Single paned windows, plaster walls = no insulation. It is 49 degrees in my house when I got in this evening. 3.5 hours ago. It is now 58 degrees according to my space heater. My wall heater does not work mainly because of the thermostat. It wont turn on until you set it 90 degrees. If you turn it down at anytime before it shuts off it will not turn on again for days, weeks. I just dont use it anymore.