The 10 best automatic greenhouse window opener 2018

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Finding the best automatic greenhouse window opener suitable for your needs isnt easy. With hundreds of choices can distract you. Knowing whats bad and whats good can be something of a minefield. In this article, weve done the hard work for you.

Product Features Editor's score Go to site
Univent Automatic Vent Opener Standard - Lifts 15 Lbs Univent Automatic Vent Opener Standard - Lifts 15 Lbs
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Wiwir Solar Heat Sensitive Automatic Greenhouse Vent Opener Auto Vent Kit for all Palram Greenhouses (Single Spring Vent Opener) Wiwir Solar Heat Sensitive Automatic Greenhouse Vent Opener Auto Vent Kit for all Palram Greenhouses (Single Spring Vent Opener)
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Jack-Store Solar Heat Sensitive Automatic Thermofor Window Opener Greenhouse Autovent Vent Opener Standard - Lifts 15 Lbs Jack-Store Solar Heat Sensitive Automatic Thermofor Window Opener Greenhouse Autovent Vent Opener Standard - Lifts 15 Lbs
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ZKer Carbon Steel Automatic Window Opener, Automatic Greenhouse Roof Window Vent Opener Lifter Solar Heat Sensitive Greenhouse Vent Opener Sets Standard- Lifts 15 Lbs ZKer Carbon Steel Automatic Window Opener, Automatic Greenhouse Roof Window Vent Opener Lifter Solar Heat Sensitive Greenhouse Vent Opener Sets Standard- Lifts 15 Lbs
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Double Spring Automatic Window Opener Carbon Steel Greenhouse Window Automatic Vent Opener, Solar Heat Sensitive Window Roof Auto Vent Opener Temperature Controlled Automatic Vent Opener- Lift 15 Lbs Double Spring Automatic Window Opener Carbon Steel Greenhouse Window Automatic Vent Opener, Solar Heat Sensitive Window Roof Auto Vent Opener Temperature Controlled Automatic Vent Opener- Lift 15 Lbs
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Bewant Automatic Window Opener Thermo Solar Heat Sensitive Greenhouse Vent Opener Auto Vent Kit (Lifts 15 lbs) Bewant Automatic Window Opener Thermo Solar Heat Sensitive Greenhouse Vent Opener Auto Vent Kit (Lifts 15 lbs)
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WElinks Carbon Steel Greenhouse Window Automatic Vent Opener, Solar Heat Sensitive Window Roof Autovent Vent Opener Standard- Lifts 15 Lbs WElinks Carbon Steel Greenhouse Window Automatic Vent Opener, Solar Heat Sensitive Window Roof Autovent Vent Opener Standard- Lifts 15 Lbs
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Standard Hydraulic Cylinder Replacement for Univent, Thermovent, Optivent, Ventomax, & Sesam Liberty Window Opener Standard Hydraulic Cylinder Replacement for Univent, Thermovent, Optivent, Ventomax, & Sesam Liberty Window Opener
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2 x Bayliss XL Autovent Automatic Greenhouse Window Opener 2 x Bayliss XL Autovent Automatic Greenhouse Window Opener
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Automatic Greenhouse Vent Opener Automatic Greenhouse Vent Opener
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Reviews

1. Univent Automatic Vent Opener Standard - Lifts 15 Lbs

Feature

Solar Vent Opener can lift up to 15 lbs
Starts opening between 55 - 75F, depending on how you have adjusted the vent.
Screw directly into polycarbonate panels, wood, or metal frames.

Description

Ingenious temperature-sensitive devices automatically open and close cold frame lids, greenhouse windows and even skylights throughout the day and maintain a constant interior climate, something impossible to achieve by manual adjustments. Requires no batteries or electricity, it starts opening between 55-75F, depending on how you have adjusted the vent. Strongly recommended for all our glazed season extenders because it dramatically improves plant growth. Screw directly into polycarbonate panels, wood, or metal frames. Use the Standard Vent Opener to lift up to 15 lbs, and the much stronger Gigavent, with all metal construction, to lift up to 65 lbs.

