To put it simply, the ‘fireplace’ puts out warmth, but with a nighttime low of 20, we were going to freeze without the furnace coming on and we only set it to 50 degrees! It is necessary to keep the water and other pipes of the trailer from freezing. Our bed is cozy, but as my brother says, “We are heating a tin can!” My husband did some serious trouble-shooting – the manuals only tell you how to install the furnace, not troubleshoot. Eventually, he saw this green button called the ‘wizard mode’ and he reset it. YAY! We had a furnace, but the electrical smell continued to permeate everything throughout the night. Wizard mode … what the heck is that?!