This isn't really in the usual thread of these forums but physics is what I need to provide the answers and I don't have a good enough grounding in the topic. Here is my problem: I have a storeroom that is about 5 x 2.5 x 4 m. At night it is locked up for around 12 hours duration. Inside the storeroom there is no proper ventilation. Beyond the cracks beneath and above the door and a blocked air condition vent (only adds a one meter cube of space to the room) it is a sealed room. Inside the room I have five fridges/freezers: one chest freezer, two double door freezers (2 x 2 x 1 m) and two double door fridges (2 x 1.5 x 1 m). When I walk in in the morning the air temp is usually pushing 50 C. And the freezer is usually hovering at or above 0 C. During the day, the door is kept open and everything operates normally. My question is this: Is it the hot air being pumped from the freezers/fridges that is causing the freezer to fail? If so, will installing an air con for use overnight fix this without proper vents? Thanks for any help. Donna.