IQ Extreme Temperature Sensor


Not too hot. Not too cold. Just right.

Be alerted when a room gets too hot or too cold.


  • S-Line encrypted technology protects wireless signal
  • Freeze detection alerts you when temperature drops below 40° F
  • Heat detection alerts you when temperature exceeds 100° F
  • Great to detect HVAC failure
  • Helps protect elderly, infirm, and pets

Panel Compatibility

IQ Panel 2 319.5Mhz version IQ Panel 2+ 319.5Mhz version IQ Panel 4 319.5Mhz version

1 year warranty

Out of stock

SKU: QS5535-840 Categories: , , ,



Helps watch over those who need it most

You can’t be everywhere all the time. Use the IQ extreme temperature sensor to help ensure living conditions remain normal when you’re away.

Detect temperature extremes with Surety

If you’re going to use a security alarm, choose a professional grade sensor with secure wireless communication so you can be confident it will do it’s job.

Why should I use encrypted sensors?

The majority of security systems are not as secure as they could be. With technology advancing rapidly, it’s becoming more and more likely that someone who wants to compromise your security system can do so without much effort or expense.

IQ encrypted sensors send signals in a coded form that can only be understood by the alarm system they are connected to. This ensures that only your system can access the content of the message, keeping your sensor activity data safe and practically eliminating your system’s exposure to spoofing and replay attacks.

Don’t worry, this device integrates seamlessly

Surety is your connection to the award winning ecosystem, allowing you to use hundreds of best-in-class security and home automation devices from a single app that runs on almost anything. All that and the industry’s best customer service are why Surety is your home’s best friend.

Specs & Guides

Part Number
High Temperature Threshold
Low Temperature Threshold
Transmitter frequency
319.5 MHz
Wireless Protocol

Plan Compatibility

Security Alarm & Automation
Automate Alarm Home
Cameras Only
View Cam Cam Plus
Alarm, Automation & Cameras
Protect Complete


Who is notified when extreme temprature is detected?
For environmental alarms such as high/low temprature we notify the homeowner, not the police or fire department.

Still have questions? We’ve got answers!
The Surety support forum is the #1 resource for answers to all your questions about setting up and using the thermostat.
Find Answers

Additional information

Control Panel



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