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AprilAire S86NMU Programmable Multistage Universal Thermostat


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WARNING: Cancer and Reproductive Harm –


Update Control of Your HVAC System with a Modern Thermostat

Control virtually any HVAC or heat pump system with the AprilAire S86NMU Programmable Multistage Universal Thermostat. This thermostat provides a capacitive touch interface to command multistage HVAC and heat pump systems. A colorful 2.4" display clearly presents indoor temperature and humidity, with the option for adding a wired external sensor to monitor outdoor temperature. An array of intelligent features compliment its modern design, including programmable temperature schedules, Progressive Recovery for pre-heating/pre-cooling prior to scheduled temperature setpoints, and HeatBlast function for rapid heating within a short period of time.

  • Programmable thermostat with 24/7-day programmability
  • Universal design works with 2H/2C or 4H/2C heat pumps
  • Colorful 2.4" display clearly presents indoor temperature and humidity
  • Real Language Setup simplifies installation and daily use
  • Progressive Recovery feature meets temperature setpoint before next scheduled temperature event
  • HeatBlast feature quickly raises indoor temperature by 3°F to 5°F
  • Optional connection to wired sensor (8052) to detect and report outdoor temperature

Prep Your Home for Scheduled Events with Intelligent Automation

This AprilAire Thermostat offers standard daily and weekly schedule programming, allowing users to set various customized temperature setpoints throughout the week according to their desires and unique schedules.

The "Progressive Recovery" feature activates your heating or cooling equipment BEFORE a scheduled event, so that when it's time for the event to start, your home has already reached your desired temperature. Program the thermostat, for example, to remember what time you arrive home from work, and the thermostat will bring the house to the desired temperature before you reach your front door.

Similar to the Progressive Recovery feature, this AprilAire Thermostat includes a HeatBlast feature, which fully activates your heating system, including dual fuel systems, to raise indoor temperatures between 3 °F to 5°F within a relatively short period of time.


  • Thermostat
  • Mounting Hardware

AprilAire: Feel Good, Inside

It is the mission of AprilAire to provide superior Indoor Air Quality products for new and existing homes and businesses. AprilAire products are built to provide you and your family with the most comfortable home and the cleanest, healthiest air possible. Protect your home and your most valuable possession – your family.


  • Manufacturer Part #: S86NMU
  • UPC: 686720007705
  • Color Graphical Display: 2.4-inch
  • Power: 24V (C-Wire required)
  • Heat/Cool Stages: 2H/2C
  • Heat Pump Stages: 4H/2C
  • Navigation/Set-Up: Real Language
  • Environment:
    • Operating Temperature: 32° to 120°F (0° to 48.9°C)
    • Operating Humidity: 5% to 90% Relative Humidity
  • Electrical:
    • Operating Voltage – 24VAC (18-30VAC)
    • Current – Maximum: 2.5A (total), 1.0A (single output)
  • Thermal Measurements:
    • Display Range Room Temperature: 32° to 99°F (0° to 40°C)
    • Outdoor Temperature: -40° to 130°F (-40° to 55°C)
    • Setpoint Temperature Ranges:
      • Heat: 40° to 90°F (4° to 32°C)
      • Cooling: 50° to 99°F (10° to 37°C)
    • Setpoint Humidity Range: 10% to 50% R.H.
  • Dimensions: 4.38 L x 4.38 W x 0.80 D
  • Warranty: 5-Year Limited