My best advice would be like most of the responses. One heater with a room fan(a small fan is enough on low to circulate the air).

I did much the same as you mentioned. The house was on central heat and air, the snake room had the heater on a thermostat. Worked a charm. I actually had the room over-heat more than once, so keep a close eye when it's setting up. Those heaters are REALLY efficient and you'll be amazed at how warm it will keep the room.