Aprilaire 8300 series thermostats include a large back-lit display that reads "Done" at the end of programming, and built-in alerts that indicate when air-cleaner filters and humidifier water panels need changing. The units are available for both heat/cool, including multi-stage, and heat-pump applications. Programmable and non-programmable versions are offered for each application.

Research Products Corp., P.O. Box 1467, Madison, WI 53701; (608) 257-8801; (608) 257-4357.

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