[.:4:.]

Ventilation. Not so much for sniffing fumes, but more trying to keep the inside temp of the shed closer to the outside temp then being a sweat box in summer. Insulation and whirly gigs work, but whirly gigs only do so much. So, granted my house is built like a house not a shed, but im making the safe assumption your shed will have power. One thing that i wired into my house is an exhaust fan on a thermostat. So the mushroom housing protrudes through the roof tiles. The thermostat is set at 40 degrees, being a house, 40 for the temp in the ceiling space is around 28. It doesnt cool the house, but it prevents it getting more then a handfull of degrees warmer then outside. So i dont run mine off a switch. Its straight off the thermostat for my house, but i tend to live in my house every day. An in a sweaty shed working away, being slightly less sweaty working away in the warmer months may be of a minor advantage.