Do you have to have ventilation?

Can't u just keep the thermostat on a certain temp? Im talking about growing in 3 outta 4 rooms in house. Put a Co2 in every room?

Oh 3 rooms are in same area, so can i just open doors with fans?

ILLEGAL NATURE 420 said:

Oh 3 rooms are in same area, so can i just open doors with fans?

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That's what I do. I just leave the door to the room open.

Works great with the house at 73 and the tent in the basement

If heat and odor is not an issue for you then ventilation is not as big of a concern. You still want to make sure you are getting fresh air into the rooms, but that can be easily accomplished without setting up a true ventilation system. Simply keeping the doors open as much as possible with a decent oscillating house fan should do you well.

Fresh air is key.