Just received 2 units for my home. One placed in our living room (12x14ft ) and in an eat in kitchen (20x16ft) Each unit took about 5-10 to set up wifi. Install was quick and calibration was simple. So far I have set the settings to maintain the spaces at 68°-70° . We tested to see it work at 74° and how long it would take. It warmed both spaces quickly and quietly. So far we are happy with the units. We like the sleek look and style as well. The filters are life time filters, wash dry and reuse which we like. If they work as well as they seem to so far we will be purchasing 2 more for bedrooms. Just for square footage sake our home is a small 1000sq ft home. We can feel the heat spread across the areas with no issues. Make sure units are at least 2ft off the ground if wall mounted and have sufficient space on both sides and in front for best heating. Oh the cords are long too. Update since purchased. I'm buying another one. These heaters are better than the old furnace we had. The amount of heat these put out is amazing. We use the units on low and on a temperature timer.