Exhaust fan hook to thermostat or timer,

i plan on using a low cfm bathroom fan operating constantly and a 8inch inline fan witch will be set on either my thermostat or a timer,,,, or do i set it on the timer in relation to my co2 system?? im so comfused i cant spell my name

thermostat on a timer that goes on when your lights go on. do u have a ppm measuring device?

no, not yet, the whole thing is in the making and im trying to piece it all together so i know what to buy,, so does the ppm meter act like a thermostat and shut off the co2 or??? and i figure the 8inch inline fan cant run constantly can it??

you can get controlers that can do most of your fuctions.

to many variables.... are you venting through a cool tube? when your lights go off and the co2 is off the temperature will need to be lower than with the co2 on, so a thermostat option may not work as you'll want different temperatures depending on co2 concentration. if you have the money i'd recommend two fans. one for the light through a cool tube with a timer so it only comes on when the light is on and a thermostatic controller to control the temps while you're giving it extra co2 would be the best option imo