Sentinel - Total Environmental Controller - Cooling/Heating/Humidity/CO2 (CHHC-4) (703211)

Model: 703211

The Sentinel CHHC-4i is the most advanced CO2 controller available on the market today. It incorporates the proprietary S.I.C.E. – Sentinel Intelligent CO2 Enrichment – communication and control components and programming that are unique to Sentinel. It allows for communications between Sentinel S.I.C.E series products, providing a level of control never before seen in your greenhouse, garden or grow room. The system works by a Sentinel S.I.C.E. series controller, such as the Sentinel CHHC-4i, measuring and monitoring your growing environment. As the atmospheric CO2 levels change, the controller will tell the Sentinel ICG series generator to increase output, decrease output or go into idle mode...all computer controlled. As the optimal conditions are reached, the S.I.C.E. system can decrease Co2 output, making sure that the user defined optimal level is not overshot.

Comes With:

  • New quick-disconnect on remote combo sensor for temperature, humidity, CO2 and light level. The combination sensor can be placed 16 feet from unit.
  • There are 3 environmental conditions which must be controlled for productive indoor growing. The CHHC-4 makes it easy to accurately control your "atmosphere" inside the area.
  • Temperature: The CHHC-4 has 2 separate outputs to control cooling and heating.
  • Humidity: The CHHC-4 can either increase or decrease the amount of humidity inside the area.
  • CO2 PPM: The CHHC-4 controls carbon dioxide with Part-Per-Million accuracy
  • The user can set separate day and night settings for temperature and humidity. The CO2 is activated only during the "day" and has several modes of operation.
  • Besides controlling your growing area, the on-board memory stores the highest and lowest measurements to verify proper conditions are maintained.
  • No complicated menus to negotiate... the simple push buttons and LED display makes it EASY! The CHHC-4 uses a simple "operator interface" to access the settings and to recall the minimum and maximum recorded readings for CO2 level, temperature and humidity.


  • Controlled with Part-Per-Million accuracy.
  • Bright GREEN LED display shows the Temperature, Humidity and CO2 levels
  • Fuzzy logic mode can be used with compressed CO2 for greater accuracy.
  • The CHHC-4 is an all-in-one environmental controller.
  • All functions can be controlled individually. You set both high and low temperatures for the Day and Night... the CHHC-4 figures out the rest.
  • It has multiple modes of operation.
  • Cooling devices such as ventilation fans or air-conditioners connect to the cooling device receptacle.
  • A separate humidifier or dehumidifier can have separate Day and Night settings and is connected to the humidity device receptacle.

How To Use:

  • Connect your CO2 generator or compressed CO2 solenoid / regulator assembly to the CO2 receptacle


Power Input 100 to 265V~
Circuit Breaker Rating 15 amp @ 240V~
Receptacle Rating 15 amp @ 120V~
10 amp @ 240V~
Temperature +/- 1.5'F / 32 to 120'F
Humidity +/- 3%rH / 10 to 90%rH
CO2 PPM +/- 85PPM / 350 to 2500PPM/td>

Weight: 14 lb.
Dimensions: 13in. × 9in. × 7in.
List Price: $689.95