The ProStat PSP2270 Premier Universal Programmable Smart WiFi Thermostatis compatible with multi-stage conventional or heat pump systems with up to three stages of heating and two stages of cooling and heat pump systems with one compressor and up to one auxiliary stage.

Standard Features:

• Single-stage conventional or heat pump systems
• Multi-stage heat pump systems up to 2 heat / 2 cool
• Multi-stage conventional systems up to 2 heat / 2 cool
• No common (C) wire required for Wi-Fi on most systems.**
• 7 Day, 5-2 Day or Non-Programmable
• Large 3 sq. in. backlit display
• Bright blue backlight
• Auto or manual changeover
• User and installer lock modes
• SmartLimit™ temperature limits
• Auxiliary heat fossil fuel option
• Hardwire or battery powered
• Circulating fan mode
• ROHS Compliant
• Wi-Fi works without common (C) wire on most systems; requires common on heat pump, heat only or cool only systems