If you only need heat by a desk or in a small section of a room, a radiant heater is quiet and will use very little power. Forced-air heaters use a fan to blow air that has been warmed by metal or ceramic heating elements. A forced-air heater is appropriate for quickly heating up a small- to medium-sized room, but can be noisy.
https://www.amazon.com/Reddy-Heater-Propane-Forced-Air-RLP30/dp/B00002N82E

