All right guys I need some expert advice, I just bought a Coleman perfectemp sportcat which is 1000 BTU. I also got a converter and attached it to a 30 lb. propane tank. I was wondering how many times a day I should leave it on and for how long in order to add CO2 to my environment? My grow space is about 196 cubic ft. and 28 sq. ft. The dimensions are 3.5 ft wide by 8 ft tall by 7 ft long. I have a Conair evaporative air cooler in front of one of my bedroom windows blowing cool air in and a 6 in. inline 440 cfm fan exhausting air off the lights attached to the tops my hoods. Anyone know how I should go about using my propane heater to increase CO2?

Heres a link to the propane heater itself:
http://www.fogdog.com/fog-coleman-sp...i-1878146.html