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That's going to depend on

- the beginning temperature in the room, before you light the heater

- the relative humidity inside the room

- the height of the room, floor to ceiling

- the rate of heat loss ('R'-value) of the floor, ceiling, and walls

- the temperature outside the room

- the means of air circulation in use inside the room.

In general, unless the temperature outside the room is 120 or higher,

you can never turn off the heater for good.

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Q: How many btu's are needed for a propane heater to raise air temperature to 120 degrees Fahrenheit in a 13x15 room?
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