Monitor kerosene heaters work great in a small area, but if the area is large it is tough to keep the temperature even. It's too hot near the heater and too cold everywhere else.
In our house we have FHA, direct vent, propane. I'm not sure I would do it again. It's too noisy. FHA is noisy enough with the fan to distribute the heated air, but direct vent adds another fan to provide for combustion.
If you go direct vent, make sure the vent pipes are routed away from your bedroom and isolated from the house framing. Our seem to run right under our bed. Since we added some pipe insulation to dampen the noise it is much better but it is still there.
There is one last problem with direct vent, but it probably won't effect you due to your seasonal use. On the coldest days, we have had the vent intake clog up with frozen steam from the outlet. Some vent piping changes seem to have fixed, it but I won't know for sure until the next batch of -10 degree days.
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