Best Greenhouse window opener


  • Temperature Activated (Heat, Sun, Solar) Vent Opener can...
  • Starts opening between 65 to 77 degrees F, depending on how...
  • Easy to install, Screws directly into polycarbonate panels,...
  • Suitable for Most Greenhouses--This opener will...
  • Quality Construction--Reliable, quality built anodised...
  • Working Conditions--Start to open - 15°c - 25°c...
  • Material:Galvanized carbon steel sheet and aluminum
  • Ideal for your greenhouse window--opens and closes your...
  • as the temperature changes automatically, maintains the best...
  • Bayliss Greenhouse Autovent. XL Reliable, quality built...
  • 2 x Bayliss XL Autovent Automatic Vent Openers
  • Supplied with all fittings and Instructions, easy to install
  • Quality British Made Product
  • Aluminum Alloy, Durable and Rust proof.
  • Guarantees the greenhouse in the suitable temperature and...
  • Maximum opening weight 15lb, Maximum window opening 45cm.


Table of Contents:

Creating optimum growth conditions for plants with a greenhouse window openerGardening is very much in vogue. But once you are captivated by this passion, you quickly feel like more. The first attempts start many hobby gardeners and gardeners on the balcony. But the possibilities offered by flower boxes and planters are very limited. Anyone who is lucky enough to get hold of a small garden plot or even own a home with an adjoining garden soon dreams of a greenhouse. Thus, the garden season can be extended by several months and the first self-grown radishes can already be harvested in April. And even for the cultivation of young plants or heat-loving vegetables, a greenhouse is the ideal place – provided that the living conditions match the requirements of the plants.

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Our Top Greenhouse window opener Pick

Univent Automatic Vent Opener Standard - Lifts 15 Lbs
  • Temperature Activated (Heat, Sun, Solar) Vent Opener can lift up to 15 lbs
  • Starts opening between 65 to 77 degrees F, depending on how you have adjusted the cylinder
  • Easy to install, Screws directly into polycarbonate panels, wood, or metal frames
  • Unique hydraulic cylinder has 3 year manufacturer replacement guarantee
  • Versatile hinge opens cold frames, doors, vents and windows


Everything for the garden: Greenhouse window opener Video Guide

For plants to grow and thrive, they need light, water and nutrients. These are the minimum requirements that can usually be achieved quite well in a greenhouse. The glass or plastic walls let in enough light for photosynthesis to take place. A humus soil can be procured and water is also provided by the gardener. But that alone is not enough, as every seasoned gardener knows. Every plant species has its own temperature requirements. Tomatoes, peppers and eggplants are very warm loving. Lettuce heads and radishes thrive excellently at significantly lower temperatures. If the sun shines, the so-called greenhouse effect ensures that it can be pleasantly warm even in winter in a greenhouse. What is very beneficial in winter and spring can be a disaster in midsummer. Then it becomes unbearably hot under the glass roof, so that the plants could be permanently damaged and destroyed. Then only thorough ventilation helps.

Most greenhouses or cold frames are equipped with skylights that can be folded up. In the simplest case, you could do it by hand. But what happens when you are not home or forgetting to air? Then all the work already invested was in vain. So it is better to install a window opener that opens the roof windows as soon as a certain temperature value is exceeded. If it gets too cool, the ingenious mechanism will close the window.

In order to open the huge skylights of large greenhouses in large horticultural businesses, window regulators with motors are often used. Sensors and electronic controls measure the temperature and switch the engine when needed. Smaller skylights are easier to open and close with the help of a hydraulic window lifter. They have a simple lever mechanism. The lever rods are stuck in a tight cylinder filled with gas or a liquid medium. As the temperature rises, the contents of the cylinder expands, the rod is pushed out and the skylight rises. Upon cooling, the medium in the cylinder contracts and the rod moves back into the cylinder. These mechanical greenhouse window openers are relatively inexpensive and work very reliably.

