We’ve used a buddy heater for
several years. First in a tent and then in the cab of a semi-truck with bunk
beds. We used it all night. It had a thermostat and would cycle on and off.
Since neither the tent not the semi was air-tight AND it was touted as something
you could use inside, I only worried about not waking the first couple of times
we used it. It then became a fear that I’d burn the tent downJ It was VERY effective
for us.