A thermal security camera sees heat instead of light, so it detects people, animals and vehicles in total darkness, fog, smoke and glare, and it is used for perimeter protection of large or remote sites; it cannot identify faces or read licence plates, so it is usually paired with a regular camera. Thermal suits fence lines, yards, lots and remote sites where lighting is poor and false alerts from shadows and insects are a problem. Because it detects heat contrast, it has a long detection range for a person but gives no readable detail. This page explains how thermal cameras work, where they beat regular cameras and where they do not.
PCBy the Pixl Canada install team. Updated October 26, 2026. 6 min read.
- Thermal vs regular camera table
- Best uses and poor fits
- Pairing thermal with a visible camera
- Free written quote for wired CCTV
- Thermal detects heat, so it works in darkness, fog and smoke.
- It cannot identify faces or read plates. Pair it with a visible camera.
- It is best for perimeters, yards and remote sites.
- It costs more than a regular camera, so use it where it solves a real problem.
How does a thermal camera compare with a regular camera?
| Factor | Thermal | Regular (visible light) |
|---|---|---|
| What it senses | Heat | Visible light and infrared glow |
| Darkness, fog, smoke | Works | Struggles; needs light or infrared |
| Detail | Shapes only, no faces or plates | Faces, clothing, plates |
| False alerts from shadows and insects | Few | More |
| Detection range for a person | Long | Depends on light and lens |
| Cost | Higher | Lower |
Where does thermal make sense?
| Situation | Fit |
|---|---|
| Large fenced yard or lot with no lighting | Good |
| Remote or industrial site. See remote site cameras | Good |
| Farm or long property line. See farm security cameras | Good |
| A front door where you need to see a face | Poor. Use a regular camera |
| Reading licence plates | Poor. See licence plate cameras |
| A small house or shop | Usually unnecessary |
How do you pair thermal with a regular camera?
A common design uses thermal cameras to detect people at long range and trigger alerts, then a PTZ or a visible camera to show what is happening and identify the person. See the PTZ camera guide and how far a camera can see. The recorder must support the thermal cameras. See the NVR buying guide.
Thermal security cameras: frequently asked questions
What is a thermal security camera?
A camera that detects heat rather than light, so it sees people and vehicles in darkness, fog and smoke.
Can a thermal camera identify a person?
No. It shows a heat shape. Use a regular camera to identify.
Do thermal cameras work in snow and fog?
They handle fog and darkness well. Heavy snow can still reduce range.
Are thermal cameras worth it?
For large perimeters and remote sites, often yes. For small properties, usually not.
Can Pixl install thermal cameras?
We can quote them for larger sites. Send photos and the site size. Wired CCTV gets a free written quote. You pay after the job.
Protect a large site without false alerts
Send photos and the site size. Free written quote. You pay after the job.
Sources and method. General description of thermal imaging for security. Range and detail depend on the sensor, lens and conditions. Check the datasheet.
About Pixl Canada. Pixl Canada is an installation company based in Edmonton, Alberta, serving cities across Canada with TV mounting, security cameras, appliance installation and smart home setup. Call or text (587) 899-7495. Open Monday to Saturday 8am to 8pm and Sunday 9am to 7pm.