Battery type CR2450 x1
Battery life (stand-by) 3 years (typical)
Does not use battery while HVAC is turned on or “C” wire connected.
Range 700ft (210m) line of sight (at default setting.)
HVAC Compatibility If you see a wire shorting “Rh” and “Rc” in your exsiting thermostat, Kumostat is compatible.
Supports < 20VA, 24Vac rated coil. Supports 3 stage heating and 2 stage cooling HVAC systems with fan and reverse valve (7 relays total). Completely programmable wiring allows the 7 relays to be assigned to any kind of desired function. For example
  • 2 stage heating / 3 stage cooling
  • 2 stage heating / 2 stage cooling / 2 stage fan
  • 2 stage heating / 1 stage cooling / 3 stage fan
Relative Humidity +/-2% RH error, 10-bit resolution (0.12% step)
Logging and notification
Temperature Operation range: -40°C (-40°F) to 85°C (185°F)
Sensor accuracy: +/-0.4°C typical
Sensor quantization level (resolution): 13-bit, 0.02°C step
Logging and notification
Dimensions Height: 4.3 inch (110 mm)
Width: 2.5 inch (64 mm)
Thickness: 0.9 inch (23 mm)

Through our minimalist approach of just providing the radio for Internet connectivity, internal temperature+humidity sensor and solid state relay for multi-stage HVAC control, we are able to provide a thermostat that allows all the learning algorithms thermostats like Nest provide and much more (you have various external sensors to play with, and there is no limit what kind of algorithms you can create in KumoApp), at fraction of the cost.

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FCCID: ZGW09. FCC Compliance Statement: This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Caution: Any changes or modification cautions to this device not explicitly approved by manufacturer could void your authority to operate this equipment.