For smaller greenhouses and cold frames, Einhell's automatic greenhouse window opener is recommended. The window opener has a lifting capacity of 7 kg, the maximum lifting height is 40 cm. The window opener has a cylinder with gas filling, which allows the uncomplicated temperature-dependent movement. The temperature range is specified by the manufacturer with a range of 13 ° C to 34 ° C. By turning the piston, the window opener can be adjusted before first use. Since there is no electrical connection, this window opener can be used anywhere. The installation is straightforward and requires no previous technical knowledge or skilled craftsmanship. A construction manual is included.

TOP 5 Greenhouse window opener Bestseller

Univent Automatic Vent Opener Standard - Lifts 15 Lbs
  • Temperature Activated (Heat, Sun, Solar) Vent Opener can lift up to 15 lbs
  • Starts opening between 65 to 77 degrees F, depending on how you have adjusted the cylinder
  • Easy to install, Screws directly into polycarbonate panels, wood, or metal frames
  • Unique hydraulic cylinder has 3 year manufacturer replacement guarantee
  • Versatile hinge opens cold frames, doors, vents and windows
Wiwir Solar Heat Sensitive Automatic Greenhouse Vent Opener Auto Vent Kit for all Palram Greenhouses (Single Spring Vent Opener)
  • Suitable for Most Greenhouses--This opener will automatically open and shut your greenhouse window to maintain the best growing temperature and preventing your greenhouse from overheating.
  • Quality Construction--Reliable, quality built anodised aluminium automatic window opener for greenhouses.
  • Working Conditions--Start to open - 15°c - 25°c (60°-77F); Fully open temperature 35° (19f) or above; Fully open distance 45cm (18")
  • Environmental friendly--Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops
  • Important notice: Do not use this opener anywhere the temperature will exceed 45° (122F). To use with the palram greenhouse, you need to use the drilling tools to screw into the channel and fix it.
Automatic Vent opener Vent-L N01 opening temperature 75-90°F of greenhouse load up to 220lb for window/doors
  • The automatic vent opener is located in the upper level of the greenhouse, it heats up faster, the plants at the lower levels are in conditions with lower temperatures. An opening temperature between 24-32 ° C (75-90 ° F) is better suited for most plant species. This is its uniqueness compared to other similar devices.
  • It does not require dismantling during winter.All the major fasteners are galvanized coating that protects them from corrosion in an environment of high humidity of greenhouse.
  • It can be fixed both for the opening doors and vents of greenhouses.Control of the starting of opening.
  • More than 10,000 times of opening/closing.
  • «Vent-L» does not require electric power and operates exclusively on the temperature fluctuations of the greenhouse. 4 screws for setting only.Stem diameter of 10 mm and a metal piston is able to open the window up to 100 kg (220lb) and can withstand enormous wind loads.Easy disconnect from the vents or doors for opening and closing manually.
Bayliss Greenhouse Autovent, XL
  • Bayliss Greenhouse Autovent. XL Reliable, quality built anodised aluminium automatic window opener for greenhouses. |Clamps onto most aluminium greenhouse vents â€" no need for drilling. |Can also be used for timber framed vents. |Will fit a window weighing 12.5kgs (28lbs), exerting a load of 6.5kgs (14lbs). |It is temperature adjustable and can be set to start opening the window from 13 â€" 18°C (55 -65 °F)
Vent-L Automatic Vent Opener N03 Opening Temperature 75-90°F Load up to 66lb for Window/Doors of Greenhouse
  • «Vent-L» does not require electric power and operates exclusively on the temperature fluctuations of the greenhouse. 4 screws for setting only.
  • It does not require dismantling during winter.All the major fasteners are galvanized coating that protects them from corrosion in an environment of high humidity of greenhouse.
  • It can be fixed both for the opening doors and vents of greenhouses.Control of the starting of opening.
  • The automatic ventilator is located in the upper level of the greenhouse, it heats up faster, the plants at the lower levels are in conditions with lower temperatures. An opening temperature between 24-32 ° C (75-90 ° F) is better suited for most plant species. This is its uniqueness compared to other similar devices.
  • Stem diameter of 6 mm and a metal piston is able to open the window up to 30 kg (66lb) and can withstand enormous wind loads.Easy disconnect from the vents for opening and closing manually.

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Best Greenhouse window opener
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