The 5 Best Automatic Vent Openers

Automatic Vent Openers

Automatic vent openers are ideal solutions for venting greenhouse windows, cold frame lids as well as skylights- automatically opening them to help control the climate and temperature.

Many of the automatic vent openers that we examine below are capable of being screwed directly into panels of polycarbonate, metal frames as well as wood.

A great way of preventing greenhouses from overheating, the Univent, which is our top choice, does not require any batteries or electricity to operate- it will automatically start opening in temperatures between 55 and 75°F, depending on how you have customized the vent.

Our Top Pick: The Univent Opener

  • Solar vent opener can lift up to 15 lbs
  • Will begin opening between 55 - 75°F- this will depend on how you have configured the vent.
  • Will screw directly into wood, polycarbonate panels, or metal frames.

The Univent is temperature-sensitive that will automatically open and close cold greenhouse windows, frame lids, and even can work with skylights. This helps to maintain a consistent interior climate during the day, something that is nearly impossible to perform by tedious, manual adjustments.

The Univent doesn't require any electricity or batteries- it will start opening between 55—75°F, depending on how you have adjusted the vent. Let's take a look at five of the best-selling automatic event openers on the market today.

Automatic Vent Openers Compared

ImageVent OpenersPriceOur RatingWeightDimensions
The Univent Automatic Vent Opener$$4.513.6 oz14.8 x 3.8 x 2 inches
The Sumnacon Solar Heat Sensitive Automatic Greenhouse Vent Opener Kit (for all Palram Greenhouses)$3.91.2 lbs15 x 4.6 x 2.2 inches
The TruePower Univent Automatic Vent Opener$$4.71 lbs14.5 x 3 x 2 inches
The Yosoo Solar Heat Sensitive Automatic Thermofor Window Opener Greenhouse Autovent Vent$3.412 oz14.6 x 3.9 x 2.2 inches
The Auto Vent Kit (for all Palram Greenhouses)$$3.81 lbs16 x 3 x 3 inches

The 5 Best Automatic Vent Openers 

1. The Univent Automatic Vent Opener Review

Effectiveness

Price

Ease of Use

The Univent Automatic Vent Opener has the ability to lift 15 pounds and users find it as advertised in terms of its ability to work on its own without any power. Univent buyers generally appear to be happy with their purchase, especially those concerned with the issues of their greenhouses getting hotter. Univent users feel that they have been ridden of this hassle.

Some users talked about having installed it on wooden windows and mentioned requirement of purchasing specialized screws for this purpose. The company offers standard parts for the greenhouse and the rest have to be arranged. Other Univent buyers users felt that they had to go through the instructions quite a few times in order to truly understand them but the process felt quite easy to them.

Another user appeared quite happy with the adjustment option for the opening and temperature. One user required aluminum for his parts and felt that the opener was easily stripped particularly when it came to deposits of hard water. This user advised to utilize grease for protection of the threads before usage.

Installing the Univent

2. The Sumnacon Solar Heat Sensitive Automatic Greenhouse Vent Opener Review

Effectiveness

Price

Ease of Use

The Sumnacon Solar Heat Sensitive Automatic Greenhouse Vent Opener was generally appreciated by its users for its reasonable pricing. Users felt that it was simple in terms of installation and worked in a range of temperatures. According to a user, the loaded spring arm opens up due to force whenever the temperature goes up. It was advised that the bracket should be installed without the presence of the cylinder and the latter should be installed after full extension.

The item stops to function whenever it gets dark apart from whatever the temperature is, which is appreciated by the customers. According to a customer, different competing brands of Sumnacon Solar are well suited for applications that require more wind but this particular model is good in case of combinations with stronger designs of openers. The adjustment ease offered by the opener is generally the favorite feature, as observed by its customers. The Sumnacon does lack somewhat when it comes to the hardware and brackets of adapters that are used for universal installation.

One user reported to have used the product for six continuous months without occurrence of any problem. Another user complained of missing fitting bolts along with narrowed window bracket slots which made it hard for them to drill the slots out. Its functioning, once up and running, was nevertheless appreciated and a quality fitting was eventually achieved. Another user complained about having to make a lot of changes in their window because of the unavailability of fitting bolts.

3. The TruePower Univent Auto Opener Review

Effectiveness

Price

Ease of Use

The TruePower Univent Automatic Vent Opener has many fans. One customer was apparently using it for starting up their garden seed with the help of a hotbed. The customer loved its smooth operation, especially in the unpredictability of spring climates. Users write that they don't have to constantly monitor the hotbed- eliminating a ton of daily hassle. 

4. The Yosoo Solar Heat Sensitive Automatic Thermofor Window Opener Review

Effectiveness

Price

Ease of Use

The Yosoo Solar Heat Sensitive Automatic Thermofor Window Opener has received complaints from some of its users. Some customers explained that it failed after an hour of operation, having sprayed oil over the greenhouse. The customer was quite upset regarding Vendor’s refusal for any refund. Moreover, the assembly was criticized as well for being especially challenging. Another customer found the product to be working according to what was advertised by the company. So, this one is somewhat of a toss-up. It will depend on your particular installation requirements and whether Yosoo has improved its design. Probably not a good buy. 

5. The Auto Vent Kit For Palram Greenhouses Review

Effectiveness

Price

Ease of Use

This Auto Vent Kit, which is designed for all Palram Greenhouses, received a combination of both good and bad reviews. The product had the ability to last in a range of temperatures and was adjustable as well. According to the user, the instructions required to place it in the refrigerator for a good thirty minutes for enabling the tube retraction.

The installation was apparently quite easy and simple. One user explained their experience by mentioning the fully open vent about fifteen minutes post the installation. The user posted about making minor adjustments in the opening temperature until the desired result was not produced. The ease of making adjustments was appreciated by the user and ways to make the greenhouse warmer were discovered by them. The user suggested turning the product counter clockwise in case of having the opening of vent at cooler temperatures.

A user explained their experience to be quite pleasurable. According to the customer the arrival was prompt and the installation process was quite simple owing to the availability of necessary tools. The directions have to be read carefully and the rest is a simple process. The user suggested that the auto vent should be chilled before installation. The variety of fasteners offered by the product for different greenhouse models was appreciated. Modification was easy and the aluminum offered ease of drilling.

The user has a specific case in which they had to adjust the unit till the thread’s end in order for it to start properly working. The user suggested need of improvements in the design particularly if another thread inch could be offered on the piston.The unit was said to be working with quite reliability and offered easy opening and closing at different temperatures.

Extra ventilation was suggested by the user to help keep the greenhouse from getting too hot on summer days. Protection was assured in case of cooler days and with the additional improvements the unit can be reattached and detached with ease without using any bolts or screws. 

Installing an automatic greenhouse vent opener

Final thoughts

As we have seen, automatic vent openers are great way to maintain a comfortable and healthy climate in greenhouses, with some users even installing them on skylights to get a little fresh air in their own homes. That said, they can be a little tricky to install sometimes, depending on your particular requirements. But, with a little bit of ingenuity, patience and reliance on the instruction manual and YouTube videos, you can certainly figure out how to get an automatic vent opener working for you.

If you are looking to purchase an automatic vent opener, we recommend the Univent opener- but make sure you read the comparison table above and all of the reviews that we have assembled on this page in order to make an educated decision when purchasing an automatic vent opener. We should also again noted that the some of the auto events are designed for specific greenhouses-like the Palram auto vent kit.


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