Hi dolivo, funny you should ask this. I had the exact same question two months ago when I bought a very similar greenhouse. I also purchased an inexpensive thermometer to hang inside. One caution. Tie it down or the first strong wind will catch the plastic and flip your precious little seedlings to the ground. Spoken from experience - lol. To answer your question, my greenhouse was never more than about 10 degrees warmer. On cold nights I zipped both sides to the ground and checked the thermometer early, midday and just before bed a few hours after the sun had set. We had cquite a few nights in the mid 30s. The greenhouse at that time was around 45. My tomatoes did just fine. Everything inside faired well. I didn't lose one plant. On colder nights, I brought tomatoes and peppers inside but left lettuce, cabbage, celery , etc. outside in the greenhouse. Those things survived nights as low as 28. Now the heat is another story. Boy does it get hot inside when the sides are zipped. I unzip every morning before 8am, to allow for air circulation, but even this doesn't cool it down inside. It still gets hot enough to bake your plants. Tomatoes dry out quickly and need watering daily. It was 72 the other day. The greenhouse thermometer, in part shade, read over 80! Don't place it in direct sun all day unless you have time to nurse it. If you do choose a sunny spot, You will need to check plants often throughout the day. Mine is east facing and gets sun the first few hours of the day. The plants are growing nicely. I should note that my greenhouse is stuffed full of plants. I think that somehow impacts the internal temps. If you have to leave it unchecked for a while, it's better to leave it unzipped. On cold nights, the plastic still provides adequate protection from light frosts. April P.s. The heat and humidity are great for seed starting. My okra loves it in there!

Sorry ya'll! I forgot all about this post. I have a few pictures of how it came out for anyone who wants to see them, I'll start a new post. Girlsaylor, the gift you sent has many babies coming along, I'll be able to pass the good deed along this spring, I think. Yes, I spend a lot of time out there! Bluebloom, I'm so glad you like it! I'm very pleased with the structure over all but there are changes I'm working on. Dryndusty, I'm pretty sure you can grow a lot of things there that are impossible to consider here. If it can't stand to be wet, warm and humid it's gonna croak pdq here. There are some things I'd love to have but don't want to give the plant a death sentence. Necia, DH says that parks are for running, lol, he was an environmental scientist for many years and hates mowing so I had a head start, lol.

I bought a 6 X 8 one about 12 years ago. still standing here at the JerseyShore, even thru Sandy. BUT one of my windows blew out. we tried taping, caulking, to no avail. it's now sitting in its place on top on the greenhouse but with a stiff wind it'll blow off again. I don't want to spend the money to replace it, but I would take any suggestions as to what else I can use up there. you really can't screw or hammer since the parts are all plastic. ugh. also yes, it gets over 100 in there on any given summer day. so I go in there basically in the spring and fall. I have an outside cat that uses it for shelter. I can winter over some perenials in pots and start seeds in the spring. also looking to make it cuter in there. that's all I got. thanks!!

One thing a GH will allow you to do is alter temperatures, humidity, and light exposure. The link I have added is just a general example of an evaporative cooler. Basically, water is misted through your wall. As far as what to grow, that's not a hard question. What produce do you eat the most of...start with that. What produce is least available locally...grow that. Can you grow anything that can be stored for later use (potatoes, carrots, onions, shallots, etc...) grow that. Of course many of these are not necessarily GH candidates, but hopefully you get the idea. Then there's the germination side of things. You will be able to get heirloom seeds started earlier and in better conditions with a GH. At any rate, think first of your own consumption, then think about things you'd like to show off to friends (e.g. your very own Orchid), and if so inclined, something you could sell at a local market (I have Shiitake and Oyster mushrooms on logs, but they wouldn't do well in your outdoor environment, but could do very well in the controlled GH environment.) Good luck and have fun. Cheers, Russ Here is a link that might be useful: Evaporative Cooling Products