Building a Sealed Grow Room: The “ULTIMATE” Guide!

Building a sealed grow room might seem simple but it requires various resources and techniques. Fortunately, it’s possible with the correct information! Building a sealed grow room helps ensure your plants have a sufficient temperature, and the smells from aspects like buds stay indoor garden space.

Doing it the first time can be challenging, especially without an evidence-based guide.  It’s why we have prepared this guide to help make it easy for you to build one for your needs.

Are you ready to get started?

How to Build a Sealed Grow Room – Assembly

how to build a grow room in a garage

We identified all the techniques and supplies you need to build a sealed grow room, including:

Items Required

ItemDescriptionAmazon Link
FansUse this for air circulation.VIVOSUN D4 4 Inch 195 CFM Inline Duct Ventilation Fan
Air filtersUse this for air quality maintenance.LEVOIT Air Purifiers for Home Large Room, H13 True HEPA
Grow lightUse this for lighting up the grow room.MARS HYDRO TS-1000 Led Grow Light
SealUse this to seal any spaces like on the doors.Yowlieu 12′ x 25′ Clear Greenhouse Plastic Sheeting,
pH meterTo regulate the soil pH.APERA INSTRUMENTS AI209 Value Series PH20
CO2/Humidity regulatorFor air regulation.Inkbird Humidity Controller IHC200
Carbon filterTo regulate the cannabis smell.VIVOSUN 4 Inch Air Carbon Filter
Grow tent.For setting up the grow room.AC Infinity CLOUDLAB 733 Advance Grow Tent
Light timer.For regulating the light functions.Fosmon Indoor 24-Hour Mechanical Outlet Timer
Air conditioner.For air quality maintenance.HUMSURE Dehumidifier 30 Pint 1,500 Sq

Steps Involved 

  1. Pick a location. Choose an area on your property free from human traffic, pets, or other obstacles. Doing this helps ensure your grow room causes the least compromise to your living conditions
  2. Prepare the space. Check the space for pests, contamination dirt, and damage issues. 
  3. Set up the insulation. Set up the insulation in your grow room, because it helps with heart and humidity control. 
  4. Add the fans. We recommend you also add fans to help improve the quality of air circulation in the grow room.
  5. Install air filters. These are important for eliminating impurities from the air, and keeping your grow room clean.
  6. Seal the room. Get a sealant, and use it to ensure no air will move out from your garden.
  7. Install grow lights. Add grow lights to your sealed rooms to provide the ideal environment for your plants. 
  8. Add water and nutrients. The final step is to add the required water and nutrient amounts for your plants. 

Building a Sealed Grow Room – The Resources

sealed grow room temperature

Here is the detailed version of building a grow room:

