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The Bard 8403-090 is an OEM programmable thermostat used on Bard air conditioner and heat pump applications where multi-stage control is required, supporting 3 heat and 2 cool on heat pump systems and 2 heat and 2 cool on conventional air conditioning setups. This thermostat is designed for dependable day to day operation with contractor friendly installation features like straightforward wiring, battery backup, flexible scheduling, and automatic changeover to maintain comfort without constant adjustments. If your existing controller is failing, inaccurate, or outdated, replacing it with the correct Bard 8403-090 helps restore proper staging and reliable system control while keeping compatibility aligned with Bard equipment requirements.