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    AprilAire 8400 Series IAQ Controls Thermostats — Specifications

    September 08, 2026 2 min read

    Specifications for the AprilAire 8400 Series IAQ Controls Thermostats, covering non-programmable and programmable models 8444–8476W.

    💾 Download Original PDF
    Full text manual (for reference)

    Specifications sheet for the AprilAire 8400 Series IAQ Controls Thermostats, a line of non-programmable and programmable thermostats with built-in indoor air quality (IAQ) control features.

    Model Lineup

    Model Type Configuration
    8444 Non-Programmable 1H/1C
    8446 Non-Programmable 2H/1C HP
    8448 Non-Programmable Universal 2H/2C or 4H/2C HP
    8463 Programmable 1H/1C
    8465 Programmable 2H/1C HP
    8466 Programmable Universal 2H/2C or 4H/2C HP
    8476 Programmable Universal 2H/2C or 4H/2C HP, Event-Based™ Air Cleaning
    8476W Programmable, Wi-Fi Universal 2H/2C or 4H/2C HP, Event-Based™ Air Cleaning, 7-day

    Features & Benefits

    • Large backlit display with high-contrast LCD
    • Built-in dual fuel control (auto lock-out of compressor with call for fossil fuel aux heat)
    • Circulate fan mode for better indoor air quality
    • Built-in user manual and maintenance reminders (water panel, air filter, dehumidifier, HVAC service indicators)
    • High and low balance point with outdoor temperature sensor (requires 8052 accessory)
    • Free custom-imprinted covers, bumper-to-bumper 5-year warranty
    • Dual powered — battery or hardwired (non-Wi-Fi models only)
    • Compressor lockout protection, display temperature offset (+/-4°)
    • Configurable as manual heat/cool or auto changeover; adjustable differential for 1st–4th stage
    • Displays room temperature, temperature setting, and outdoor temperature simultaneously (requires 8052 sensor)
    • Removable front access battery cover; soft-touch keys; Fahrenheit & Celsius

    Programmable Models Only

    • Override program schedule at any time
    • Progressive recovery
    • Permanent program retention during power loss
    • Indefinite setpoint hold
    • 5/1/1 day or 5/2 day programmable (7-day only on Model 8476W)

    Model 8476 & 8476W Only — Event-Based™ Air Cleaning

    The Clean Air button controls and confirms air cleaning system operation, with five modes:

    • ON 24/7 — Full-time, non-stop air cleaning
    • AUTO — Cleans air when there is a heat or cool call
    • CIRC 30/HR — Circulates and cleans the air 30 minutes each hour
    • EVENT 3 HR — Cleans for a 3-hour period (e.g. during vacuuming or a party)
    • ALLERGY 24 HR — Cleans continuously for 24 hours during high-allergy periods

    Specifications

    Category Spec
    Dimensions 5.25" x 4.50" x 1.00"
    Individual carton 5.80" x 4.80" x 1.75"; 10 units per master carton
    Control range 45°F to 99°F (7°C to 32°C)
    Display range 32°F to 99°F (0°C to 40°C)
    Accuracy +/- 1°F (+/- 0.5°C)
    Storage temperature -30°F to 140°F (-34.4°C to 60°C)
    Operating humidity 5% to 90% RH
    Operating ambient temp. 32°F to 120°F (0°C to 48.9°C)
    Electrical 24 VAC (18-30 VAC); 1 amp max per terminal, 2.5 amp total max (all terminals)
    Compatible systems Standard gas/oil/electric, single-stage/heat pump/multi-stage, millivolt systems
    Terminal designations Rc, R, W, Y, G, C, S1, S2, O/B, L, W2, Y2

    Accessories

    8052 Outdoor Temperature Sensor — required for high/low balance point control and outdoor temperature display.