  1. Grow Lights. Plants need a reliable light source, and choosing the right type is crucial for your yield. The size of light you wil pick depends on the size of your grow room. We have noticed the best grow lights for grow rooms are LED Lights. Why is that? It’s because LED lights provide a full light spectrum. 
  2. Carbon filter. Install this to help remove odors, and harmful contaminants in the air. The best carbon filter for grow rooms is the type made using activated carbon. 
  3. Fan and ducting. These are important for circulating and directing air in the grow room. Ensure you pick a fan and ducting that’s relevant to the size of your sealed rooms.
  4. Light timer. Use this to build your sealed rooms. It helps ensure you regulate the amount of light your plant receives and can also be automated. 
  5. Grow tent. This is a sealed and reflective setup that you can use for your gardening needs. It’s usually made using waterproof, reflective, and lightproof materials. Some also come equipped with resources like fans and lights. 
  6. Air conditioner and dehumidifier. An air conditioning system helps maintain the right temperature for your plants. The dehumidifier helps regulate the humidity levels, which are crucial for plant yield and development.
  7. Air circulation fans. There are various fans you can set up in your sealed grow room. The best type depends on your preferences. They include inline ducts, wall mounts, ceiling, oscillating, and airflow fans.  
  8. Heat mats or cable. These help provide a uniform and even heat for your grow room. Heat cables are ideal for localized heating in specific gardening areas. Both help prevent issues like the accumulation of condensation or mold. 
  9. Thermometer and humidity gauge. We recommend you go for a digital and reliable resource for accurate readings. Ensure you also get a thermostat for controlling temperatures. A hydrometer can also help you measure humidity. 
  10. Hydroponic system. These specialized growing systems feature nutrient-rich water for plant growth and sustainment. It usually features a sealed grow room, water pump, and hydroponic system components like grow lights. These systems offer efficient and effective resources for growing plants in controlled settings.
  11. Plant nutrients. These are important for growing plants in seal settings and delivering high-quality nutrients. The primary nutrients your plant will receive include Potassium (K), Nitrogen (N), and Phosphorus (P). Other micronutrients that plants require include iron, zinc, calcium, and magnesium.
  12. pH meter. It refers to a device you use to measure a solution’s alkalinity or acidity levels. You use these resources in indoor and hydroponic gardening systems for measuring pH levels. pH meters also ensure the nutrition solutions are well-balanced and suited for plants.
  13. Water pump. A water pump is an essential resource for the regulation of water quality. You use it to circulate water and nutrients in your garden. It’s part of the essential resources you need to regulate the garden’s moisture and nutrient levels. Water pumps also help ensure your grow room has sufficient circulation.
  14. Water tank. A water tank is a large and sealed container that you can use to store various resources. They are suitable for supplying a reliable source of water for grow rooms. Try and keep your water tanks sealed to stop issues like evaporation. It may also require a filtration system.
  15. Grow medium. This refers to specialized material you use to make a sealed environment for growing plants. Usually, most growers set it up alongside resources like hydroponic systems. Grow mediums can include various resources like rockwool, perlite, coir, and expanded shale. The role of growth mediums is to provide the right environment for plant development.
  16. Plant containers. These are containers you use to create sealed grow rooms. Some resources you can include here include pots, planters, buckets, and trays. Plus,  we recommend you go for the types made using plant-safe materials. Ensure they are also large enough to accommodate the plant size, and have sufficient drainage holes.  
  17. Air pumps. An air pump is crucial for building a seal grow room. It allows you to maintain the correct carbon dioxide and oxygen levels. It is also important for hot air circulation and room temperature regulation. 
  18. Measuring cups. These measure different resources like water, grow mediums, and fertilizers. The best measuring cups are made using glass, steel, and plastic. Also, go for measuring cups that are simple to read, and have clear measuring metrics.
  19. pH adjusters. You use these resources to regulate the pH levels of grow mediums and the soil. Some common types include sodium bisulfate, potassium hydroxide, buffer solutions, and reverse osmosis systems. Indoor cultivators opt for these products because of their affordability and convenience.
  20. Pruning tools. These tools are essential for cutting down unwanted parts of your plants. Examples include electric pruning shears, scissors, loppers, and saws. 
  21. Grow room sealant. It refers to a product you use to seal your grow room, a silicone-based product. It also provides longevity, and resistance to UV light and moisture. 
  22. Reflective material. These materials you use for indoor gardening and to help improve the number of light plants can use. You use them by lining them on ceilings, walls, windows, and floors. The best reflective material for grow houses includes white paint, mylar, and aluminum foil. 

Was this list long? We know it was! But you know what? The key to any venture, especially in gardening, is maintaining optimal attention to detail. 

The resource we have mentioned above are not set in stone. Instead, use it as a guide to help you build the best sealed grow room that you can build for indoor gardening. 

Use them as a source of inspiration for your indoor gardening needs – because it requires effort. Looking at things from the bright side – expect the best buds within 2 – 4 months of setting up your grow house. 


sealed grow room problems

The preparation step in building a grow room requires attention to detail. You will start by measuring the area you want to set up the grow room. 

That is because you must determine the space required to set your plants, and all the resources. 