2. Wiwir Solar Heat Sensitive Automatic Greenhouse Vent Opener Auto Vent Kit for all Palram Greenhouses (Single Spring Vent Opener)

Feature

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 - 15c - 25c (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.

Description

This very smart autovent uses energy from the sun and surrounding air.
The autovents strong metal tube contains a mineral wax which expands with heat. This pushes a piston which opens the vent via a balanced linkage. As the temperature rasises, the vent will open. As the temperature drops, the wax shrinks and a strong stainless steel spring closes the vent and resets the piston.


Things to remember:

-Do not use this opener anywhere the temperature will exceed 60 (140f)
-Please ensure your greenhouse window can be opened freely by at least 45cm (18")
-Get the very best from your greenhouse plants and veggies - don't leave it to chance!

Package included:

- Automatic window opener x 1
- English manual x 1

3. Jack-Store Solar Heat Sensitive Automatic Thermofor Window Opener Greenhouse Autovent Vent Opener Standard - Lifts 15 Lbs

Feature

100% brand new and high quality.
Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops.
Simply opens and closes when the temperature changes.
Maximum opening : about 30, depending on adjustment and load ./Maximum window opening : 45cm.
Suitable for most greenhouses.

Description

Ideal for your greenhouse window--opens and closes your greenhouse window as the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating.
No batteries or electrical power needed. The liquid-filled cylinders expand as temperature increases.
Including fittings & installation manual.
Can be clamped onto or screwed onto your greenhouse frame.
Important notice:Do not use this opener anywhere the temperature will exceed 50 (122F).
Please ensure your greenhouse window can be opened freely by at least 45cm (18").
Do not apply excessive loads by locking or covering window.
Do not dismantle the cylinder.
The opener CANNOT stop by manual.

Item Specifications:
Maximum window opening 45cm
Maximum opening about 30, depending on adjustment and load
Maximum opening weight 7kg/15lb
Adjustable open temperature range 15- 25/60-77F

Package includes
1 x Automatic window opener

4. ZKer Carbon Steel Automatic Window Opener, Automatic Greenhouse Roof Window Vent Opener Lifter Solar Heat Sensitive Greenhouse Vent Opener Sets Standard- Lifts 15 Lbs

Feature

Material: Galvanized carbon steel sheet and aluminum
Ideal for your greenhouse window--opens and closes your greenhouse window
as the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating
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 50 (122F)

Description

Automatic Agricultural Greenhouse Window Opener, Solar Heat Sensitive Window Opener, Vent Automatic Window Roof Opener Set Household Tool

Feature:
Ideal for your greenhouse window--opens and closes your greenhouse window
as the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating
Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops
Including fittings & installation manual
Can be clamped onto or screwed onto your greenhouse frame
Important notice:Do not use this opener anywhere the temperature will exceed 50 (122F)
Please ensure your greenhouse window can be opened freely by at least 45cm (18") Do not apply excessive loads by locking or covering window
Do not dismantle the cylinder
The opener CANNOT stop by manual

Specifications:
Maximum window opening 45cm
Maximum opening about 30, depending on adjustment and load
Maximum opening weight 7kg/15lb
Adjustable open temperature range 15- 25/60-77F

Packages:
1 X Automatic window opener

5. Double Spring Automatic Window Opener Carbon Steel Greenhouse Window Automatic Vent Opener, Solar Heat Sensitive Window Roof Auto Vent Opener Temperature Controlled Automatic Vent Opener- Lift 15 Lbs

Feature

Material: Galvanized carbon steel sheet and aluminum, Compared with the single spring vent, the double one has stronger thrust force, more solid, and much durable
Ideal for your greenhouse window--opens and closes your greenhouse window
as the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating
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 50 (122F)

Description

Automatic Agricultural Greenhouse Window Opener, Solar Heat Sensitive Window Opener, Vent Automatic Window Roof Opener Set Household Tool

