Jackson Systems

Aprilaire 8466 Universal Programmable Heat Pump Thermostat

BRAND: Aprilaire SKU: 8466

(2 customer reviews)


MSRP: $93.14
You save 15%

Universal Programmable Heat Pump Thermostat

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Model 8466 is universal and will control – Standard Systems gas / oil / electric. Single Stage/Heat Pump/Multi-Stage, Millivolt Systems


  • Large 4.5 square inch LCD with high contrast for easier reading
  • Controls 3 Stages Heat / 2 Stages Cool
  • Bright, white backlit display is easy to read
  • Easy to use temperature control and override program schedule at anytime
  • Progressive recovery
  • Permanent program retention during power loss
  • Indefinite setpoint Hold
  • Choice of 5/1/1 day programmable, or 5/2 day
  • Displays room temperature, temperature setting and outdoor temperature (with 8052 sensor) simultaneously
  • Removable battery cover for fast, easy replacement
  • Dual fuel operation built in – eliminates need for a dual fuel kit (requires 8052 outdoor temperature sensor)
  • Dual Powered…choice of battery powered or hardwired, for all applications
  • Easy-to-wire terminal block
  • Millivolt compatible
  • Outdoor temperature (requires 8052 outdoor temperature sensor)
  • Permanent memory retention during power outage
  • Water panel, air filter, dehumidifier and HVAC service indicators
  • Simple "set-up" menu to activate optional features
  • Soft-touch keys
  • Circulate fan mode (if the fan has been off for 20 minutes the fan will be activated for a 10 minute cycle. Use this mode for a balance of energy savings and air circulation/cleaning)
  • Compressor lockout protection
  • Quick reference instructions on board
  • Display temperature offset (+/-4º)
  • Fahrenheit & Celsius
  • Configures as manual heat/cool, or with auto changeover
  • 5 year warranty
  • Adjustable differential for 1st, 2nd, 3rd stage


  • Terminals: Rc, R, W, Y, G, C, S1, S2, 0/B, L, W2, Y2
  • Operating voltage 24 VAC (18 – 30 VAC)
  • Current – Maximum: 2.5A (total), 1.0A (single output)
  • Maximum surge current: 5A
  • Power supply Dual power. Can be battery or 24 VAC powered (When both the sources are available, battery will be used as back up power.)
  • Battery power: AA size alkaline battery x 2
  • Battery life: Approximately 1 year
  • Outdoor temperature sensor Maximum distance: 300 feet
  • Room temperature measurement Display range: 32° to 99°F (0° to 40°C)
  • Outdoor temperature measurement Display range: -20° to 130°F (-30° to 55°C)
  • Temperature setting range
  • Heat: 45° to 90°F (7° to 32°C)
  • Cool: 50° to 99°F (10° to 37°C)
  • Dimensions: 5.25" x 4.50" x 1.00"

Features and Benefits

  • Up to 3H/2C conventional or heat pump systems, millivolt compatible
  • 5/1/1 or 5/2 day programmable
  • Large 4.5 in2 LCD screen with high contrast
  • Easy-to-use temperature control and override program schedule
  • Progressive memory
  • Indefinite setpoint hold
  • Displays outdoor temperature with optional outdoor sensor (8052)
  • Removable battery cover for easy battery replacement
  • Easy-to-wire terminal block
  • Permanent memory retention
  • Water panel, air filter and service reminders
  • Circulate fan mode
  • Auto or manual changeover
  • Hardwired or battery powered
  • 5-year warranty

Additional information

Power Type


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Auto Changeover



Terminal Designations

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4 Heat/2 Cool Heat Pump





UPC 686720846601
Imprinting Available Yes

2 reviews for Aprilaire 8466 Universal Programmable Heat Pump Thermostat

  1. keith schoeck (verified owner)

    Very prompt shipping and delivery as promised

  2. Craig (verified owner)

    Came promptly and delivered ordered product

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