J. Orbesen Teknik ApS has made window openers for more than 30 years, and is the world’s leading manufacturer of window openers. Find your perfect greenhouse auto vent in our wide selection.

Our automatic window openers use no electricity

We have been manufacturing automatic greenhouse window openers for hobby greenhouses since 1981.
The core technology in our window openers is the hydraulic cylinder that contains a plant-based wax. The special designed cylinder containing this wax, works as the greenhouse window openers thermostat, leaving no need for an electrical power supply.

Due to this fact, you don’t need any electricity for the window openers in your greenhouse. Furthermore, the window openers are very environmental and CO2-friendly throughout its lifetime.

Temperature controlled window openers

This unique temperature control unit opens and closes the window as the temperature in the greenhouse changes. It is an important contributor to the condition of your plants.

Due to many years of developing our products with professional greenhouse manufactures, installation of our window openers is very easy. Window openers from J. Orbesen Teknik fits all greenhouse models on the market. Our greenhouse window openers can easily replace both manual window openers and other automatic window openers.

The hydraulic cylinders used in our greenhouse window openers, are also used in a wide variety of applications e.g. roof hatches; helicopters; power plants etc.

Find your greenhouse window openers right here

In our wide selection of automatic window openers you will be able to find the perfect greenhouse window openers for you.

Please allow yourself to take a tour on our website for more information on these state of the art window openers. Furthermore the website presents high quality pictures of all our products. You are of course also welcome to give us a call if you have any questions about our window openers.

Let us help you with your new window openers

We are very passionate about customer service and our window openers. Contact us today and let us help you and your greenhouse.

Read more here on our website, about our Danish designed and produced window openers, or contact us for further details.

For Professionals/B2B
For Professionals/B2B


Please contact us

Phone: (+45) 59 65 17 17

Monday-Thursday: 8:00 am – 16:00 pm

Friday: 8:00 am – 14:00 pm