From old school thinking and experience:
Cole, not that I know anything about greenhouses, but the kerosene salamander should work better outside blowing in. If it is anything like the ones we used in the 1980s and 90s - the thermostat kicks in by the temperature of air going into the unit - causing it to shut off when the intake air is warm enough. In theory, that works, but it can get too cold before the unit turns back on. Keeping it outside blowing in could also cause it to never shut off. You're going to need to do some math on using that timer.
Like I wrote in the beginning of my post - it comes from old school thinking and experience.
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