How Do You Seal a Grow Room for CO2 -(Detailed!!)

Have you ever struggled with how do you seal a grow room for CO2. Well – fret not – because this issue has boggled many other grow room owners worldwide. 

So, what happens when you want to solve this issue? Well, various steps, techniques, and resources are involved in sealing a grow room for C02. 

You must also use the correct approach and methods for the best results. Fortunately, this guide identifies all you need to know about this process.

How to Seal a Grow Room for CO2 

Here is the list of resources that we recommend for sealing your grow room for c02:

Resource #1. Plastic Sheeting

Also referred to as poly sheeting, plastic sheeting is a type of material thats popular among grow room owners. 

That is because it has excellent properties for sealing a grow room for CO2. Grow rooms usually feature plastic sheeting to cover components like floors, ceilings, and walls. Aside from sealing for CO2, it also helps prevent the entry of insects, and other environmental components that can cause plant damage. 

The plastic shooting also works well for regulating the airflow, humidity and the light amounts in grow rooms. There are various plastic sheeting colors, sizes, and thicknesses – that suit different grow room settings. 

Usually, thicker plastic sheeting is common because of its longevity and ease of installation. It’s also easy to apply using products like mechanical fasteners or adhesives. It all depends on the surface, and the preference of the grow room owner. 

Plastic sheeting also helps reduce the noise amounts, and keeps pests away from the internal section of the garden. You must also use the correct type of plastic for your gardening needs. Some undergo treatment using specific chemicals that can lead to plant damage. 

Thus, you must track the label to ensure the plastics suit your grow room. Be keen on checking your plastic sheeting for various issues. 

These include rips, holes, and tears that could pave the way for plant damage. With the proper maintenance and installation, plastic sheeting is the perfect solution for sealing grow rooms. 

Recommended Product: VIVOSUN Highly Reflective Mylar Film Roll

Resource #2. Caulk Gun

A caulk gun is a handheld resource that you can use for dispensing various types of sealants using a controlled approach. Caulk guns are also common in applications involving sealing windows, seals, the carbon filter and other surfaces. 

These resources are suitable for sealing grow rooms. That is because they let you apply a consistent and even sealant layer to seal your grow room well. 

One of the best ways to use a caulK gun is to load the sealant cartridge onto the gun. Once it’s set, adjust the plunger until it gets to your preferred setting. Doing this will determine the sealant amount the gun will release. 

Once the plunger is set, apply the sealant by pressing the trigger on the caulk gun handle. 

Ensure you apply the sealant in an even and continuous line. We recommend applying gentle pressure to the gun as you move through the application process. When the sealant is ready, get a putty knife or trowel for something the sealant. 

Doing this will also help ensure the sealant sets as required. When sealing a grow room, ensure you use quality sealant products. Doing this helps to reduce issues the like the impact of moisture and other environmental elements. 

Recommended Product: Bates- Caulking Gun

Resource #3. Tape 

A CO2 sealing tape is the other resource required for sealing cracks and gaps in your grow room. Doing this helps improve the concentration of CO2 in your garden. Tape uses breathable and impermeable material that stops any gas from escaping outdoors. 

Garden tape is also available in various sizes, widths, and lengths. It’s an approach that helps ensure garden tapes suit different applications in grow rooms. 

There are multiple places you must apply garden tape. These include the floors, walls, and room ceilings. It also applies to any room section where you might notice air escaping.

 Ensure you also inspect your tape regularly to ensure no air leakage issues around the edges. Any sections where the tape has peels or cracks will require immediate repair to prevent air escape. For the best results, you must also replace the tape regularly, such as after every 3 – 6 months. 

An essential aspect of using tape involves evaluating it regularly for the presence of cracks or any damage. Ensure you repair any damaged tape components as fast as possible. Doing this helps reduce the contamination amount that occurs in your garden. 

We recommend you invest in tape that comes a in set. Sealing a grow house using tape sometimes requires lots of tape.

Recommended Product: Amazon Basics Matte-finish Tap

Resource #4. Fans

Using fans in a sealed grom is essential for various reasons. For instance, fans help regulate the CO2 levels in your garden at the desired levels. 

That is because fans are essential for good air circulation in the room, especially for the CO2 levels. In other words, it also helps ensure the gas is well distributed, and ot contained in certain areas, which can lead to uneven distribution issues. 

Plus, circulating CO2 through the room also ensures your plants are in a better position to absorb the nutrient-rich air in your grow room. 

