I only get up the plot every few days. My greenhouse has an autovent. Marvellous thing once fitted. You can adjust the temp on these so for summer just lower the temp at which it opens to save the heat building up too much. Mine survived last summer ok. I just open the door for extra air when I do get up there. I figure by summer when its hot you've only got the heat lovers in there anyway, everything else has already moved out.