Feature:
Ideal for your greenhouse window--opens and closes your greenhouse window
as the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating
Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops
Including fittings & installation manual
Can be clamped onto or screwed onto your greenhouse frame
Important notice:Do not use this opener anywhere the temperature will exceed 50 (122F)
Please ensure your greenhouse window can be opened freely by at least 45cm (18") Do not apply excessive loads by locking or covering window
Do not dismantle the cylinder
The opener CANNOT stop by manual

Specifications:
Maximum window opening 45cm
Maximum opening about 30, depending on adjustment and load
Maximum opening weight 7kg/15lb
Adjustable open temperature range 15- 25/60-77F

Packages:
1 X Automatic window opener

6. Bewant Automatic Window Opener Thermo Solar Heat Sensitive Greenhouse Vent Opener Auto Vent Kit (Lifts 15 lbs)

Feature

Starts opening between 55 - 75F, depending on how you have adjusted the vent
Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops
As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating
Ideal for your greenhouse window--opens and closes your greenhouse window
Screw directly into polycarbonate panels, wood, or metal frames

Description


Please ensure your greenhouse window can be opened freely by at least 45cm (18")

Do not apply excessive loads by locking or covering window

Do not dismantle the cylinder

The opener CANNOT stop by manual

Maximum window opening 45cm

Maximum opening about 30, depending on adjustment and load

Maximum opening weight 7kg/15lb

Adjustable open temperature range 15- 25/60-77F

Package Included: 1set Automatic window opener

7. WElinks Carbon Steel Greenhouse Window Automatic Vent Opener, Solar Heat Sensitive Window Roof Autovent Vent Opener Standard- Lifts 15 Lbs

Feature

Material: Galvanized carbon steel sheet and aluminum
Ideal for your greenhouse window--opens and closes your greenhouse window
as the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating
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 50 (122F)

Description

Automatic Agricultural Greenhouse Window Opener, Solar Heat Sensitive Window Opener, Vent Automatic Window Roof Opener Set Household Tool

Feature:
Ideal for your greenhouse window--opens and closes your greenhouse window
as the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating
Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops
Including fittings & installation manual
Can be clamped onto or screwed onto your greenhouse frame
Important notice:Do not use this opener anywhere the temperature will exceed 50 (122F)
Please ensure your greenhouse window can be opened freely by at least 45cm (18") Do not apply excessive loads by locking or covering window
Do not dismantle the cylinder
The opener CANNOT stop by manual

Specifications:
Maximum window opening 45cm
Maximum opening about 30, depending on adjustment and load
Maximum opening weight 7kg/15lb
Adjustable open temperature range 15- 25/60-77F

Packages:
1 X Automatic window opener

8. Standard Hydraulic Cylinder Replacement for Univent, Thermovent, Optivent, Ventomax, & Sesam Liberty Window Opener

Feature

Replaces worn out Piston Rod from your J. Orbesen Teknik Brand Univent Window Openers
The core technology is the hydraulic cylinder that contains a plant-based wax
This special designed cylinder containing this wax, works as the greenhouse window openers thermostat, thus there is no need for electrical power supply
You don't need any electricity in your greenhouse; the window opener will be very environmental and CO2-friendly throughout its whole lifetime
Our renowned hydraulic cylinders replace our small range of window openers: Optivent, Univent, Thermovent, Sesam Liberty Vent, and Ventomax