Collect all needed materials, including the seals, drywall, and fans. Insulation will also require materials that can block light out from your garden. Proper preparation ensures you can create the perfect controlled environment for your plants. 

Building a sealed grow room setup requires careful planning and attention to detail. Start by measuring the area where you plan to build the grow room. You’ll need to know the exact size of the cultivation space to determine what materials and equipment you’ll need. 

Gather the necessary materials for the project, including insulation, drywall, plastic sheeting, and a strong airtight sealant. 

When it comes to insulation, use a material that will block out light and keep the room temperature balance consistent. Once you have all of the materials in place, begin constructing the walls of the grow room. 

Environmental factors are also crucial in the preparation stage. These include air exchange, light levels, temperature, and humidity. 

Ensure you also consider the plant types you will set in the grow room. The best temperature for indoor plants averages between 20 to 25 degrees Celsius. Plants that are exposed to excessive heat won’t grow as required. 

Sealing and Insulation

sealed grow room air scrubber

Sealing and insulation is the other vital factor to consider in setting up your grow room. We recommend you start this process by sealing the grow room using the right resources. 

This includes high-quality plastic sheeting, which will help produce a barrier that seals out vapor. 

Ensure you apply to sections of the grow room like walls and ceiling. The door, and window openings will also require sealing to stop air leak issues. 

Ensure you place the plastic on the edges of the walls, the doors, and the Windsor frames. We recommend you settle for professionally mounted doors. You will also get a silicone sealant to cover any sections that are difficult to access. Silicone sealant is also easy to use on resources like pipes or other openings in your walls. 

Once you set the sealant and plastic sheeting. Set up weather stripping on the doors. Weather stripping is usually a foam strip applied to your doors and windows. The other factors to consider when sealing and insulating a grow room are:

  1. Check for light and air leaks. Ensure all doors, window frames, roofs, and water chilled lights are free from any apertures. Seal the light and air leaks using products like caulk and weatherproofing when possible. 
  2. Insulate ceilings and walls. You must set up insulation on the walls and ceiling to help maintain humidity and temperature. Ensure you also use the insulation thats suited for the size and nature of your grow room
  3. Set up vents. Vents are essential for the circulation of fresh air. It directs air from the outdoors and directs exhaust air to escape. A fan helps with air circulation levels in vents. 
  4. Check the grow lights. Remember to check your grow lights, especially the bulbs, and the light intensity. Plus, the lights will also require sealing around the edges to stop issues like light and air leaks.
  5. Set up a dehumidifier. A dehumidifier helps maintain the quality of air in your grow room. Ensure it’s well sealed on the edges as well. 
  6. Seal the doors. The doors might be entry points to your garden, but they also require sealing. Many indoor cultivators often have measures to ensure these challenges don’t occur.

Climate Control

hybrid sealed grow room

Owning a successful grow requires the right climate control measures. Part of this process involves maintaining temperature, humidity, and airflow. Here are a few details of the species involved in all procedures and their relevance to climate control:

  • Temperature. The best temperature for a grow averages between 65 and 85 degrees Fahrenheit. Using excessively low temperatures can stunt plant development or lead to issues like wilting. We recommend you use a mini split ac system for room cooling purposes.
  • Humidity. The ideal humidity for sealed grow rooms averages between 39 to 59%. Excessive humidity can lead to disease, mildew, and mold issues. We recommend a dehumidifier to help you regulate this process. 
  • Airflow. Airflow is crucial for the quality and environment of grow house. Resources like fans help to produce a gentle breeze that movies air in your garden. It also helps prevent the accumulation of pests and diseases. Maintaining the correct airflow will have positive results for your garden. 
  • Lighting. Lighting is crucial for your plant’s ability to photosynthesize and produce energy. Different lights are suitable for growroom, and each helps with climate control applications. 
  • Ventilation. Ventilation is also essential for ensuring plants receive optimal carbon dioxide and oxygen for survival. A resource like intake fans can be helpful for the regulation and supply of air to your grow room. Plus, you also need to clean these fans regularly for a clean garden.
  • Filtration. It’s also essential that you remove the air in your grow room. Ensure it is free from pollen, dust, and other airborne particles that can cause plant harm. Consider getting a resource like an air filter for air purification, and to improve the living conditions of your plants. 


sealed grow room without co2

You should consider various factors when setting up the lighting in your grow room. You must consider the lighting needs and the amount your plants will require. 

