How To Adjust Greenhouse Vents (Easy Fix)

Greenhouses are an excellent way to grow plants in colder weather. They also help you control the humidity and temperature of your environment, which is especially important for indoor plant growth. 

But greenhouses can be tricky: if you don’t ventilate them properly, they can become stuffy and hot, hindering plant growth. 

Luckily, there are several ways to adjust greenhouse vents depending on the season and your needs!

Greenhouse Autovents not working
Adjusting greenhouse vents is an important aspect of maintaining a healthy greenhouse environment.
Proper ventilation helps regulate temperature, humidity, and air circulation in the greenhouse.
Regularly adjusting greenhouse vents ensures optimal growing conditions for plants.
Understanding the different types of greenhouse vent openers and their mechanisms is essential for effective adjustment.
Follow proper safety precautions when adjusting greenhouse vents and seek professional assistance if needed.

Use A Thermometer And/Or Hygrometer

When you’re adjusting the vents in your greenhouse, it’s helpful to use a thermometer and hygrometer. 

A thermometer will give you an accurate reading of the temperature, which can help determine what kind of adjustment is needed.

A hygrometer will tell you how humid it is inside your greenhouse and whether or not adding more ventilation will help reduce the humidity level.

When it comes to ensuring the stability of your greenhouse, anchoring it to the ground is crucial. Our guide on how to anchor a greenhouse to the ground provides easy-fix solutions and valuable tips to keep your greenhouse secure and protected against external factors.

Use The Flow Of Air To Maintain The Temperature

There are several ways to maintain the temperature and humidity of your greenhouse. The first thing you need to do is make sure that you have adequate ventilation in your greenhouse. 

This will help keep the temperature low and make sure that plants are receiving enough oxygen, which can be very important for plant growth.

There are several types of vents available including:

Sliding vent: These are made from plastic or metal and slide along an overhead track system allowing you to open up as much or as little area as needed. 

They tend to be good at maintaining temperature, but not so good at controlling humidity levels or circulating air through the room

Roller shutter: This type is designed with slats that roll up when opened, which allows them to be opened wide enough for people or large equipment like tractors through them without taking up too much space on either side of them (which can cause issues if they get stuck). 

Roller shutters typically operate very smoothly and stay closed while they’re not being used so they don’t take up too much energy from just sitting around waiting for someone else’s convenience (meaning yours!). 

These types work well because they allow plenty of airflow but still provide some privacy when needed so this is one option worth considering if privacy isn’t something critical for growing purposes since these aren’t nearly as expensive either!

Check The Weather Forecast

Before venting, make sure you have the right information available to you. Weather forecasts are especially important since they help you know when to vent or close vents based on what the weather is going to be like. 

You can get these forecasts online or from a local radio station. If you’re not sure where to find one, we recommend checking out The Weather Channel and searching by zip code or city.

Maintaining the ideal temperature in your greenhouse is essential for successful plant growth. Our comprehensive guide on adjusting greenhouse temperature offers easy-fix methods and expert advice to help you create the optimal climate conditions for your plants.

Use Fans

Fans can be used in a greenhouse to increase air circulation, movement, and circulation. If you want to keep your plants healthy, it’s important that they get enough oxygen. 

The best way to do this is by using fans. You can also use fans in combination with other methods such as vents, windows and vents (windows).

Shade Your Greenhouse Structure Or Plants

To protect your greenhouse structure:

Use shade cloth, shade netting or shade netting to reduce the amount of sunlight that can enter your greenhouse. This will help keep it cooler inside.

You might want to use this for plants that you don’t want any wind blowing around, like tomatoes and other herbs.

Circulate The Air In Your Greenhouse

When you’ve got air circulating in your greenhouse, it’s time to watch the plants thrive. You’ll have to keep an eye on them every once in a while, but if you focus on watering and providing fertilizer when necessary, you’re doing everything right.

Your greenhouse will be the envy of your neighborhood; people will be lining up just to buy some fresh basil or tomatoes from you. 

Hang out with them for a while and tell them all about how great life is now that you’ve got this new greenhouse set up!

During colder months, adding heat to your greenhouse becomes necessary to protect your plants from frost and ensure their well-being. Discover the easy way to add heat to a greenhouse with our practical guide, providing valuable insights and recommendations for effective heating solutions.

Insulate Your Greenhouse In Colder Weather

If you have a greenhouse and you live in a cold climate, the number one thing that can help keep your plants healthy is insulation. 

Insulating your greenhouse will reduce the amount of heat lost through its walls and roof, which means it will take longer for temperatures inside to drop below freezing. 

The best way to do this is by wrapping the outside of your structure with an insulator such as plastic sheeting or blankets made from recycled materials like old newspapers or hay (see photo). 

If there are unheated areas around your greenhouse such as walkways or doorways where cold air may seep in from outside, make sure these are covered well with insulators too!

If covering the entire exterior of your building isn’t possible due to space restrictions or other issues like water damage from rainstorms during winter months when the soil freezes quickly after snowfall melts away before reaching ground level because there aren’t any leaves left on trees yet–the next best solution would be using insulation materials like straw instead so they’re easy enough get at without tearing down every bit first.

Maintains consistent temperature
Protects plants from frost and cold drafts
Reduces heating costs
Extends the growing season
Provides a more stable environment for plants

Group Plants Together

Group plants together that flower at the same time.

Group plants that have similar light and temperature requirements.

Group plants according to their water needs.

Group plants according to cultural requirements, such as pruning frequency or fertilizer needs.

Group plants according to pest and disease problems if you’re trying to control them by moving the pests out of one area of your greenhouse (see Moving Pests).

Open Windows Or Vents When Venting Is Not Necessary.

The best time to vent your greenhouse is when it’s above freezing. If the temperature outside is below freezing, close the vents and open them again when it rises above freezing.

When you’re venting a greenhouse that uses passive heating, which doesn’t require electricity or gas for operation, it’s important to keep in mind that opening windows or vents will allow heat from inside to escape into the colder air outside. 

You can counteract this by covering windows with plastic sheeting before venting and keeping an eye on temperatures in order to make sure nothing gets too cold or damaged by exposure.

Enhancing plant growth in your greenhouse involves more than just temperature control. Our informative article on adding CO2 to a grow tent explains the benefits of CO2 supplementation and provides expert advice on optimizing CO2 levels for improved plant productivity and health.

Venting During Winter Months.

The first thing to consider when venting your greenhouse is the season and time of day. During winter months, you may want to use a ventilator to help keep the greenhouse warm. Alternatively, during summer months, you can use a ventilator to help keep the greenhouse cool.

Venting will also help keep your greenhouse dry or moist depending on what kind of environment you want in there. 

A dry environment prevents mold from growing on plants while a moist one promotes growth but also attracts insects like aphids or spider mites which damage crops so be careful not too overdo it with ventilation!

It’s important when using a ventilator that you control how much air gets pushed into the enclosure so that it doesn’t become too cold/hot for whatever plants are growing inside there

Don’t Forget About The Humidity

You can’t forget to adjust the vents in your greenhouse if you want to keep humidity levels at an ideal level. Humidity is a major factor when it comes to greenhouse ventilation, and it’s important for plants and people alike. 

Too much humidity can cause mold or fungus, which is bad news for your plants. Too little humidity can cause wilting and drooping leaves on otherwise healthy-looking plants, too!

Adjusting the vents of your greenhouse will help control the amount of moisture in its atmosphere by letting more or less air into the space via gaps at each end of each opening (also known as slits). 

You should close these gaps when there’s no need for extra airflow—like during a rainstorm and open them up whenever you feel like things are getting too hot and dry inside.

Benefits of Humidity
Provides necessary moisture
Promotes photosynthesis
Supports transpiration
Helps prevent plant stress
Encourages healthy growth

Make Sure Vents Open Easily

The vents should be easy to open and close, but not so loose that they fall off. If your vents are difficult to open or fall off, consider adding a small amount of silicone or hot glue to the inside edge of each vent pipe.

Monitor Greenhouse Temperature As Ambient Temperature Drops.

As the temperature drops outside during the winter, it’s important to monitor your greenhouse temperature and adjust as needed. 

If you have a thermometer that allows you to read the temperature inside your greenhouse at a glance, you can use this to help determine whether or not it is too cold in there.

If it’s too cold for comfort (like below 40F), then open up some vents on an angle so that warm air from indoors can circulate into the greenhouse. 

If it is getting uncomfortably warm (like above 50F), close off some vents and let cool air seep in through cracks like windows and doors. Remember: if in doubt about which direction to go with your vents, err on the side of caution!

Proper ventilation is essential for maintaining a healthy and thriving greenhouse environment. Learn how to effectively adjust greenhouse window openers with our easy-fix techniques and expert guidance in our comprehensive guide on adjusting greenhouse window opener, ensuring optimal airflow and temperature regulation.

Water Plants In The Morning

Watering plants in the morning, rather than the evening, is a good habit to get into. This way, you’ll be able to check on your plants and make sure they have enough water throughout the day (you can also check at night).

If you follow this tip, you’ll find that your greenhouse has less wasted water because it will no longer be sitting around in puddles or dripping out of leaks. And what are some other benefits? Well…

Time of DayBenefits
MorningPromotes healthy growth and absorption
AfternoonProvides hydration during hot weather
EveningAllows water to soak into the soil overnight

Allow Enough Ventilation For Plant Growth

Venting is one of the most important factors in maintaining healthy greenhouse plants. Ventilating is not the same as venting, however; ventilation refers to the process of exchanging air between your greenhouse and its surroundings.

Venting is removing warm, moist air from inside a greenhouse so that it can be replaced with cooler outside air.

When you’re growing plants indoors, it’s important to keep them at an ideal temperature not too hot or too cold. 

If your heaters aren’t working properly or if they’re broken altogether, then they won’t provide enough warmth for your plants’ growth cycles at night. 

In this case, you’ll have to rely on natural sunlight during winter months when nights get particularly chilly outside so you don’t risk damaging any buds by exposing them to freezing temperatures overnight!


We hope this article has helped you learn how to adjust your greenhouse vents. It is important not just for your plants, but also for yourself. 

The last thing you want is for something bad to happen because you didn’t take the time to read up on what could potentially happen with improper venting techniques. If anything here seems confusing or unclear, please let us know and we can help!

Further Reading

Here are some additional resources for further reading on adjusting and maintaining automatic greenhouse vent openers: Greenhouse Auto Vent Maintenance & Repair: This website provides valuable insights into maintaining and repairing automatic greenhouse vent openers, ensuring their optimal functionality throughout the seasons. How to Fit and Adjust an Automatic Greenhouse Vent Opener: This blog post offers a step-by-step guide on fitting and adjusting an automatic greenhouse vent opener, providing practical tips and advice for successful installation. How to Fit an Automatic Greenhouse Vent Opener: Gardeners World provides a comprehensive guide on fitting an automatic greenhouse vent opener, offering detailed instructions and helpful tips for a smooth installation process.


Here are some frequently asked questions (FAQs) about adjusting and maintaining automatic greenhouse vent openers:

How often should I adjust the greenhouse vent opener?

The frequency of adjusting a greenhouse vent opener depends on various factors such as weather conditions and the specific needs of your plants. It’s generally recommended to monitor and adjust the vent opener regularly, especially during temperature fluctuations.

How do I know if my automatic vent opener is functioning correctly?

To ensure your automatic vent opener is working properly, check for smooth and gradual operation when the temperature changes. Observe if the vent opens and closes as expected, maintaining the desired temperature inside the greenhouse.

What are common issues that can occur with automatic greenhouse vent openers?

Some common issues include the vent opener becoming stuck, not opening or closing fully, or failing to respond to temperature changes. These problems can be caused by mechanical issues, obstructions, or incorrect installation.

How can I troubleshoot and repair a malfunctioning vent opener?

First, check for any visible obstructions or debris that may be preventing the vent opener’s proper operation. Ensure that the vent opener is securely attached and correctly adjusted. If the issue persists, refer to the manufacturer’s instructions or seek professional assistance.

Are there any safety precautions I should take when adjusting or repairing a greenhouse vent opener?

Yes, it’s important to prioritize safety when working with a greenhouse vent opener. Follow the manufacturer’s guidelines, use appropriate tools, and avoid applying excessive force. If you’re unsure or uncomfortable with any aspect of the adjustment or repair process, it’s advisable to consult an expert or professional.