The preservation of humidity, temperature, and odor will be aided by adequate air movement. Every few minutes, air should flow through a garden, and a vent should be installed to the outside. Odors can be quickly transported through your garden by oscillating and exhaust fans. Additionally, you will probably need a grow tent or a mechanism to ventilate your grow space if you plan to grow cannabis seeds inside.  Try moving heated air out of the area and bringing cold air in by maintaining a constant airflow through your growing space. Installing an exhaust fan near the top of the room to remove warm air (warm air rises) and a port fan on the other side of the room near the floor to let cool air in is an easy way to achieve it.