Canopia Automatic Roof Vent Opener for Greenhouses

i built custom a lean to greenhouse and needed to attach opener to low side of roof. Works great. although i would like to be able to control interior temp (opens at 64F) to warmer temps for my seedlings, this works well for my needs. piston runs vertical rather than horizontal (as with most), so piston doesn't stick downward and get in way when i need access the plants on the shelves. I adjusted the knob for extension to as far out as i could to limit the opening. this design doesn't have to go on mfg greenhouse, can be used for other types. Easy to install. Instructions give size 1 font and 1000 languages. Instructions are not good but if you have common sense, you can figure it out. Def use the "put it in the fridge instruction". The cold causes the wax inside to contract, making it easier to position. comes with lots of configuration hardware for attachment. i just screwed directly into my frame. customer service is quick to reply if you have questions. but they said it only works on the mfg greenhouse. not true

After reading many reviews on this product on Amazon and other seller websites it was hard to tell if it was a good product or not. I decided to take a chance and after having it in place for about a month now, I am quite pleased. I live in the Washington, DC area where spring has been all over the place, from mid to high 80s to last night's record cold. This temperature fluctuation gave me the perfect opportunity to test and fine tune this device. First, I have a Poly Tex Snap and Grow (6'x8'). Poly Tex is essentially the same a Palram. When I received the kit, the instructions called for placing it in the refrigerator for 30 minutes to enable the retraction of the tube. I actually cheated and put it in the freezer for 10 minutes (just make sure it is cold and you are not forcing it). Installing it was very easy; just unhitched the manual opener and put the auto opener right back in the same place. The afternoon I installed it was quite warm. I had gone back in the house and when I came out about 15 minutes later, the vent was fully open. Over the course of the next week, I made small adjustments to the opening temperature until I got it right where I wanted it. The adjustments are made quite simply by turning the round piece at the end of the tube. Turning the piece clockwise means your greenhouse will be warmer before it starts to open. Turn it counter-clockwise if you want the vent to open at cooler temperatures. It is a big inconvenience to have to watch the greenhouse every day and run out to manually open the vent. This auto vent kit has been working perfectly so far. Now that the hot humid DC summer is fast approaching, I update this review if it fails to perform.

If you invest in a greenhouse, this accessory is a must! We installed it in our Palram greenhouse and I can’t say enough good things about the unit. It automatically opens and closes at around 68–70°. Unfortunately, you cannot adjust it to open a cooler or a warmer temperature – which for me is a drawback. The other drawback is that you cannot bypass the automatic opening and close it in the event of a storm for example, or if you want to put more humidity into your greenhouse. That said, the greenhouse warms quickly unless you are diligent enough to get up early in the morning and open the window manually. It should be noted however that this unit is NOT The one to use with the Palram side louver window. That is a completely different unit which functions the same but is built differently. Overall, I rated this unit four stars because it functions as it should and is worth the money for that reason. It could be improved upon if you could easily bypass the open and close, and perhaps also if you could adjust the open and close temperature a bit.

This is the second time I’ve used this automatic window opener for my new greenhouse. I used it in my first greenhouse, a Palram. It’s clearly the easiest to install with a variety of hardware to suit your setup and is totally reliable. I foolishly installed a different brand this time and took it out and ordered this again. The range of motion on it makes it so functional, which other models don’t have. Don’t forget to put the hydraulic tube in the freezer for about 30 minutes prior to installation, which makes it easy for you to get it installed before it warms up and starts working.

After a few adjustments/calibrations (and a little patience) the auto vent works great! Initially the vent opener was not working as expected. However, after reading people's reviews and recommendations on Amazon.com we were able to make the necessary adjustments. One of the most valuable tips we read was to place the vent in the freezer vs. the refrigerator as the manufacturer's instructions state. The day the auto vent opener was installed it was 75-80 degrees. By the time the vent opener was being installed (straight from the refrigerator) it was heating up too fast. Placing the vent (flat) in the freezer for 30 minutes made it work fine. The day after installing the vent we had temperature ranges from 75 to 29 degrees; the vent opener worked perfectly! This will truly make life easier--and happy plants in the greenhouse!! After having my greenhouse for 4 1/2 years it has withstood 110 degree temperatures, 4 inches of snow, 55-60 MPH winds, and I still quite happy with my purchase. I would recommend pouring concrete at the four corners to stabilize/secure the greenhouse, as we did. Additionally, I would recommend purchasing two auto vents for extra ventilation.

The auto vent opens at approximately 20 C and closes 15 C. Very impressed with the operation control to date

Works as intended. Yes, a bit of a challenge to install (Like any similarly fastened products). Worth the investment!

Works great! Opens at about 25 Degs, direct sun. You might find that to calibrate to different operating temperatures a bit limited.

Easy to install worked first time easy adjustments Dislike bolts holding mounting plates as they are 5mm too short

Stopped working in the first. I even bought another because the fitting was the same. I quit also. Garbage.