There is no automatic opener but I bought one and I will make it fit on my door/windows. I bought a Bayliss for orchids with triple spring in case of strong winds:
Bayliss Mk7 Automatic Greenhouse Auto Vent Window Opener
There are four different varieties of Bayliss Mk7 available. The Mk 7 Orchid Wax version can be set to start opening the window at between 75°F and 90°F. Mk 7 Autovents - Simple, Strong & Easy to Fit.
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I should receive it next week and will make it fit. It will open when the temperature gets to a certain degree. A bit higher due to the orchid version, so it can be set to open between 75F to 95F. I will set it to around 80F I guess. Today it was 14C in my backyard and I left a little opening on both side of the greenhouse and it was 23C inside of it, so perfect. With the windows closed and full sun, it can get to 40C or more if there is no opening. You have 2 settings to open both doors and it is plenty enough. I wanted the automatic opener because I want to let it close when it's cold in the morning and I am going to work, but I need it to open when in the hot noon hours. Since I cannot come back home for lunch, I needed this. Also if I leave for vacation, I want it to be fully automated.
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Available in Silver, Green, Brown or White
There are four different varieties of Bayliss Mk7 available
The Standard Bayliss Mk.7 features a strong frame and a single strong spring, suitable for use on roof vents in fairly sheltered areas where strong gusts of wind are unlikely
The Triple Spring Mk.7 features the same strong frame and three strong springs which makes it suitable for roof or side vents in areas where strong gusts of wind may occur
The Hydraulicheck Mk.7 features the strong frame, two strong springs and a hydraulic damping unit making it suitable for roof or side vents in areas where strong gusts of wind are likely
The Mk.7 Super features a super strong, oversize frame and strong spring making it suitable for heavy conservatory or oversize greenhouse roof windows
There are two different Cylinders available:
The Orchid Cylinder is an alternative to the standard Cylinder for specialist applications where a higher opening temperature is required.
The standard Cylinder enables the window to be set to start opening between around 12°C (55°F) and 75°F (24°C).
The Mk 7 Orchid Wax version can be set to start opening the window at between 75°F and 90°F.