How do you vent it? My green house gets over 100 degrees on sunny days even if it’s in the 20s outside.

too small to be useful

We put breather holes both above and below the line of dirt at the back, but we are also above the 50th parallel so we don't have as direct a sun as those to the south. On hot days the front lid has a second catch to keep it open four inches as well.

It's very nice. But it looks like the roof is pitched to the house instead of away from the house. I'm not sure if it is or it just looks like that in the photos.

The roof is pitched to the house as per client request to increase the size of opening at the front. Below the bay window is a surface water filtration taking excess rain water to the buildings storm drains.

How do holes below the dirt line help? I live on the 45th parallel and know for a fact on a 35 degree day in March a sunny day will take something like your sugi to 140 degrees.