Using fans in grow rooms also helps reduce the heat produced by lights and other resources. We recommend you try out water child lights – because they are great!

The fans help to regulate the grow room temperature, which is crucial for healthy plants. By maintaining the correct temperature levels for plant growth, you also reduce the likelihood of issues like pests and diseases occuring. 

Using fans will also positively impact the humidity amounts in your garden. Regulating humidity is important because excessive moisture encourages mold and bacteria development. 

Like all the other resources we have mentioned in this list, the size and type of fan needed depends on your grow features. These include features like the size, number of plants, and heat emmitting electrical appliances like bulbs. 

One of the best ways to check if your fan is working well is to check the temperature of green house. That is because the fan helps with temperature regulation, as well as with air quality. 

Recommended Product: VIVOSUN Ventilation Kit 6 Inch 390 CFM Inline Fan 

Resource #5. CO2 Emitting Devices

CO2 emitting devices are just that – devices that produce CO2. Most are automated, and they help regulate the CO2 amount in your grow room. It helps produce breathable air, and also works well to help plants develop. 

One of the things to consider when installing CO2-emitting devices is to pick the correct device for your space. 

You will also need a CO2 tank for ample space when using this resource. That is because it will efficiently and quickly direct CO2 air into your garden. It also ensures you can maintain a steady CO2 level over time.

However, remember, the CO2 tanks can also be costly and time-consuming to regulate. CO2 generators produce CO2 as a by-product of the burning of propane and gas. 

Once installed, ensure you also regulate its functionality and that the environment doesnt become prone to CO2 saturation. You must also check the device regularly, and adjust it over time to suit the needs of your plants. 

Keep track of any dangers that might arise from using such an electrical appliance as short-circuiting. Electrical safety is crucial in the planning stages and optimal results.

Recommended Product: ProCO2 Regular – CO2 Generator

Steps in Sealing a Grow Room for CO2

Source: Pinterest

These are the steps involved in sealing a grow room for CO2:

  1. The first step is to ensure the grow room is well sealed. We recommend checking components like the cracks, crevices, and seams for air leaks. Seal the grow room if you encounter any cracks using a foam sealant or caulk.
  2. Once you seal the room, set up a CO2 monitor to ensure the CO2 levels. Ensure you connect the monitor to a controller to activate the van or the ventilation/cooling system when the C02 surpasses normal levels.
  3. Ensure you also maintain consistent CO2 levels using a resource called a CO2 generator. The generator will release CO2 in the garden at the required times. 
  4. You must set up a fan or ventilation system to ensure the CO2 gets through the garden. Its system will regulate the CO2 presence throughout the grow for optimal plant development. 
  5. Check and monitor the CO2 levels throughout the grow and flower room.  We recommend checking the CO2 monitor regularly, and adjusting the CO2 generator as required. It helps ensure you get accurate CO2 metrics for the perfect yield.

What is CO2 and Its Importance in a Grow Room?

Source: The Columbian.

CO2 refers to carbon dioxide, an essential resource for photosynthesis in plants. It helps plants convert light energy into the sugars required for growth and development. Without sufficient CO2, plants will be prone to many issues, including poor yield. 

Usually, CO2 is naturally present in the air in concentrations that average 400 parts per million (ppm). 

However, plants develop better with higher levels. Improving the CO2 concentration levels to upto 800ppm or higher in the grow room will improve the efficiency of the photosynthesis process. Fortunately, there are devices that you can use to track the CO2 amounts in your setup. 

This will allow plants to grow and develop faster. There are various ways of adding CO2 to grow rooms (discussed below!).

How to Maintain Optimal CO2 Levels

Source: BigBudMagazine

Maintaining optimal CO2 levels in grow rooms will ensure your plants grow optimally. You can easily supplement the CO2 levels in your garden using many different techniques. 

Resources like controllers and sensors are essential for maintaining optimal CO2 levels in your grow room. 

The controller will also switch on at specific times in your garden, and based on sensor readings. On average, expect CO2 levels of 900 to 1500 ppm (parts per million) to be perfect for your plants. 

Factors in the environment, like humidity and temperature, will also impact CO2 levels in grow rooms. Increased temperatures will also lead to the excessive consumption of CO2 in your garden. 