Description

Replace your old (Univent, etc., Trademark) Piston Rod with genuine parts from Denmark, since 1981! Fresh from the factory, our turnover on this product is literally weeks from the manufacturer, giving you fresh wax and a dependable vent opener ready to replace your old or worn out cylinder/piston rod in these openers: OPTIVENT, UNIVENT, THERMOVENT, VENTOMAX, OR SESAM LIBERTY From the J. Orbesen Teknik Aps company out of Denmark: GREENHOUSE WINDOW OPENER replaces the J. Orbsen Teknik Openerw ONLY. REPLACEMENT CYLINDERS/PISTONS NO. 1 (W/O Thermometer). Due to many years of cooperation with greenhouse manufacturers, the installation of the cylinder is made very easy, and it fits most of our openers on the market. Apart from being used in our greenhouse window openers, the hydraulic cylinders are used in a wide variety of applications e.g. roof hatches; helicopters; power plants etc. Force push: 80 kg. Force pull: N/A. Stroke: 65 mm. Temperature, retracted: 17 C (62 F). Temperature, extended: 33 C (91 F). Color: Black INSTRUCTIONS: 1.) Place new cylinder in cool water or the refrigerator for 30 minutes. 2.) Remove old cylinder by undoing the hairpin clip and unscrewing cylinder and then check to see if your window or vent is moving freely. 3.) Reinsert new cylinder and replace hairpin in hole closest to cylinder for wider, earlier opening, or place hairpin in hole farthest away from cylinder for narrower, later opening. 4.) Adjustments: Always adjust the cylinder during a constant temperature, like middle day or middle night, so the cylinder can adjust slowly to its new settings. If you want the cylinder to open earlier/higher setting TURN CLOCKWISE. If you want the cylinder to open later/lower setting TURN COUNTER CLOCKWISE. One complete twist of the cylinder is about 1 degree, but results may vary from greenhouse to greenhouse.

9. 2 x Bayliss XL Autovent Automatic Greenhouse Window Opener

Feature

2 x Bayliss XL Autovent Automatic Vent Openers
Supplied with all fittings and Instructions, easy to install
Quality British Made Product
Full 2 year manufacturer's warranty
Please do not confuse these quality units with cheap far east copies

Description

Essential for greenhouse growing, Bayliss autovents automatically open and close hinged vents providing accurate and continuous ventilation around the clock. Using the energy from the sun the Autovents are designed to mechanically open as the temperature increases. Similarly, as the temperature lowers so do the Autovents Automatically opens and closes hinged vents. "clip-on" model lifting a load of up to 5.5kg (12lbs) giving a maximum opening of approx. 12". The unit measures 11" in length and is in a satin anodised finish. Supplied complete with all the fixings and instructions. The strong metal tube contains a mineral wax which expands with heat,this pushes a piston which opens the vent . As the temperature drops, the wax shrinks and a strong stainless steel spring closes the vent and resets the piston. All Bayliss products are guaranteed for two years against faulty manufacture. They are designed and tested to last for many years and are fully serviceable spare Parts are available.

10. Automatic Greenhouse Vent Opener

Feature

Opens and closes standard greenhouse windows automatically
Simple to fit, needs only basic DIY skills
Designed to last many seasons
UK manufacturer with over 50 years experience of autovents
Protects your plants automatically from the worst heat damage that can occur in an unventilated greenhouse

Description

Automatically opens and closes your greenhouse window as the temperature changes. Complete kit, ready to install with easy to follow instructions. Fits most greenhouses. Unfortunately if you have one of the "trapped polycarbonate" type of greenhouse which are currently being sold on the internet there is nothing for the clamps to fit onto and these units will not be suitable for you. This opener is the latest in a line of THERMOFOR roof vent openers designed and supplied over the past 50 years. This model is an attractive cost effective unit with a unique opening action, ensuring a smooth twist free operation, and with the cylinder mounted within the bracket to eliminate projection in the greenhouse. It is finished in a durable polyester powder coating and is corrosion resistant throughout. Easily fitted to Aluminium and wooden greenhouses it will lift up to 7kg (15.45 lbs), i.e a vent weighing up to 14kg (glass area not exceeding 0.75m in an aluminium frame), with a maximum opening of 35cm (14 inches). Manufactured in the UK by a company with 50 years experience of these vents - please do not compare with cheap far east copies.

Conclusion

By our suggestions above, we hope that you can found the best automatic greenhouse window opener for you. Please don't forget to share your experience by comment in this post. Thank you!

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