Kidde HD135F Heat Detector - Hardwired with Battery Backup & Interconnect (Garage)

Reliable heat-based protection for spaces where smoke detectors aren’t ideal

The Kidde HD135F Heat Detector is a 120V hardwired alarm with a built-in battery backup, designed to sense rising temperatures rather than smoke. Its 85 dB alert profile helps alert occupants when temperatures hit about 135°F, offering an early warning in areas where smoke detectors may cause nuisance alarms—such as kitchens, garages, or attics.

Because power can dip or fail, this detector includes a 9-volt battery backup to keep protection active during outages. Two LEDs provide at-a-glance status: a green light confirms AC power, while a red LED flashes to indicate normal operation or sounds rapidly when the unit is alarming. This combination supports quick checks and easy troubleshooting in busy spaces.

Key benefits at a glance

• 135°F heat detection paired with an audible 85 dB alarm for early warnings.
• Hardwired with battery backup for continued protection during outages.
• Interconnect capability supports up to 24 Kidde devices, with clear NFPA limits to manage alerts across rooms.
• Fast installation thanks to a quick-connect power harness and a tamper-resist pin for added security.

The unit is UL certified and backed by a 5-year limited warranty, offering dependable protection for households that need reliable heat detection in specific zones. A Test/Hush button makes routine checks simple, and the design helps minimize false alarms from routine cooking, steam, or dust when used in appropriate spaces.

Real-life use scenarios

• Garages: monitors hot spots near vehicles, tools, and stored items where nuisance alarms are common with smoke detectors.
• Kitchens and attics: provides an extra line of defense without triggering frequent false alarms caused by cooking smoke or dust.
• Interconnected safety networks: can be paired with other Kidde devices to create a multi-station alert system while respecting NFPA limits.

With its compact mounting, intuitive wiring, and clear indicator LEDs, the HD135F is designed to blend into utility and living spaces alike while delivering practical, non-dramatic alerts when temperatures rise quickly. Consider it as part of a layered approach to home safety in areas where heat becomes a concern and traditional smoke detectors may not be ideal.