How Does a Greenhouse Work in Summer

How Does a Greenhouse Work in Summer? A Comprehensive Guide

When I walked into my grandma’s beautiful garden on a hot summer day, I instantly felt the warm, sticky air wrap around me like a hug. The garden was bursting with colorful plants that didn’t seem bothered by the blazing sun. I admired the healthy tomato vines, the thriving herbs, and the vibrant flowers that adorned every nook and cranny. That’s when I discovered the secret to this thriving paradise: the greenhouse.

I was curious about how my grandma managed to grow so many plants all year long, so I decided to learn about her greenhouse. How did it handle the blazing summer heat and keep plants healthy? Come with me to explore the world of greenhouses and discover how they do their magic, especially in the hot summer months.

In the summer, a greenhouse functions by regulating temperature, optimizing sunlight, and controlling humidity to create an ideal environment for plant growth. It uses insulation, ventilation, and shade cloth to manage temperature, while ensuring plants receive adequate sunlight and water through automated systems. Pest and disease control measures are also employed, making greenhouses versatile structures for plant cultivation in various weather conditions.

How Does Temperature Regulation Work?

How Does Temperature Regulation Work

Temperature regulation lies at the heart of a greenhouse’s functionality during the scorching summer months


Insulation in greenhouses is essential to maintaining stable temperatures, especially during cooler nights in the summer.  Moreover, greenhouse materials, such as glass or plastic, have good insulating properties that trap heat inside the structure.

At night, when the external temperature drops, the insulation prevents excessive heat loss, creating a warmer and more consistent environment for plants. In addition, double layered glazing or bubble wrap insulation can be added for even better insulation, increasing energy 



Ventilation is crucial for preventing overheating during hot summer days. Greenhouses are equipped with roof vents, side vents, or exhaust fans that can be manually or automatically opened.

However, when the internal temperature rises too high, these openings allow hot air to escape, while drawing in cooler outside air. Adequate ventilation also helps control humidity levels by allowing moisture-laden air to escape, preventing heat stress in plants.

Furthermore, automatic ventilation systems can be set to open and close based on preset temperature and humidity levels, ensuring a consistent climate.

How Does Sunlight Utilization Occur?

Unlocking the secret behind a greenhouse’s ability to harness and optimize sunlight during the summer, offering a haven for plants to flourish under the intense sun’s rays

Transparency of Greenhouse Materials:

Greenhouse materials are selected for their ability to transmit sunlight effectively. Common choices include glass, polycarbonate, and polyethylene film. Moreover, these materials allow sunlight to pass through while creating a semi-enclosed environment, which prevents the escape of radiant heat.

Furthermore, the transparency of the materials is carefully calibrated to ensure that plants receive the necessary spectrum of light for photosynthesis, which is essential for plant growth.

Greenhouse operators may choose different materials depending on factors like light diffusion, insulation properties, and cost.

Filtering out Harmful UV and IR Rays:

Greenhouse materials are designed to filter out harmful ultraviolet (UV) and excessive infrared (IR) rays from sunlight. Additionally, UV radiation can be damaging to both plants and humans, and excessive IR radiation can cause overheating.

By filtering out these unwanted components, greenhouse materials create a more comfortable and growth-friendly environment for plants. In some cases, shading materials or films may be used to further regulate the amount of sunlight and protect plants from being scorched or stressed by intense summer sunlight.

How to Achieve Effective Moisture Control?

Effective moisture control within a greenhouse during the summer months is a critical factor in maintaining a thriving plant ecosystem

Humidity Management:

Managing humidity is vital in a greenhouse during the summer when high temperatures can lead to elevated humidity levels. Moreover, high humidity can cause plant diseases, mold growth, and hinder the plant’s ability to transpire and cool itself.

Greenhouses use a combination of natural and mechanical methods to regulate humidity:

  • Natural ventilation: This allows moist air to escape and be replaced with drier outside air.
  • Exhaust fans and ventilation systems: These are equipped with humidity sensors to activate when humidity levels rise beyond a set threshold.
  • Shade cloth: By reducing the intensity of sunlight, shade cloth can indirectly help manage humidity, as excessive sunlight can cause rapid evaporation and increase humidity levels.

In some cases, greenhouse operators may use dehumidifiers to actively lower humidity levels when necessary.

Use of Evaporative Cooling Systems:

Evaporative cooling systems are commonly employed in greenhouses during hot summers to lower both temperature and humidity. Additionally, these systems involve the controlled release of water vapor into the greenhouse environment.

Water is pumped over pads or through a misting system, and as it evaporates, it cools the surrounding air. Moreover, this cooled air helps regulate the temperature inside the greenhouse while increasing humidity levels in a controlled manner.

Evaporative cooling is energy-efficient and can be adjusted based on temperature and humidity requirements, making it an effective method for maintaining a favorable microclimate for plants.

What Is Shade Cloth and Its Benefits?

