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The Honeywell Q539C1020 Thermostat Subbase is designed for cool-only HVAC systems. This model provides a reliable switching mechanism for controlling the heating and cooling functions.
This subbase includes two switches for operation and provides a cooling anticipator feature. It serves as a functional replacement for various obsolete models.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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