CO2 Enrichment

Carbon Dioxide can be depleted rapidly in an indoor environment, causing plant growth to slow down or even stop. The most basic approach is to ensure sufficient and consistent ventilation and air exchange in the garden area. (See Ventilation & Air Exchange products). Proper ventilation should provide normal outdoor or household CO2 levels of about 300 parts per million (ppm). However, many indoor or greenhouse gardeners intentionaly add CO2 to the air to increase rates of photosynthesis. CO2 can be added using bottled CO2, compressed gas available at industrial welding or gas supply companies. It may also be added to larger areas using CO2 generators, which burn liquid propane or natural gas to create CO2.

CO2 Enrichment Systems for CO2 Bottles/Tanks

Hydrofarm Low Flow CO2 Enrichment System

This System is similar to the CAP CO2 system, but has a lower flow rate to release CO2 more slowly. This unit is suitable for small garden areas where air is not exhausted or exchanged frequently. Requires 15-30 minutes to release the necessary amount of CO2. Standard timer and 10 ft of vinyl tubing are included.  $139.95

Hydrofarm High Flow CO2 Enrichment System

This System has a the ability to provide a much higher flow rate than the Hydrofarm Low Flow CO2 controller, making this the reccomended system for larger gardens that need to fill quickly. Timer and tubing included. $144.95

Digital Timer

This programmable timer will run for as little as one minute, with up to six different settings every day. A battery backup remembers your settings if the power supply is interrupted. 1-year warranty. $17.95

CO2 Generators

A specialized generator burns a controlled flame to release carbon dioxide into the environment. This method produces the lowest cost per unit of CO2- less than half that of bottled gas! CO2 generators are available for a natural gas or liquid propane fuel supply. Generators are sold according to the volume of CO2 produced per hour. 2-year limited warranty, 90-day warranty on electrical components. Please email for additional information.

AHL stocks LP only but can special order or drop ship natural gas models. Generators can also be calibrated for specific elevations over 3500'. Let us know when ordering if you are below 3500' or above 6500', and what the approximate elevation is.

Sentinel CO2 Generator

The Sentinel VCG-27 comes complete with 10 clean burning brass burners pre-installed that produce from 6 up to 27 cubic feet/hr of CO2. Two selector valves make setting the output easy. Electronic ignition standard, tip-over switch standard, dual redundant solenoids standard, ease and reliability standard. Comes with the appropriate regulator and 10ft hose.

• Sentinel CO2 Generator, $679.95

CO2 Test Kit

Simple testing device to determine the level of CO2 in your atmosphere. Includes two test tubes, each good for a single test. 

• CO2 Test Kit,$14.95
• Replacement CO2 Test Tubes, each...$4.95

Sentinel CHHC-1

The Sentinel CHHC-1 controls CO2 levels with part-per-million accuracy. It is reliable, accurate and simple to use. You can select Fuzzy-logic mode or Generator mode when using a generator. The remote CO2 and light sensor allows the user to place the sensor up to 16ft from main controller.

• Sentinel CHHC-1, $724.95