Ambient Temp Sensor

Yes. The SCW-120-15A WiFi switch includes built-in WiFi and connects to the WarmlyYours SmartControl app. From your smartphone you can turn the deicing system on or off remotely, create manual schedules, and monitor system status from anywhere with an internet connection.

For automatic operation combined with remote monitoring, you can pair an automatic control (SCP-120, SCE-120, or SCA-DUAL) with the aerial sensor—the system runs itself based on real weather conditions while you can still check in remotely using the SCW-120-15A if needed for manual override.

The other controls (SCP-120, SCE-120, SCA-DUAL, SCM-DUAL, AIR-STAT) are standard hardwired controls without built-in WiFi connectivity.

Each WarmlyYours roof deicing control has a maximum rated load:

• SCV-DUAL — 16A (built-in sensor, outdoor-rated enclosure)
• SCP-120 — 24A at 120V
• SCA-DUAL — 30A at 240V
• SCE-120 — 3 × 16A (three-zone control)
• SCM-DUAL — 20A at 120V; 10A at 240V or 277V
• SCW-120-15A — 15A at 120V only (larger loads or other voltages need a relay panel)
• AIR-STAT — 22A resistive (rated at 125, 250 and 480 VAC); one circuit per control

If your roof deicing installation exceeds the capacity of a single control—common for large commercial rooflines, multiple gutters, or multi-zone systems—you will need a relay panel. A relay panel uses the low-current signal from your control to switch heavy-duty contactors, allowing a single control to manage a system far larger than it could handle directly.

Our free system design service will confirm whether a relay panel is required for your installation and which model is correct.

The Aerial Sensor (AIR-SS-2) is a standalone sensor that mounts above the heated area—typically on a fascia board, eave, or exterior wall post. It continuously monitors two conditions:

• Air temperature — Checks whether outdoor temperature is below freezing (or close to it).
• Precipitation — Detects the presence of snow, rain, or ice above the sensor.

When both conditions are met (cold enough + moisture present), the sensor signals the automatic control to activate the roof deicing system. When conditions improve—the temperature rises or precipitation stops—the system shuts off.

The aerial sensor is compatible with the following automatic controls: SCP-120, SCE-120, and SCA-DUAL. It mounts externally and does not require embedding in the roof structure, making it suitable for both new and retrofit installations.

Automatic controls use an aerial sensor to monitor outdoor conditions and activate your roof deicing system only when temperatures are cold enough and moisture is present. The system turns on when it is needed and shuts off automatically—you never have to think about it. This is the recommended approach for most installations because it prevents ice dams before they form and avoids running the system unnecessarily.

Manual controls give you direct on/off control of the system:

• The SCM-DUAL contactor switch includes a 24-hour programmable timer so you can schedule fixed operating windows during known storm hours.
• The SCW-120-15A WiFi switch lets you turn the system on or off remotely from a smartphone app, and also supports manual scheduling.

Automatic controls are strongly recommended for roofs and gutters in climates with frequent freeze-thaw cycles or unpredictable weather. Manual controls are a lower-cost option for small installations or properties where someone can monitor conditions closely.

Turn on roof heating cables before snow falls when temperatures drop to 32°F (0°C) or below and freezing precipitation is forecast.

For optimal protection, automatic controls are recommended to activate cables only when both freezing temperatures and moisture are detected.

• Automatic operation: Aerial or gutter sensors detect moisture and cold temperatures, turning the system on before snow accumulates and off when dry.
• Manual operation: Turn cables on when freezing precipitation is expected, and turn them off once snow and ice have melted and drained.
• Critical range: Maintain operation between 10°F and 34°F, the peak range for ice dam formation.
• Post-storm drainage: Keep cables on for 2 to 4 hours after precipitation stops to ensure meltwater drains fully.

Using automatic controls prevents unneeded run time compared to continuous manual operation. Shop roof and gutter controls.