However, high humidity can reduce the CO2 amounts your plants have available for consumption. Here are some other tips for maintaining optimal C02 levels

ProductDescriptionAmazon Link
HygrometerUse this to regulate your garden’s humidity levels.ThermoPro TP50 Digital Hygrometer Indoor Thermometer Room Thermometer
ThermometerUse this for temperature regulation.DOQAUS Digital Hygrometer Indoor Thermometer 
Air ScrubberUse this for purifying and cleaning the air.ALORAIR Air Scrubber with 3-Stage Filtration


  1. Track the CO2 levels regularly. The C02 monitor provides a convenient way of measuring C02 levels accurately. It’s also an easy-to-use resource you can set up anywhere in your grow room.
  2. Provide sufficient ventilation in the grow room. Ventilation helps ensure your plants have quality air. Resources like an air exchange fan will be necessary for this process. They help ensure air is moving, and prevent CO2 levels from getting excessive.
  3. Use CO2 generators to supplement the CO2 levels in the grow room. Ensure you adhere to your manufacturer’s instructions when sealing a grow room. Doing this helps ensure you dont face any issues when gardening. 
  4. Use carbon dioxide injection systems. These are resources that help ensure your plants receive optimal CO2 levels. They are also easy to use, and function well in the production of CO2.
  5. Maintain the temperature of your grow room. Excessive temperatures can cause an increase in CO2 levels. Ensure you maintain the temperature at the correct levels for the best results.
  6. Use CO2 scrubbers. These are resources that help you reduce CO2 levels in your garden. They are also easy to use and can be automated to make your grow room maintenance convenient. 

How Can I Add CO2 to My Grow Room?

Source: Unsplash.

There are various methods involved in sealing a grow room, including 

Tip #1. Use a Carbon Dioxide Generator

Carbon dioxide generators are reliable resources for adding CO2 to a grow room. These devices work by burning probate or natural gas to produce CO2. 

It also works to produce heat and water vapor. CO2 generators are simple to use and maintain. Plus, you can easily adjust them to meet specific C02 applications.

They are a great way to improve yield and ensure your grow room conditioners are well-controlled. Most high-end generators feature resources like over-temperature and flame failure protection for usage. 

These generators also have designs focused on providing efficient and cost-saving benefits.  Remember to set up an air conditioner to help manage the indoor environment effectively.

Tip #2. Use CO2 Bags 

CO2 bags also make up for excellent solutions for adding CO2 to a grow room. They are simple to use, even if you need to gain more technical knowledge. 

All you need is to pick the correct bags and air conditioning system for your garden. You must also fill them with drye and ice, and set in strategic positions in your grow room. 

The dry ice wil start sublimating, producing the CO2 for your grow room. The amount produced is consistent, and you can increase it by removing the bags from the grow room. 

One of the benefits of CO2 bags is they are affordable, high-quality gardening solutions. They are also sealed and keep dry ice contained in a single environment. Thus, there is minimal risk of experiencing issues like spills or safety complications. 

Since the bags contain more dry ice than liquid CO2, there is minimal risk of experiencing over pressurizing issues. You can also hang them in corners or even shelfs – wherever is suitable for your needs. 

Tip #3. Use a CO2 Controller

CO2 controllers provide an excellent approach for controlling the carbon dioxide levels required for plant growth. 

Setting up a CO2 controller in the tank makes adjusting the CO2 levels in your grow room easy. It will help improve the yield quality and amount your grow room can produce. CO2 controllers also feature a sensor that automatically measures these gas amounts in the air. 

The controller will also trigger the regulator when the CO2 levels reduce below the required amount. It will then shut off the regulator until the CO2 levels are reduced. 

Plus, you can use CO2 controllers with other climate control systems like an air conditioner and ventilation system. These controllers are also beneficial because they help you cut the cost of running and maintaining a grow house. 

How Much Does CO2 Help Yield?

Source: Unsplash.

Carbon Dioxide is an essential resource for crop production and positively impacts crop yield. It’s the gas produced as a by-product of human respiration. 

However, plants use it for photosynthesis, mostly during the day. Thus, regulating the amounts of CO2 in a grow room positively impacts the yield quality. 

Plants use this resource to change sunlight into energy through a scientific procedure called photosynthesis.

 Any increase in CO2 can have a positive impact on the yield of your crop yields. One recent study showed that an increase of 100 parts per million (ppm) of CO2 above the average level produced an 11% increase in yield.

 A Netherlands research also revealed that an almost similar amount produces an upto 19% increase in yield. CO2 also has a positive impact on water use efficiency. It means that plants will use less water to produce a similar yield. 

The reason is that higher CO2 levels trigger the closing of stomata in leaves – which also impacts water loss. CO2 can also improve the ability of crops to resist pests and diseases. Its why air conditioning systems are also crucial for sealing your grow room for CO2. We also recommend you track the CO2 levels in your greenhouse daily using a chart. 

