LuxPro PSD011W Digital Non-Programmable Thermostat Compatible With: Most 24V Heating and A/C Systems 1 Stage Heat / 1 Stage Cool: Gas, Oil, Electric, or Single Stage Heat Pump 2 Wire Heat Only Hydronic Systems (Hot Water Baseboard & Radiator) Not Compatible With: Multi-stage Heat Pumps 3 Wire Hydronic Systems Line Voltage Systems (120 / 240 VAC) Millivolt Systems (Wall Heaters / Furnaces & Gas Fireplaces) Application: Single Stage (Heat/Cool) - Stages: 1 Heat/1 Cool Non-Programmable