Call us 0800 800 880

Evergreen Greenhouse Automatic Vent Opener

Pre-order now, new stock arriving 2 Jul


Evergreen Greenhouse / Glasshouse Auto-Opening Vent.

Read more
15 people have this in their cart
Product overview

Product overview

Evergreen Greenhouse / Glasshouse Auto-Opening Vent.

Top quality product backed by our 12 month warranty. Thermostat mechanism, automatically opens and closes the vent at a set temperature.

Its automatic operation adjusts the ventilation as temperature changes, allowing for optimal air flow in your greenhouse. No more worrying about your flowers and plants, even when you're away.

There's no need for troublesome cables or regular battery replacements.

- Starts to open at 18-25°C
- Fully open at 35°C and above
- Maximum extension of 45cm
- Maximum open weight 7kg

Similar models from other suppliers come in at $130+

Weight: 1kg
Packed carton size: 8.5cm x 5cm x 28.5cm

Average thickness of aluminium profiles: at least 1.5mm


Can we help?

Our friendly and knowledgeable gurus are trained to answer all your questions as quickly as possible. So if there’s anything you need to know just give us a call during business hours, or send us an email any time.

0800 800 880
Customer questions

Questions and answers

10 votes
q: What powers the automatic vent opener?
a: It acts like a thermostat, the piston contains a mineral wax that expands when heated, opening the window. As the temperature drops this contracts and, with the help of the spring, closes the window.
By Trade Tested on April 1, 2019
1 vote
q: Will this work on the louver windows style the one that has 4 or so blades of glass?
a: Yes most likely.
By Trade Tested on February 2, 2021
1 vote
q: Would this work on other brands of greenhouses? Are they pretty standard sizes?
a: Yes should do.
By Trade Tested on May 4, 2020
0 votes
q: Hi, does it have one or two springs?
a: It has 1 spring.
By Trade Tested on October 12, 2020
0 votes
q: Can the device be bypassed, ie opened manually without much effort?
a: Not easily, you would need to remove a actuator rod.
By Trade Tested on October 7, 2020
0 votes
q: Can the opening temperature be regulated or is it permanently set. Thank you.
a: No it is permanently set (it's a mercury switch).
By Trade Tested on September 2, 2020
0 votes
q: Is it aluminium or steel? thanks!
a: It's aluminium.
By Trade Tested on June 10, 2020
0 votes
q: Hi, can i install it on a regular window?
a: Sure, if it's not too heavy.
By Trade Tested on May 25, 2020
0 votes
q: Do you sell replacement wax cylinders for these?
a: No we don't.
By Trade Tested on May 22, 2020
Customer reviews

Customer reviews

Overall rating

4.6 out of 5 stars from 50 reviews
Rny Southland


4 months ago


Exactly what I needed, and easy to install.

Grumpy Gran Canterbury

Oh Dear!

5 months ago


This was a Christmas gift for my husband which he assembled earlier than Christmas. We have not been able to make it work, despite trying very hard and checking with the instructions. It just does not work. Great idea and principle but... So sadly not able to give a helpful review.

Reply from Trade Tested

These units start to open between 18-25°C and fully open at 35°C and above, discussed instructions for operation with customer and they are happy with the product.
Naomi Waikato

Does the trick

6 months ago


Bit hard to install on the evergreen greenhouse.

Andy Tauranga

Great addition to the greenhouse

6 months ago


The opener works a treat....definitely a must to get with the greenhouse.

Finlay Banks Canterbury

Great product

6 months ago


A must for all green houses. Easy to fit. No more worries about venting and over cooking the plants. Highly recommended.

John new plymouth

very good product

6 months ago


Had first one for 4 years. Fitted new one and working well. Recommend this product

Popa smuf Nelson

Automatic vent opener

7 months ago


Works very well good buy.

Browntrout Otago

Must have.. Auto Opener

7 months ago


If you have a greenhouse these Auto Opener are a 'must have'You dont have to worry about opening and shutting those vent windows by hand, these open and close by temperature to vent the Greenhouse.

Xxx Christchurch

Window opener

8 months ago


Does exactly what it says and without it our plants would have died multiple times already.

Keith Cambridge

Evergreen Greenhouse Automatic Vent Opener

8 months ago


These are amazing. Open and close and stop greenhouse from over heating.

Lili Ashburton

Very good

10 months ago




Auto vent opener

11 months ago


Works well, and reasonably easy to fit to green house.

Johnny Wellington

Auto vent opener

about 1 year ago


Opens and closes as designed

Benjamin Auckland

Works well

about 1 year ago


Good product works well, however the instructions are pretty bad so it took a while for me to figure out how to install properly. With better instructions I would give a 5 star rating.

George Opotiki

Auto vent

about 1 year ago


Great product, Just connect it up and walk away.

