We researched every "safe/less flamable/space heater" on the planet- Edenpure kept leaping out even with the bad/negative reviews and comments- WE LOVE THEM- We could not believe the differnce within 24hrs of turning them on as far as comfort and room temp control supplement. Our heat is propane and at over 3.00 per gallon the fact that the heat only comes on 1 maybe 2 times a day is great. The unit is expensive but so far we are pleased that it does not get hot and sends out an even stream of warm air with no eye drying results. We also gave dogs and it does not attract them like other space heaters...