Smart Thermostat (ADC-T25)

Why Choose This with Smart Shield Systems

• No-C-wire? No problem. We wire the T25 for battery operation when a common wire isn’t available, then complete auto-configuration and testing.

• HVAC done right: We configure the Z-terminal for what your system needs—2nd-stage heat/cool (W2/Y2), O/B, zoning, humidifier, dehumidifier, or ventilation (HRV/ERV/external baffle)—and verify operation.

• Smart automations: We build Alarm.com scenes & schedules and enable Pro HVAC Monitoring so you get health reports and proactive service options.

• Secure Z-Wave setup: We join with SmartStart + S2 (with Long Range) for reliable performance on large properties.

Key Features

• Capacitive-touch / OLED interface for quick setup and everyday control.

• HVAC Wire Detection & Auto-Configuration shortens install time.

• Runs on 24 VAC or 4×AA batteries—no C-wire required.

• Z-Wave SmartStart, S2, and Long Range; full Alarm.com integration (scenes, energy schedules, Pro HVAC Monitoring).

• Humidity & ventilation control; works with Alarm.com Temperature Sensor accessories.

Product Specifications (At-a-Glance)

• Model: ADC-T25 (Alarm.com Smart Thermostat)

• Power: 24 VAC or 4× AA batteries (long battery life; no C-wire required)

• Display: Capacitive-touch / OLED

• Communications: Z-Wave (SmartStart, S2, Long Range)

• Dimensions: 4.7 × 4.7 × 1 in (12 × 12 × 2.6 cm)

• Operating temp: 41–95 °F (5–35 °C)

• Compatible systems: Near-universal 24 VAC—forced air, heat pump (O or B), dual fuel, radiant; up to 3 heat / 2 cool; humidifier, dehumidifier, ventilation (HRV/ERV/external baffle) via Z-terminal.

• Platform features: Alarm.com Scenes, Energy-Saving Schedules, Pro HVAC Monitoring.

Compatibility Notes

• Works with most 24 VAC HVAC systems and integrates with Alarm.com for app control and automations. Supports Z-Wave Long Range for bigger homes.

• Accessory support: compatible with Alarm.com Temperature Sensors for better room-by-room comfort.

Popular Use Cases

• No-C-wire retrofits in older homes (battery operation)

• Dual-fuel & multi-stage systems needing Z-terminal flexibility (W2/Y2/O/B)

• Humidity/ventilation control with HRV/ERV integration

Frequently Asked Questions

Does the ADC-T25 require a C-wire?

No. It can run on 4× AA batteries when a C-wire isn’t present, and it auto-detects wiring during setup.

Which HVAC systems are supported?

Nearly all 24 VAC systems: forced air, heat pumps (O or B), dual fuel, and radiant, with up to 3H/2C staging plus humidifier/dehumidifier/ventilation options via the Z-terminal.

Is it secure and future-proof on Z-Wave?

Yes—Z-Wave SmartStart for easy joins, S2 security, and Z-Wave Long Range support for extended coverage.

Can it help me save energy or spot HVAC issues?

Yes—Alarm.com Scenes & Energy-Saving Schedules plus Pro HVAC Monitoring (opt-in) provide automation and system-health insights with reports and service notifications.

Does it work with remote temperature sensors?

Yes—the T25 is compatible with Alarm.com Temperature Sensors to fine-tune comfort.

Ready for Smarter Comfort?

Smart Shield Systems will install and configure your ADC-T25, set up scenes/schedules, and tune humidity or ventilation—so your home stays comfortable and efficient, automatically.