10 Best Co2 Generator For Greenhouse of 2025

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

February 2026 Edition

Editor's Choice

9.7

CO2BAG

CO2BAG® M – Natural CO₂ Generator for Indoor Plants & Greenhouses | Boosts Growth, Yield, Taste & Color | Compact, Safe & Maintenance-Free

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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

Accelerated Plant Growth & Higher Yields: Consistent CO supply helps plants photosynthesize more efficiently, leading to faster growth, quicker fruit ripening, and bigger, healthier harvests.
Effortless & Maintenance-Free: No tanks, regulators, or electricity required. Just hang the bag in your grow space and enjoy natural CO enrichment for weeks.
Safe for Plants & People: Releases CO steadily and safely, creating the ideal growing environment for indoor grow rooms and greenhouses without risk.
Compact Yet Powerful: Effective for areas up to 2m² (for size M), making it the perfect solution for hobby growers, small tents, or compact greenhouses. Its a budget-friendly alternative to expensive CO systems.
Satisfaction Guaranteed: We stand behind the effectiveness of every CO2BAG. If youre not fully satisfied with the results, well make it right grow with confidence.

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Picked by 397 people today

9.5

CO2BAG

CO2BAG® XL – Natural CO₂ Generator for Indoor Plants & Greenhouses | Boosts Growth, Yield, Taste & Color | Compact, Safe & Maintenance-Free

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Main Highlights

Accelerated Plant Growth & Higher Yields: Consistent CO supply helps plants photosynthesize more efficiently, leading to faster growth, quicker fruit ripening, and bigger, healthier harvests.
Effortless & Maintenance-Free: No tanks, regulators, or electricity required. Just hang the bag in your grow space and enjoy natural CO enrichment for weeks.
Safe for Plants & People: Releases CO steadily and safely, creating the ideal growing environment for indoor grow rooms and greenhouses without risk.
Compact Yet Powerful: Effective for areas up to 3m² (for size XL), making it the perfect solution for hobby growers, small tents, or compact greenhouses. Its a budget-friendly alternative to expensive CO systems.
Satisfaction Guaranteed: We stand behind the effectiveness of every CO2BAG. If youre not fully satisfied with the results, well make it right grow with confidence.

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9.5

CO2BAG

CO2BAG® XL – Natural CO₂ Generator for Indoor Plants & Greenhouses | Boosts Growth, Yield, Taste & Color | Compact, Safe & Maintenance-Free -2-Pack-

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Main Highlights

Accelerated Plant Growth & Higher Yields: Consistent CO supply helps plants photosynthesize more efficiently, leading to faster growth, quicker fruit ripening, and bigger, healthier harvests.
Effortless & Maintenance-Free: No tanks, regulators, or electricity required. Just hang the bag in your grow space and enjoy natural CO enrichment for weeks.
Safe for Plants & People: Releases CO steadily and safely, creating the ideal growing environment for indoor grow rooms and greenhouses without risk.
Compact Yet Powerful: Effective for areas up to 3m² (for size XL), making it the perfect solution for hobby growers, small tents, or compact greenhouses. Its a budget-friendly alternative to expensive CO systems.
Satisfaction Guaranteed: We stand behind the effectiveness of every CO2BAG. If youre not fully satisfied with the results, well make it right grow with confidence.

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9.2

CO2BAG

CO2BAG® M for Effective Growth | Improves Taste, Color & Yield | Compact & Maintenance-Free for Indoor Growing and Greenhouses. -2-Pack-

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Main Highlights

CO2bag is very small and easily affordable bag producing carbon dioxide for your plants.
Increases the growth rate of your plants, accelerates the ripening of the fruit
CO2bag is safe to use, easy to setup without any maintenance required.
100% satisfaction quarantee of all our products!
Recommended room size for one CO2BAG M is up to 22 ft2
We are happy to answer your questions. Support: support@co2add.com
CO2 is heavier than air, so you must put the bag HIGHER than plants.

