Experience seamless temperature control with the Honeywell Q539C 1020 Thermostat Subbase, designed specifically for compatibility with T87F thermostats. Ideal for those looking to enhance their HVAC system's performance, this subbase is a top pick for its reliability and ease of use. Each purchase includes a pack of three, ensuring you have multiple bases for simultaneous temperature readings throughout your space. With its straightforward installation process, you'll be up and running in no time, enjoying precise and consistent climate management. Plus, enjoy the convenience of free shipping on your order.