Hutch Wellington

auto vent opener

about 1 year ago


made it harder for myself by installing the normal opener first = instructions difficult to understand but it works great

Kes Hawke's Bay


about 1 year ago


Does what it said it would.

Rossco Rotorua

Evergreen auto vent opener

about 1 year ago


Works great, happy with purchase and recommend it

The Old Trout South Island

Vent Opener

about 1 year ago


Found them to be fairly useless.

Glasshouse Man Hamilton

Evergreen Greenhouse Automatic Vent Opener

over 2 years ago


Installed and operating ideally

Odin Putaruru

vent opener

over 2 years ago


it works fine easy to install i put 2 in my green house.

Sam Otago

Very happy

over 2 years ago


Works incredibly well even on our very windy section. I used nuts and bolts to secure it to the glasshouse instead of the screws supplied in the kit. I would certainly purchase another if I needed it

Chris Hawke's Bay

Evergreen Greenhouse Automatic Vent Opener

over 2 years ago


Easy to install and work very well.

Chris Pearson Blenheim

Evergreen Greenhouse Automatic Vent Opener

over 2 years ago


Great unit easy to install and works perfectly

Vajira Wellington

Excellent product

over 2 years ago


This automatic vent opener is a excellent product and working as advertised. Recommend for everyone.

Robbo Wellington

brilliant product

over 2 years ago


have installed two of these on my greenhouse, absolutely awesome system & Trade Tested were great with support, when I had a minor issue , thanks Guy's.

Mat Otago

Greenhouse window opener

over 2 years ago


Great product, works perfectly. I bought 4 to use in my custom built glasshouse. I had to make a custom bracket to hold the opener, easy though, and works a treat

Keith W Bay of Plenty

Evergreen Greenhouse Automatic Vent Opener

over 2 years ago


Won at ( Trademe ) auction for a good price, totally stoked with the installed product A+++

Vic Northland

Auto vent opener

over 2 years ago


Working well.

Pat Taranaki

Automatic Vent Opener

over 3 years ago


The instructions were a bit confusing but after fitting it as I felt it should be, the opener works superbly. Reccomended

Steve Otago

Automatic vent opener

over 3 years ago


Good product but smell way to override with conventional handle would be good.

Rick Auckland

Great Product works well

over 3 years ago


Great product, works very well.

Bob Waihi

Excellent product

over 3 years ago


works exactly as I hoped. Fully closed at 20 degrees C and fully open over 30. A little bit fiddly to install. Don't use a high speed drill to drill out the rivets. A slower speed battery drill with a 4mm bit is much better. Use rivets to fit the adjustor to the window rather than the self tappers supplied as they are too long. The other end is easy just using the two captive bolts from the manual system. Adjustor screws in or out to adjust but I did have to screw in to the limit. Check at various temperatures and don't forget to remove the cotter pin.

Russell Otago

Greenhouse Vent Opener

over 3 years ago


Great!!! A bit fiddly to install but so worth it. Wish we'd added them when we bought the greenhouse a few years back.

Peter Wellington

Auto window opener

over 3 years ago


Cleaver little item that works well

Al southland

glasshouse automatic vent

over 3 years ago


great product.

Thommo Renwick

auto vent openers

over 3 years ago


the auto vent openers are great just fit them and walk away.

Bully Otago

excellent product

over 3 years ago


This auto opener is sturdy and easy to install. Good value and a game changer for the green house.

Roly Hawkes Bay

Save your plants

over 3 years ago


A great device, well worth the cost. Relatively simple to install. You never forget to open your vents again.

Elle Wellington

Well worth it!

over 3 years ago


A simple and very easy to install device that works fantastically. Really nice to buy something that performs just as advertised.

Mama G Christchurch

Evergreen Greenhouse Auto vent opener

over 3 years ago


Great product, highly recommend.

JonPierre Rangiora

Evergreen Greenhouse Automatic Vent Opener

over 4 years ago


Working really well, saves having to remember to open and close. Would definitely recommend to a friend.

Mitch Christchurch

Does a great job!

over 4 years ago


Fitted and working, no problems.

Chas Canterbury

Works great

over 4 years ago


I would definitely buy one again

Paul Otago

Trouble free

over 4 years ago


These are a great addition to my hot house, trouble free and reliable

Bill Wellington

inituitive design

over 5 years ago


Excellent product that worked well on my new greenhouse.

AJ Canterbury

Must Have!

over 5 years ago


These are simply the best you really need one for each window.

Farmer Otago

Work really well

over 5 years ago


Had two operating for the last two seasons that was my reason for three more 

Wes Gisborne


over 5 years ago


Installed auto vent when I built the greenhouse. The unit did not fit right out of the box I had to make some bits to mount it so it can close properly, but once on it works very well, well worth it

Mobychev Auckland

Simple and brilliant

over 5 years ago


Best investment i have made, saves burning a lot of plants.Very reliable too.

Related categories