10 Best Co2 Generator For Greenhouse of 2026

Tested and Reviewed: Top 10 Co2 Generator For Greenhouse deals with expert ratings from 8.1 to a perfect 10

July 2026 Edition

Editor's Choice

9.7

Exhale

ExHale CO2 Original Grow Bag - Patented Mycelium Strain for Indoor Grow Rooms, & Carbon Dioxide Enrichment - CO2 for Grow Tents - Boosts CO2 Production for 6 Months - 4 lbs. (1 Pack)

Editor's bottom line:

“This co2 generator for greenhouse is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

PASSIVE CO2 PRODUCTION - The Original ExHale CO2 Bag will provide a 4x4 foot or 128 cubic foot space with CO2 for up to 9 months, of which 6 months are peak production. This product is ideal for smaller grow rooms and grow tents that are looking to produce more CO2 and catalyze plant and vegetative growth.
EXPERIENCE A LARGER YIELD - Grow rooms, when used in companionship with the Original ExHale CO2 bag, can experience anywhere from 20% - 30% more growth. Requires no heat, electricity or complicated gear. Curated for indoor growers, hobby gardeners and greenhouse enthusiasts.
MAINTENANCE FREE - Place the ExHale bag slightly above the height of the plants in your grow space. CO2, being heavier than O2, will precipitate downward towards your plants. ExHale Original CO2 is a revolution in indoor CO2 production systems. Maintenance Free! Just CO2! Proudly made in the USA. Use it as a natural alternative to electric CO2 generators and equipment.
PERFECT FOR MOST PLANTS - ExHale can be used for both vegetative plant growth as well as for fruit and flower production. Put the ExHale CO2 Bag in your grow tent, and let it do its thing. Works best with controlled airflow and ventilation; optimal results in sealed or semi-sealed environments. A must-have for serious growers.
EASY-TO-FOLLOW DIRECTIONS - Remove hanger from bag. Fold the top of the bag over and re-attach the separation seam hanger by placing it above the filter patch. The Exhale bag can now be placed in your garden. Avoid compressing or folding the bag when hanging.

Show Price

Picked by 397 people today

9.5

Generic

Autopilot CO2 4 Burner, LP

Main Highlights

Autopilot CO2 4 Burner, LP Propane

Show Price

9.5

CO2BAG

CO2BAG® M - Natural CO2 Generator for Grow Tents, Indoor Plants & Greenhouses | Boosts Growth, Yield & Harvest Speed | Organic Hydroponic Supplement | Compact & Maintenance-Free (Medium 1-Pack)

Main Highlights

ACCELERATE GROWTH & YIELD: Boost photosynthesis naturally. Our consistent CO2 supply leads to significantly faster plant growth, quicker fruit ripening, and up to 20% bigger, healthier harvests.
EFFORTLESS & MAINTENANCE-FREE: No expensive tanks, regulators, or electricity needed. Simply hang the bag in your grow space above plant height and let the natural process work 24/7 for up to 3 months.
PERFECT FOR GROW TENTS & SMALL SPACES: One Medium CO2Bag is optimized for areas up to 2m² (21 sq. ft). Its the ideal budget-friendly solution for hobby growers and compact indoor gardens.
SAFE, ORGANIC & EASY TO USE: 100% safe for plants and people. Our organic formula releases CO2 steadily without heat, creating the perfect atmosphere for your green room.
THE GROWERS CHOICE: Join thousands of satisfied indoor gardeners. We stand behind our Finnish innovationif youre not seeing the results, well make it right. Shop with confidence!

Show Price

9.2

Autopilot

Autopilot APGN0400 CO2, 4 Burner, NG Generator, White

Main Highlights

All models are equipped with:
Precision manufactured brass burners
Solid-state electronic ignition module pilot light necessary
Tip over switch shuts off gas source if the unit falls or tips over
Shut down warning with LED error indicator lights

Show Price

9.0

CO2BAG

CO2BAG® M 2-Pack - Natural CO2 Generator for Grow Tents & Greenhouses | Value Bundle for Double Coverage | Boosts Plant Growth, Yield & Harvest Speed | Organic Hydroponic Supplement | Maintenance-Free

