Second to what tinytoon said....

However, if able to seal the room the cab is in, away from the rest of the living space/house, you can run Co2....just make sure you setup a vent system for the room as well as the cab....

How you ask.... You isolate the air cooled hood air flow....intake loop through hood back around and straight back outside.... Then have a dedicated intake and exhaust for the cab.... With a injection kit and Co2 bottle and Co2ppm controller, you can control the Co2 ppms in the cab.... I would exhaust every 4 hours of the 12on part of the light cycle....and don't let the Co2 run during the dark cycle.... And timers can exhaust and intake the cab.... Electric dampers that are normally closed would really help with sealing the ducting lines keeping the Co2 from flowing out on it's own....

So with some dampers, fans, timers, ducting and Co2 equipment, you can do it....

As long as it's not a living space....

Carbon Dioxide Comfort Levels

CGI::::::