So this is where my seeds start life. Temperatures are a bit chilly here is Colorado so I have a couple heat pads and all my lights are on to keep temps in the 60's. When temperatures are warmer I use a small computer fan to keep the temperatures down. The bottom of the cabinet has a line of 1/2" holes that draw air off the cooler concrete below. Everything is duct taped shut to conserve heat at this point. If you are in a legal state, make sure to put a hasp/padlock on your enclosures to keep it legal. I have teenagers lol.