Main Highlights

BEST VALUE BUNDLE: Get more for less! Our 2-Pack provides a cost-effective solution for serious growers, ensuring your plants have a consistent supply of CO2 for maximum photosynthesis and up to 20% bigger yields.
DOUBLE THE COVERAGE: Optimized for larger grow spaces. Two Medium bags are perfect for areas up to 4m² (42 sq. ft). Use them simultaneously for large rooms or sequentially to provide 6 months of continuous growth boost.
ACCELERATE GROWTH & HARVEST: Don't let CO2 be the bottleneck of your garden. By increasing the carbon dioxide levels, your plants grow thicker stems, develop faster, and ripen their fruit significantly earlier.
100% ORGANIC & MAINTENANCE-FREE: No expensive CO2 tanks or complicated regulators required. Simply hang the bags slightly above plant height and let the natural, heat-free process work its magic 24/7.
FINNISH QUALITY & SAFETY: Trusted by thousands of hydroponic and indoor gardeners worldwide. Our organic formula is safe for your home, your family, and your plants. Shop with confidenceyour satisfaction is our priority!

Show Price

8.8

CO2BAG

CO2BAG® XL 2-Pack - High-Capacity Natural CO2 Generator for Large Indoor Gardens & Enthusiast Greenhouses | Maximum Growth & Yield | Organic Hydroponic Supplement | Maintenance-Free (XL 2-Pack)

Main Highlights

THE ENTHUSIAST'S CHOICE: Designed for serious indoor gardeners who demand the best results. The XL 2-Pack provides a massive, consistent CO2 boost, ensuring your plants reach their full genetic potential for explosive growth and heavy harvests.
MASSIVE COVERAGE FOR LARGE ROOMS: Optimized for large-scale hobby setups. Each XL bag covers up to 10m² (107 sq. ft). With this 2-Pack, you can saturate a massive 20m² area or use them sequentially for up to 3 months of continuous, high-output CO2 enrichment.
SUPERCHARGE PHOTOSYNTHESIS: Don't let stagnant air limit your harvest. The XL bags release a powerful stream of natural CO2, allowing your plants to thrive even in high-intensity lighting environments, resulting in thicker stems and significantly denser fruit.
NO TANKS, NO HASSLE: Get professional-level atmospheric enrichment without the need for expensive CO2 tanks, regulators, or electricity. Simply hang the bags slightly above plant height and let the natural, organic process work 24/7.
PREMIUM FINNISH QUALITY: Trusted by the most dedicated growers worldwide. 100% organic, safe for home use, and maintenance-free. Experience the original Finnish innovation that has revolutionized indoor gardening for over a decade.

Show Price

8.6

Nextera

CO2 Bags for Grow Tent Greenhouse Accessories CO2 Generator for Plants Growth Tent and Supplies Indoor Growing Rooms 3.5 oz (100g)

Main Highlights

Simple CO2 Release Grow Bag: Designed with simplicity and stability in mind, this product is commonly referred to as a CO2 generator bag and functions as a passive CO2 release bag for indoor gardening. It features a light-blocking outer layer to help reduce external interference.The CO2 release structure allows a gradual release process, helping support a balanced growing environment over time. Pre-set holes allow flexible setup based on different needs. Simply open and hang for easy use with other greenhouse accessories.
Passive CO2 for Grow Tent Indoor: This product is commonly referred to in the market as a co2 generator for plants and functions as a passive CO2 bag for indoor gardening. It is suitable for use in co2 bags for grow tent setups and other semi-enclosed environments. This electricity-free solution helps support a more balanced growing environment when used with proper lighting and nutrients, providing a passive source of CO2 for plant care.
Top Down CO2 Plant System: This CO2 release bag can be used as part of a co2 plant system setup for indoor growing environments. It is recommended to place it above plant level. CO2 is heavier than air and will naturally move downward, which may help support distribution around plants in greenhouse accessories setups and indoor cultivation spaces. The top opening design allows a gradual release of CO2 suitable for different indoor gardening conditions.
Long-Lasting CO2 Bag Design: These co2 bags for grow tent are designed with a slow-release structure and typically last around 13 months depending on environmental conditions. This product is commonly referred to in the market as a co2 generator and functions as a passive CO2 bag for co2 for plants in indoor gardening environments. It is suitable for use as co2 bags for grow room setups and other greenhouse supplies. Duration may vary with humidity, airflow, and temperature.
Indoor Grow Tent Compatibility: Suitable for grow tents ranging from 2x2 to 8x8, as well as other indoor plant environments, these products are designed as grow tent accessories for flexible indoor use. They can be used as co2 bags for plants in a variety of growing setups. The pre-set hole design allows adaptable use across different indoor conditions, including varying humidity and airflow levels.

