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The Nest Thermostat should be installed by a professional. The Nest Thermostat works in most homes. It figures out what system you have and turns on the right features for you.

Generation	3rd Generation
Color	Stainless Steel
Screen	24-bit color LCD 480 x 480 resolution at 229 pixels per inch (PPI) 5.3 cm diameter
Languages	English (US, UK) Dutch French (Canada, France) Italian Spanish (Americas, Spain)
Compatibility	The Nest Learning Thermostat should be installed by a professional. The Nest Thermostat works with most of 24V heating and cooling systems, including gas, electric, forced air, heat pump, radiant, oil, hot water, solar and geothermal. Heating: 1,2, and 3 stages (W1, W2, W3) Cooling: 1 and 2 stages (Y1, Y2) Heat pump: with auxiliary and emergency heat (O/B, AUX, E) Humidifier or dehumidifier (HUM, DEHUM) Fan (G) Power (C, RH, RC)
Sensors	Temperature Humidity Near-field activity Far-field activity Ambient light
Wireless	Wi-Fi 802.11b/g/n @ 2.4GHz, 5GHz 802.15.4 @ 2.4GHz Bluetooth Low Energy (BLE)
Size and weight	Display Mass: 205.4 g Diameter: 8.4 cm Height: 2.69 cm Base Mass: 38.3 g Diameter: 7.6 cm Height: 1.1 cm Assembled Mass: 243.7 g Diameter: 8.4 cm Height: 3.08 cm
Battery	Built-in rechargeable lithium-ion battery
Power consumption	Less than 1 kWh/month
Remote control requirements	Wi-Fi connection with internet access Nest app on phone or tablet with Android or iOS. See the Nest app reqiurements for supported versions. Latest version of Safari, Chrome, Firefox or Internet Explorer on Mac OS X v10.9 or later and Windows 7 or later
Multi-home support	Multi-zone homes You can control up to 20 thermostats per home.
Multi-home support	Nest in three homes You can control Nest Thermostats in three locations from one Nest account.
Warranty	2-year limited warranty.
In the box	Display Base Optional trim kit Mounting screws and labels Nest screwdriver Installation Guide Welcome Guide