Sentinel UTC-1 Universal Temperature Controller 

Temperature should be the first priority when considering how a grow room will be setup. The Sentinel UTC-1 Universal Temperature Controller solves the Day and Night temperature difference problem by taking temperature control and monitoring to the next level for a variety of set-ups. 

Simple to use, the 100% digital UTC-1 temperature controller provides a photocell that allows separate Day and night temperature settings. It has an easy-to-use menu, simple pushbutton programming and a bright LED display that's easy to read.

It also records and recalls minimum and maximum temperature levels. The Sentinel UTC-1 features a Heating or Cooling mode with adjustable dead band (Hysteresis) and 16 foot remote probe. Readings can be set in either Fahrenheit or Centigrade measurements.

Two receptacles control up to 15-amps of power. The UTC-1 also has a built-in, re-settable circuit breaker.

Specs:

Temperature Measurement Range: 32° F to 140° F
Min / Max operating temperature: 32 to 120° F
Min / Max Humidity: 0-99% RH
Temperature Accuracy: +/- 1° F
Amps / Volts requirements: 15 amps @ 120 volts
Dimensions: 8" high x 6.45" wide x 3.1" deep
Weight: 7 lbs
Life Expectancy: 10+ years

More info from the Manufacturer (PDF format - Lots of detail.)