Yes you do need to bring in fresh air and have air moving around your plants is a must. I would check the humidity and see where it averages. If you are above 60% then I would say no. I good temperature / humidity controller is strongly suggested. You just plug in your fart fan and a mister and set the dial. It will turn on and raise the humidity then turn it off when it reaches the set percentage. You lower the humidity for flower so you donā??t get mold on the buds. You can have a constant humidity but you need to also have a sulfur burner to combat the mold and a controller for a dehumidifier. The more you use automatic controls to monitor your environment the less work you will do and the larger, better, and happier your plants will be in the end.