I built the hoop house last fall. I realized right off that the inside temperatures were going to be a major problem without some sort of ventilation. I thought about exhaust fans, perhaps solar powered, but the costs of doing something like that was way more than the actual hoop house. Started looking around the internet and found some self adhesive zippers that are 7 foot long that you can stick on the sides of the hoop house, so that you can roll up the sides for ventilation. The zippers were 10 bucks each. I stuck one at either end and then rolled up the side. May do the same thing to the other side. Here are a couple of pictures.