Factors like the grow room size will be necessary for this process. Usually, a sealed grow room works best with LED or High-Intensity Discharge (HID) lights. 

These lights are highly energy efficient and will produce less heat when compared to the HID alternatives. Thus, these lights are perfect for when you have a sealed grow room. 

You will also usually find various light sizes, wattages, and brands. So customizing the lights to suit your grow house will require some time and research on your end. 

The best placement of grow lights should be in a grid pattern. Why is that? It’s because this provides optimal coverage using an evenly spaced grid pattern. Other factors you should consider regarding lighting include

  • Lighting size. Consider the number of plants you want to grow when picking the light size. Other factors like the size of grow space, and your light intensity is also crucial. Usually, 25 watts of light per square foot is best for plant development. A good example is when you are growing plants in a 4 x 4 setup – we recommend you set up a 400-watt light for this space.
  • Spectrum. Optimal cannabis growth also requires light that produces a full light spectrum. Therefore, ensure you use a unique combination of blue, green, and red lights. The ratio of these colors often varies based on your plant’s growth stage. Plants thrive when you maintain the right light spectrum levels.

Frequently Asked Questions (FAQ)

How Do You Set up Sealed Indoor Grow Rooms?

There are various ways of setting up sealed indoor grow rooms. Resources like pest blockers, doorseal, and window stickers are all critical for this process. Get an air conditioner or heater for the best results for temperature control.

How Does a Sealed Grow Room Work?

A sealed growrooms works like a closed-loop system. There is no air extract out to or draw in from the outside in the seal growroom. Instead, the temperature is maintained using a heater, and the air quality using an air conditioning system.

Does Grow Room Have to Be Sealed?

A grow room must be sealed for the best plant growth and development conditions. You must regularize the growth patterns of your plants, and provide them with access to the proper nutrition regimen.

How Often Should You Change the Air in a Sealed Grow Room?

A simple technique is the best way to change the air in a sealed grow room. You need resources like an air conditioner, air filter, and venting system. You must also ensure these resources function optimally, especially the vents that expel air outdoors.

Can a Plant Survive in a Sealed Container?

No, a plant can’t survive in a sealed container. That is because they require a fresh air supply for processes like photosynthesis. It’s best to ensure you set your plants in a spacious environment instead of a container for optimal growth.

What Material Is Used for Grow Room Walls?

FRP has been the most popular material for growroom walls, and heating functions. The other material is plastic, which is affordable and simple to set up in different sections of the garden.. You must also track the application process for the best results.

Do You Need AC in a Grow Room?

Yes, you need an AC in the growroom, because it helps with air circulation and regulation applications. A hot or heated grow room is not good because it can compromise the yield your plants will produce.

How Do I Make My Grow Room Smell Proof?

There are various ways of making your grow room smell-proof. You need resources like carbon filters and inline filters for the best results. These two components are essential for setting up grow house ventilation systems.

How Do You Ventilate a Grow Room Without Windows?

Using intake fans is the best way to ventilate a grow room without windows. These systems draw fresh air from the outside, and direct them into the grow room. Oscillating fans, exhaust fans, and inline fans can all be helpful for this process.

What Should I Put On My Grow Room Floor?

The best resource to place on your grow room floor is resin-coated concrete. Resinous floor solutions like urethane and epoxy can also be helpful for this process. You must also check the floor for any signs of damage.

There you have it – you can build a sealed grow room. But, remember the importance of paying attention to detail. Use this guide to help you identify the best possible angle for achieving your goal. You can also contact us if you have any questions or comments about this process!