Waste of time and money at this level IMPO. It won't hurt anything especially if your plants are using up the Co2 in a tightly closed up house. I did not get enough of a boost in yield or quality when I tried Co2. The cost of the gas was not offset and the damn tank always ran out on Sunday when everything was closed.
In an actual grow room that can be airtight with AC cooling and a gas generator I think it becomes viable.