Trane ComfortLink II XL850 Wi-Fi Smart Thermostat, Programmable Touchscreen Control, Replaces TCONT900AC42UAA Models TCONT850AC52UA, TCONT824AS52DC, Z-Wave Certified, Cert ID: ZC08-14090003 by Trane March 18, 2025 by Singh … Read the rest “Trane ComfortLink II XL850 Wi-Fi Smart Thermostat, Programmable Touchscreen Control, Replaces TCONT900AC42UAA Models TCONT850AC52UA, TCONT824AS52DC, Z-Wave Certified, Cert ID: ZC08-14090003 by Trane”