low to just keep the garage above freezing when I am not out there.....They are actually designed for use inside the home, so i can't see how they could be as dangerous as some people have said they are... Are they safe to use from a fire-risk standpoint? I'm much more concerned about burning down my new garage than I am about carbon monoxide. What are the major downfalls? I have also heard without a vent they will create moisture... just HOW MUCH moisure are we talking about? If i use a dehumidifier in conjunction with the vent free plaque heater can I avoid any condensation/dampness problems? I am very seriously considering installing one of these to keep the chill off my garage over the winter months... I won't be doing much if any work out there, just trying to keep it above freezing. Because i don't plan to do much out there in the winter, i cant justify the expense, labor, and hassles of putting in a big vented heater/furnace to simply keep my cars from freezing. I plan to install a shut off for the natural gas, right at the vent-free heater, so if it proves to be any problem or hassle, i can just shut it down and use the heater as a wall decoration... any opinions?