I have a work shop in my back yard that I've always kept my stuff in year round. It is sealed off well and the walls are insulated. I work in it year round also. I've never had a problem. I got out of flying for a few years and am using some 3 year old Power Master and it's burninng fine, hasn't even discolored. Use common sense and you'll be fine. I see you are in N.C. you probably dont see the temp. changes ( -20 at night and in the 60s during the day)we do here in UT. Moisture is our enemy.