They say too much of a superb thing is bad. This definitely is true, especially when it comes to heating and A/C systems. I had this issue with a portable furnace that I had bought! Back when, I remember portable furnaces to be pretty weak and just enough to take the chill out of a room. However, these new section furnaces are not like that at all. As a matter of fact they are way too powerful if you ask me! I had the portable gas furnace I bought in our study room to keep me warm while I was sleeping. A way to save money on running the central heating system, but well, I woke up feeling like I was going to die! It must have been over 100 degrees in the study room! This was with the portable furnace being on the lowest setting. I can not tell you how this shocked me. I ended up having to open up a window and let the cold freezing outside air come into the study room for about 10 minutes to even somewhat cool it off enough for me to be in there. I returned the portable gas furnace to the store and told them that it worked too well plus that I could not deal with risking giving myself a heat stroke. The store refunded me and decided to report this to the supplier that made the portable furnace that I bought. They need to make some adjustments before shipping out any more of these portable section furnaces for sale. They could be deadly if one doesn’t think this could happen!