Programmable thermostat, heat pump thermostat, digital electronic thermostat
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Give your old-school heating and cooling system a higher education. The simple addition of a programmable thermostat allows you to create personalized programs based on your lifestyle, enabling you to heat or cool your home when you need it—reducing energy costs. In fact The U.S. Department of Energy recommends programmable thermostats to save up to 30% on heating and cooling bills.Most thermostats are designed around your heating and cooling system. The Aprilare 8400 Series Programmable Thermostats are designed around you.

Features & Benefits
The 8400 Series Programmable Thermostats are easy to program and offer a combination of simplicity, value, reliability, comfort and style. Other benefits include:


  • Easy to Use Temperature Control and ability to override the program schedule at any time.
  • Progressive Recovery assures that the heating and cooling equipment starts at the optimum time to reach chosen temperature by the time you want it.
  • Choice of 5/1/1 Day or 5/2 Day Programming. This allows for customization of your weekday and weekend schedule based on your needs.
  • Large LCD Screen with high contrast - for easy reading.
  • Outdoor Temperature Reading for convenience and comparison (requires optional outdoor temperature sensor).
  • Circulate Fan Mode means your model 8400 series thermostat monitors your HVAC system to ensure the HVAC fan operates for some time every hour to provide better indoor air quality plus reduces hot and cold spots within your home.
  • Service Reminder tells you when you should change your air filter to protect your equipment and water panel to keep your humidifier running in optimum condition. It also can remind you to service your equipment or whole-home dehumidifier to insure the longevity of your investment.

Which Model is Right for Me?
Aprilaire offers an entire family of programmable thermostats that are designed to work with just about any heating and cooling system. Ask your Aprilaire dealer if you have any questions on which 8400 model is right for you.

Model 8463 Programmable Thermostat—Heat/Cool 5/2 or 5/1/1 Day Programming. Also can display outdoor temperature.

Model 8465 Programmable Thermostat—Heat Pump 5/2 or 5/1/1 Day Programming. Also includes an additional Emergency Heat (E-Heat) mode. Also can display outdoor temperature.

Model 8466 Programmable Thermostat—Multistage Heat Cool or Heat Pump 5/2 or 5/1/1 Day Programming. Also can display outdoor temperature.

Model 8476 Programmable Thermostat—combines the features of the Aprilaire Model 8466 universal, programmable thermostat with Event Based Control of the HVAC system's fan. This allows you to automatically circulate air throughout your home periodically throughout the day or for a specific period of time to provide greater comfort through cleaner air and more even temperatures. The 8476 will also tell you when it is time to change the air filter.