Show Price

8.3

CO2BAG

CO2BAG® XL - High-Capacity Natural CO2 Generator for Large Grow Rooms & Greenhouses | Maximum Growth & Pro-Grade Yields | Extra Large Organic Hydroponic Supplement | Maintenance-Free (XL 1-Pack)

Main Highlights

MAXIMUM GROWTH FOR LARGE SPACES: Our highest-output bag. The XL is specifically engineered for professional-grade indoor gardens and large greenhouses, providing the massive CO2 boost needed for explosive growth and record-breaking harvests.
EXTENDED COVERAGE: One XL CO2Bag is optimized for areas up to 10m² (107 sq. ft). Its the perfect high-capacity solution for larger grow tents and large basement setups where smaller bags just won't cut it.
SET IT AND FORGET IT: No expensive tank refills or dangerous gas regulators. Simply hang the XL bag slightly above plant height. It starts working immediately and provides a steady, natural CO2 stream 24/7 for up to 3 months.
ELIMINATE GROWTH BOTTLENECKS: In high-performance gardens, lack of CO2 is the #1 limit to yield. The XL bag ensures your plants have all the "fuel" they need for photosynthesis, resulting in thicker stalks and significantly heavier fruit.
TRUSTED FINNISH INNOVATION: 100% organic, safe, and maintenance-free. Join professional growers worldwide who rely on the original CO2Bag for clean, effective, and sustainable indoor farming.

Show Price

8.1

The Green Pad

The Green Pad GP6050 CO2 Generator Contains 5 Pads w/2 Hangers

Main Highlights

The GREEN PAD CO2 generators has made adding Carbon Dioxide to indoor gardens easier than ever
THE GREEN PAD may be one of the most inexpensive and innovative ways to get the good gas to your plants. THE GREEN PAD's were designed to produce enough CO to be of significant benefit to the indoor home garden without the up front expense of equipment, but with similar results.
The Green Pad is the real deal. Digital meters show high levels of CO FOR ALL YOUR CURRENT TANK CUSTOMERS THAT USE TANKS. Do not get in a situation where you run out of CO. THE GREEN PAD is your backup for growers using CO tanks that run empty. Keep an extra pack on hand for emergencies or when you cannot get a tank refill.
Without expirations issues, THE GREEN PAD's are ready when your garden needs them. EASY TO USE: To raise your PPM's follow the directions and hang 1-2 GREEN PADS above your canopy per every 200-400 cubic feet of garden space. Activated by humidity (35%) and /or by lightly misting with water or, adding a moist sponge to a folded GREEN PAD.
Adding more of THE GREEN PADS will increase your PPM's in your specific area

Show Price

Our Best Overall Choice

Best Choice

9.7

Exhale

ExHale CO2 Original Grow Bag - Patented Mycelium Strain for Indoor Grow Rooms, & Carbon Dioxide Enrichment - CO2 for Grow Tents - Boosts CO2 Production for 6 Months - 4 lbs. (1 Pack)

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

PASSIVE CO2 PRODUCTION - The Original ExHale CO2 Bag will provide a 4x4 foot or 128 cubic foot space with CO2 for up to 9 months, of which 6 months are peak production. This product is ideal for smaller grow rooms and grow tents that are looking to produce more CO2 and catalyze plant and vegetative growth.
EXPERIENCE A LARGER YIELD - Grow rooms, when used in companionship with the Original ExHale CO2 bag, can experience anywhere from 20% - 30% more growth. Requires no heat, electricity or complicated gear. Curated for indoor growers, hobby gardeners and greenhouse enthusiasts.
MAINTENANCE FREE - Place the ExHale bag slightly above the height of the plants in your grow space. CO2, being heavier than O2, will precipitate downward towards your plants. ExHale Original CO2 is a revolution in indoor CO2 production systems. Maintenance Free! Just CO2! Proudly made in the USA. Use it as a natural alternative to electric CO2 generators and equipment.
PERFECT FOR MOST PLANTS - ExHale can be used for both vegetative plant growth as well as for fruit and flower production. Put the ExHale CO2 Bag in your grow tent, and let it do its thing. Works best with controlled airflow and ventilation; optimal results in sealed or semi-sealed environments. A must-have for serious growers.
EASY-TO-FOLLOW DIRECTIONS - Remove hanger from bag. Fold the top of the bag over and re-attach the separation seam hanger by placing it above the filter patch. The Exhale bag can now be placed in your garden. Avoid compressing or folding the bag when hanging.

Show Price

Deals are Live

Special Amazon deal ends in: