Google Nest Learning Thermostat. Get a 5 year warranty when purchased and installed through a Nest Pro. Customer should check HVAC compatibility prior to purchase. Proven energy savings in independent studies suggest an average of 10% to 12% on heating bills and 15% on cooling bills. Add Google Nest Temperature Sensors to improve accuracy. For homes and business! Works with MOST 24V systems up to 3H/2C. Remote control your new thermostat with your android or iphone device, requires an active internet connection and wifi.