Why is that? 

Doing this will make it easy to determine the best CO2 levels for your grow houses over time. Resources like Microsoft Excel Sheets are perfect, because they can perform the calculations, and the data is stored online in your email. 

You can also forward these metrics to professionals, or our team for more advice. While this process is not imperative – we still insist on you paying attention to detail if you want optimal yield. Remember that patience and practice is crucial for your ability to become a good grow room owner.

Why is a Sealed Grow Room Better

Source: GrowZone.

There are various reasons why a sealed room is better, including the following:

  1. Improved temperature and humidity control. A sealed grom offers improved temperature and humidity control benefits. The reason is that a sealed room is easy to manage, especially in terms of insulation and plant growth.
  2. Reduced diseases and pests. Sealing a grow ensures that insects and diseases find it hard to penetrate your grow room. You must do this, especially if you have a shared growth space. The improved and controlled environments will make your growing space better. 
  3. Improved air quality. The sealed grow room requires various resources like controllers to maintain optimal quality. You also ensure no air from the outside gets to your space. It becomes a closed looped system that makes controlling issues like hot air.
  4. Enhanced odors control. Cannabis plants often produce significant aromas, even in the smoke form. Sealing your grow room ensures these smells won’t escape to the outdoors.
  5. Reduced noise. There are various running components, like fans in the grow room, which can be noisy. Sealing your grow room helps reduce the escape of the noise, and offers improved control.
  6. Energy efficiency. Ensuring your grow room is sealed reduces the energy required for maintenance. 

Frequently Asked Questions (FAQs)

What Do You Use to Seal a Grow Room?

There are various resources that you can use to create a sealed grow room. These include pest blockers, door seals, Windsor stickers, and silicone. For temperature control, consider setting up resources like air conditioners and heaters. 

Can You Seal a Grow Room?

Yes, it’s possible to seal a grown, and it’s important for the yield and crop quality your garden will produce. You will also need resources like an air conditioner, CO2 generators, and regulators for the best results. You also need a door seal.

Do You Need to Exchange Air in a Sealed Grow Room?

No, you dont need to exchange the air in a sealed grow room. That is because the concept of a sealed grow room involves no holes or air exchanges without THE doors. However, it doesnt have to be airtight but sealed enough to maintain the CO2 levels.

How Can I Add CO2 to My Grow Room?

There are various ways of adding CO2 to your grow room. You can use CO2 emitters or bags, which are best for convenience. You will also need a CO2 regulator for the best plant yield results.

Is a Sealed Grow Room Better?

Yes, a sealed grow room is better. That is because it makes it easy for you to regulate the living conditions of the plants. It also makes it easy to track issues like disease or plants with health issues. Indoor growers should always for sealed environment to regulate issues like room temperatures.

What Is the Cheapest Way to Add CO2 to a Grow Tent?

The cheapest way to add CO2 to a grow tent involves hanging carbon dioxide bags. It is an effective and cost-effective method for adding CO2 to any garden. It is also convenient because you just hang it on the wall, and thats it.

How Do You Ventilate a Grow Room Without Windows?

There are various ways of ventilating a grow room without windows. It involves using a resource like an extractor fan or exhaust fan. You install them to help remove hot and humid air away from the garden. You usually set them on the ducting system.

Can You Have Too Much Airflow in a Grow Room?

Yes, its possible to have excessive air flow in a grow room. Such issues can lead to leaf tearing, breakage, and increased presence of impurities in the air. Ensure you use any resources posible for air regulation purposes. 

How Do You Soundproof a Grow Room?

While too much air movement can cause steam breakage, leaf tearing, and growth in different directions, Quest recommends always having a steady air flow in your growth up to that threshold.

Does CO2 Work With Led Grow Lights?

High-powered grow lights like HPS, and large LEDs usually guarantee a sufficient supply of PPFD. It helps make additional CO2 a reasonable solution, especially if CO2 levels also go low. Some light might go to waste because the plants won’t digest it due to the lack of CO2.

Whaat Is the Ideal Grow Room Temp With CO2?

The best grow room temperature for managing CO2 should be three to four times the atmospheric amount. It should average at 1500 ppms CO2 at 86°F is optimum. You can use resources like controllers to help you maintain this level. 

While sealing a grow room for CO2 is possible, realize that you have your work cut out for this one. Looking on the brighter side – this process is simple when you have a conclusive guide. Contact us if you have any more information about this process – we’d love to hear from you!

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