We just installed our Econo Heater a few days ago in Isla's room. Our house has next to no insulation. There is some under the floor of Isla's room but none in walls or ceiling and it is a 1970's concrete block house so gets VERY cold in winter (we are in CHCH). Anyway, we leave it on 24/7 and it has been sitting at an average of 17degrees in her room. (we can get it up to 20+ degrees in there if we crank the heat pump in the lounge up to 26 degrees) The coldest it has got down to is 14 degrees but that was when there was a chilly frost outside! Without the heater it would be down around 10-11 degrees on a cold day... would hate to imagine how cold it would get during a frost without the heater! I rung the Econo Heat company before buying and he said they don't kick out huge amounts of heat but will warm the room to around 5 degrees more than what it would be without the heater. I've been pretty impressed with it so far! Easy to install too! If my DF can do it, anyone can! lol