Shade cloth, a valuable ally in greenhouse gardening during the summer, provides an array of benefits that help shield plants from excessive heat and sunlight.

Purpose and Usage:

Shade cloth is a woven or knitted fabric designed to provide shade and reduce the intensity of sunlight in a greenhouse. Furthermore, it is typically made from materials like polyethylene, and the degree of shading varies depending on the fabric’s density and color.

Shade cloth serves several purposes:

  • Preventing sunburn: Excessive sunlight can cause sunburn or heat stress in plants. Shade cloth provides protection by reducing the amount of direct sunlight reaching plants.
  • Temperature regulation: By blocking sunlight, shade cloth helps maintain a cooler and more comfortable environment inside the greenhouse.
  • Light diffusion: Shade cloth diffuses light evenly, reducing the risk of uneven growth and shading for plants.

Protecting Plants from Excessive Sunlight:

During the summer, when sunlight intensity is high, shade cloth is crucial for preventing plant damage. The choice of shade cloth density (e.g., 30%, 50%, 70%) depends on the specific light requirements of the plants being cultivated.

Shade cloth can be manually or automatically deployed based on the greenhouse’s microclimate and the needs of the plants. Moreover, it is especially useful for delicate or light-sensitive plants that can be susceptible to leaf scorching or heat stress in direct sunlight.

How Can Benefited Using Watering Systems?

Watering systems are the unsung heroes of greenhouse gardening, offering a multitude of benefits that enhance plant health and overall efficiency

Automated Irrigation:

Automated irrigation systems are essential in greenhouses to ensure plants receive the right amount of water consistently. Furthermore, these systems can be programmed to deliver water at specific intervals or in response to environmental sensors that measure soil moisture or plant needs.

Common automated irrigation methods include drip irrigation, overhead sprinklers, and soaker hoses.

Drip irrigation, for example, is highly efficient as it delivers water directly to the plant’s root zone, minimizing water wastage and reducing the risk of fungal diseases.

During the summer, when evaporation rates are high, automated systems prevent under- or overwatering, which can stress or damage plants.

Adjusting Water Supply to Plant Needs:

Greenhouse operators monitor plant water requirements closely and adjust the irrigation schedule accordingly. In addition, factors such as plant type, growth stage, temperature, humidity, and substrate type influence water needs.

Soil moisture sensors, weather data, and plant-based indicators (e.g., wilting) helps determine when and how much water to apply. By fine-tuning water supply based on plant needs, growers can optimize growth and reduce water waste.

How Does Supplemental Carbon Dioxide (CO2) Benefit Plants?

How Does Supplemental Carbon Dioxide (CO2) Benefit Plants

Exploring the role of supplemental carbon dioxide (CO2) in the greenhouse during summer

Purpose and Benefits:

Supplemental CO2 is introduced into greenhouses to enhance photosynthesis and promote plant growth, especially in closed or tightly controlled environments. Moreover, CO2 is essential for photosynthesis, and increasing its concentration can lead to improved plant yields and growth rates.

In the summer, when ventilation may be necessary to cool the greenhouse, CO2 supplementation can help compensate for the potential loss of CO2-rich air.

Use in Controlled Environments:

  • Controlled environments, such as hydroponic or aquaponic systems, use supplemental CO2 most effectively.
  • CO2 is typically released through a controlled injection system.
  • Monitoring and maintaining CO2 levels at around 1,000 to 1,500 parts per million (ppm) can optimize plant growth.
  • Careful monitoring is essential to avoid excessive CO2 levels, which can be harmful to both plants and humans.


Will a greenhouse get too hot in summer?

Greenhouses can get too hot in the summer if not properly ventilated and managed.

Do you use a greenhouse during the summer?

Yes, greenhouses are used during the summer to control the growing environment.

What is the purpose of a greenhouse in the summer?

The purpose of a greenhouse in the summer is to provide a controlled environment for plant growth, protecting them from extreme heat and other external factors.

Do greenhouses protect from extreme heat?

Greenhouses can protect plants from extreme heat by regulating temperature and providing shade.

Are greenhouses good for hot climates?

Greenhouses can be used effectively in hot climates with proper temperature and humidity management.

What is the best weather for a greenhouse?

The best weather for a greenhouse depends on the plants being grown, but generally, mild and consistent conditions are ideal for most crops.

Final Words

In conclusion, understanding how a greenhouse operates during the summer has provided me with a profound appreciation for the intricacies of creating and maintaining an ideal environment for plant growth. 

The careful balance of temperature regulation, sunlight utilization, moisture control, and pest management, along with the strategic use of supplemental CO2, exemplifies the science and artistry of modern horticulture. 

It’s clear that greenhouses are not merely structures but dynamic systems that enable growers to cultivate a wide range of crops year-round, ensuring both quality and quantity in a sustainable and efficient manner. 

As I learn more about greenhouse gardening, I’m always amazed at how technology, biology, and taking care of the environment all come together to help plants grow well and produce lots of healthy food. Greenhouses are really important for farming and studying plants!

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