No, cannot get air from outdoors, it's too cold right now, winter is at our doorsteps. Sending the hot air down to the basement isn't practical either as the room is located on the second floor of our house so I'll probably just send it out from under the door of that room and directly out into the second floor hallway.Humidity should be easy enough to control. I would have built the grow space in our basement but it already serves as my studio. Woohoooo, just received confirmation that my HPS lights system as well as the carbon filter and fans have been shipped ... I should get everything by the 16th +-.