I use a space heater in my 10' x 20' snake room. To keep it in check I point it at an air filter, similar to a box fan but it blows the air up instead of sideways, probably about the same airflow as a box fan on high. Then I put the thermostat sensor right above the air filter so it only turns on for a short period of time. Takes a little bit to get the room up to temp but it's rock solid once it gets there and never overheats. You just need a fan or something to move that space heater heat around a bit faster and put the thermostat right in the fan output so you don't get hot spots.
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