Ambient of 72 is not okay as most people will say. But, I saw people that keep at 70-75 with no problem, don’t know if it is true or not but does not mean you should. It is better and best to keep ambient at least above 75, with space heater. These days, many space heater comes with built in thermostat. I recommend oil filled radiator. Set it to what you desire, if room is well insulated (no window or little window, door closed all the time etc) it will keep heat from space heater better.
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