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9.0

Autopilot

Autopilot APGN0400 CO2, 4 Burner, NG Generator, White

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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

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8.8

VIVOSUN

VIVOSUN Hydroponics CO2 Regulator Emitter System with Solenoid Valve Flowmeter for Grow Room Grow Tent Garden

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Main Highlights

Durable Material: Long-lasting durable brass components will function for many years without rusting
Specifications: 1.58" high pressure gauge: 0-4000 PSI; Flowmeter: 0-15 SCFH; Inlet connection: cga-320
Application: Perfect for enhancing the amount of available carbon dioxide and accelerating plant growth rates and yields by up to 40% in indoor hydroponics, grow rooms, grow tents and warm houses
Components: A precision regulator, flow gauge, and industrial solenoid valve, 5 meters free plastic dispensing tubing and USA standard 3-prong plug (hose tail to suit 4.2 mm hose diameter)
Multiple Options: This CO2 regulator will allow you to maintain ideal CO2 levels for optimal growth

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8.6

The Green Pad

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

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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

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8.3

Exhale

ExHale CO2 Original Bag - Great for Indoor Grow Rooms & Carbon Dioxide Enrichment - CO2 for Grow Tents - 4 lbs. (1 Pack)

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Main Highlights

GREAT FOR GROW ROOMS - The Original ExHale CO2 Bag will provide a 4x4 foot or 128 cubic foot space with CO2 for 9 months, of which 6 months are peak production. This product is great for smaller grow rooms and grow tents that are looking to produce more CO2 and catalyze 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 or electricity.
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-Homegrown CO2 is a revolution in indoor CO2 production systems. Maintenance Free! Just CO2! Proudly made in the USA.
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.
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.

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8.1

The Green Pad

The Green Pad Junior GP6010 Carbon Dioxide CO2 Generator Greenhouse Garden Pad with Humidity Activation for Clone Propagating, 10 Pads

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Main Highlights

GREAT FOR SEEDLINGS AND CLONES: Commercial carbon dioxide supplement made specifically for seedlings and clones
GREAT FOR SEEDLINGS AND CLONES: Commercial carbon dioxide supplement made specifically for seedlings and clones
HUMIDITY ACTIVATED: Absorbs the humidity in your propagation dome powering natural chemical reaction and releasing a measured amount of carbon dioxide
PRODUCES HEALTHY PLANTS: Provides higher strike rates, less leaf yellowing, and faster rooting by 2 to 3 days or more
EASY TO USE: Simply place in your humidity dome and replace every other day until fully rooted or when you remove the dome

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8.1

Hygger CO2

2L Aquarium CO2 Generator System, CO2 System Kit with Regulator and Needle Valve for Aquarium Plants Tanks

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Main Highlights

Professional Factory -- Our 2L CO2 bottles are constructed from premium 1.2mm SUS304 stainless steel - 20% thicker than standard tanks. Far superior to plastic bottle generators, they're more durable, stable, safe, and high-pressure resistant.
Premium Safety Protection -- Automatic pressure relief valve activates when CO2 pressure exceeds 30-35KG. 12V waterproof solenoid valve prevents leakage risks for complete safety.
Tips for All Users -- The required powders to generate CO2 gas are not included; you will need purchase the citric acid and sodium bicarbonate powders separately. NOTES: (1) The motorized valve may make a soft sound when turning on/off this is normal and not a fault. It runs quietly during normal operation;(2) Soak the diffuser in your aquarium for 24 hours before use. If bubbles aren't released right away, wait briefly due to low initial air pressure. If problems continue, check tube connections for leaks;(3) The motorized valve is not waterproof. Avoid contact with water to prevent damage.
Professional DIY kit -- A complete system in 2L size bottle, that includes SUS304 stainless bottle, regulator, Solenoid valve Filter, precision needle valve, and easily adjustable bubble counter, ect
High Precision -- having the 12V solenoid on a timer, you can specify when you want CO2 injection on and for how long. Bubble counter with check valve built-in. It stops water from back flowing into your CO2 tank.

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Our Best Overall Choice

Best Choice

9.7

CO2BAG

CO2BAG® M – Natural CO₂ Generator for Indoor Plants & Greenhouses | Boosts Growth, Yield, Taste & Color | Compact, Safe & Maintenance-Free

Free Shipping

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

Accelerated Plant Growth & Higher Yields: Consistent CO supply helps plants photosynthesize more efficiently, leading to faster growth, quicker fruit ripening, and bigger, healthier harvests.
Effortless & Maintenance-Free: No tanks, regulators, or electricity required. Just hang the bag in your grow space and enjoy natural CO enrichment for weeks.
Safe for Plants & People: Releases CO steadily and safely, creating the ideal growing environment for indoor grow rooms and greenhouses without risk.
Compact Yet Powerful: Effective for areas up to 2m² (for size M), making it the perfect solution for hobby growers, small tents, or compact greenhouses. Its a budget-friendly alternative to expensive CO systems.
Satisfaction Guaranteed: We stand behind the effectiveness of every CO2BAG. If youre not fully satisfied with the results, well make it right grow with confidence.

Show Price

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