Greenhouse Ventilation: The Five Essential Aspects to Consider

For a fruitful harvest, regardless of the season, one of the crucial things to keep in mind is the overall health of your plants. In terms of providing your greens with the right environment for an efficient and longer growing season, greenhouses make an excellent choice. A greenhouse without a proper ventilation system is like keeping your plants in a sealed plastic bag, effectively making the growing process far more difficult than it needs to be. Hence, greenhouse ventilation is crucial in upkeeping your cultivation.

Greenhouse Ventilation

greenhouse ventilation
BillyOh Harvester Walk-In Aluminium Polycarbonate Greenhouse

Keep in mind that greenhouses are generally enclosed outdoor structures that will not ventilate entirely on their own. Installing a ventilation system is an excellent way to ensure that your plants are supplied with the proper temperature, moisture level and airflow.

Listed below are the reasons why getting the right greenhouse ventilation can help you achieve a productive greenhouse all-year-round.

1. Temperature Control

Plants tend to be sensitive when it comes to temperature. Hot temperatures can cause them to wilt, while cold temperatures can cause them to stop growing, producing, or even deep freeze. They can also be delicate to extreme swings in temperature.

With that, having adequate ventilation installed in a greenhouse can avoid these temperature concerns; allowing hot air out and cool air in – and vice versa – maintaining an even, optimum temperature.

banner content

2. Humidity Control

Just like heat, high concentrations of humidity can be accumulated within the greenhouse. Moulds, fungi and mildew are likely to occur in damp conditions. 

Moreover, if the moisture is trapped inside, this can be detrimental to the plants’ growth and development. This can also cause problems with condensation and saturation of plants. But with the right ventilation, the damp environment can be replaced with dry and cooler air, keeping the humidity at the optimum level.

3. Oxygen (CO2) Replacement

A higher concentration of carbon dioxide can help plants to be more productive in terms of their basic building blocks for growth. One of the by-products of this process is oxygen.

Just as humans would lack oxygen in a poorly ventilated area, the same thing goes for the greens. Plants utilise CO2, which is something that every greenhouse has to provide, mainly when the greenhouse doesn’t supply enough oxygen naturally.

Having said that, if a greenhouse structure is not adequately ventilated, the air inside becomes ‘saturated’ with oxygen. This will hinder the plants from acquiring the carbon dioxide they need to properly photosynthesise and grow.

Oxygen is also essential for the roots for continuous growth. Maintaining an adequate level of fresh air through ventilation, this guarantees sufficient CO2 levels for your plants.

4. Air Circulation

In correlation to the above factors, air circulation, or ‘air movement’ within a greenhouse, also serves many purposes. Proper movement of air within the environment can create uniformity in temperature, humidity, CO2 and oxygen.

Plants respond better to environmental consistency. Thus, proper ventilation ensures each plant within the greenhouse receives enough atmospheric conditions, whilst also encouraging pollination.

Many vegetable and ornamental plants – such as wheat, rice, barley, corn, and oats – are pollinated by the wind. Movement of air within a greenhouse could also be the determining factor as to whether a plant is pollinated and able to complete its reproduction.

5. Pest-Free

Poor ventilation means your greenhouse will also be more susceptible to pests, as many insects favour hot and humid conditions to lay eggs. But with proper ventilation, this will prevent pests from breeding and allowing them to enter and leave the greenhouse, providing better protection for your plants as a result.

Passive Ventilation System vs Powered Ventilation System (PVS)

A passive ventilation system has no mechanical components, which means there are no powered fans involved. Instead, the greenhouse ventilation occurs via convection, wherein heat becomes less dense and rises through the ridge vents.

The powered ventilation system, on the other hand, is run by fan and intake vents. Generally, they’re set-up with a thermostatic control that will turn on the fan when the set-point temperature has been reached.

Note: Whether you opt for a passive or powered ventilation system, ensuring your greenhouse is adequately ventilated is crucial in creating an ideal growing environment for the plants.

Greenhouses UK

BillyOh 4000 Lincoln Wooden Clear Wall Greenhouse with Opening Roof Vent
BillyOh 4000 Lincoln Wooden Clear Wall Greenhouse with Opening Roof Vent

Greenhouses are specifically designed to cultivate plant life. Here at BillyOh, we offer the most extensive range of greenhouse to suit precisely what you need.


Timber has incredible insulation properties. Wooden greenhouses are brilliant as they provide natural insulation, which helps in absorbing the rays during the day, whilst also containing the heat at night.


A metal greenhouse is guaranteed to last a long period while being nearly maintenance-free, thanks to the aluminium material it features. 


For a cheaper option, a plastic greenhouse can be your best bet. Polycarbonate is the most durable of all the greenhouse plastic. It also has a high standard of heat retention, making the chance of a polycarbonate greenhouse having a high average temperature very likely.

Greenhouses For Sale

BillyOh Polycarbonate Lean-To Greenhouse
BillyOh Polycarbonate Lean-To Greenhouse

It is true that a garden building like sheds, log cabins, and other outbuildings offer high style, escapism and versatility. Our greenhouse units are no exceptions! They’re designed with excellent craftsmanship, featuring high-quality materials. 

Our designers have worked tirelessly to produce the most extensive range of greenhouse and are unmatched by other retailers.

Like this post - why not share it?
Share on Facebook
Pin on Pinterest
Tweet about this on Twitter
Share on LinkedIn