How to Choose the Right Infrared Contractor

In commercial and industrial facilities, infrared (IR) thermographic inspections are more than just a maintenance task. They're a critical component of electrical safety, asset integrity, and operational risk management. When selecting an IR contractor, the goal should always be to secure accuracy, reliability, and genuine expertise — not simply the lowest bid.

Below is an in-depth guide for facility managers, maintenance supervisors, and operations teams outlining why quality matters, what to prioritise, and the key questions to ask before hiring.

How to Choose the Right Infrared Thermography Contractor

In commercial and industrial facilities, infrared (IR) thermographic inspections are more than just a maintenance task. They're a critical component of electrical safety, asset integrity, and operational risk management. When selecting an IR contractor, the goal should always be to secure accuracy, reliability, and genuine expertise — not simply the lowest bid.

Below is an in-depth guide for facility managers, maintenance supervisors, and operations teams outlining why quality matters, what to prioritise, and the key questions to ask before hiring.

Why Quality Matters More Than Price

Cost pressures are real, but selecting the lowest-priced contractor exposes you to significant risks:

• Outdated or under-specified equipment that lacks the resolution or thermal sensitivity to detect critical faults. A camera with low resolution or high NETD (Noise Equivalent Temperature Difference) will miss issues that a professional-grade system would catch.

• Under-certified technicians who misinterpret thermal images, overlook key components, or produce incomplete reports — leaving you with a false sense of security.

• Inadequate reporting that omits load data, lacks clear thermograms, or fails to tie findings to actionable recommendations — making it difficult or impossible to remediate effectively.

In a high-stakes environment, these deficiencies can translate directly into latent equipment failure, unscheduled downtime, or a fire event — all of which cost far more than the difference paid upfront for a quality inspection.

The Contractor Selection Checklist

1. Level II Thermography Certification — Non-Negotiable

The single most important credential to verify is thermography certification level. There is a meaningful difference between a Level I and a Level II thermographer:

• A Level I thermographer is trained to operate equipment and capture images, but is limited in their ability to independently interpret and diagnose findings.

• A Level II thermographer is trained to analyse thermal patterns, understand the physics behind anomalies, and provide confident diagnoses. They are also qualified to review and endorse reports generated by Level I technicians.

  
  

For any commercial or industrial inspection, the report must be reviewed and certified by a Level II thermographer. Certifications should come from a recognised body such as the Infraspection Institute or ITC (Infrared Training Center). Don't hesitate to ask for the technician's certification number and verify it.

Beyond thermography credentials, look for contractors whose thermographers also hold trade qualifications — ideally a Journeyman Electrician certificate. A thermographer who understands electrical systems from the ground up will identify issues beyond what the thermal image alone reveals: wiring faults, connection degradation, protective device concerns, and code compliance issues that a camera operator without trade background would simply miss.

2. Camera Specifications — Know the Minimums

Not all thermal cameras are equal, and the equipment used directly determines what can and cannot be detected. When evaluating a contractor, ask for the make and model of the camera they will use and verify it meets these minimum thresholds:

Resolution: 640 x 480 pixels (minimum)

Camera resolution determines how much thermal detail is captured in a single image. A 640 x 480 camera produces approximately 307,000 measurement points per image. Lower-resolution cameras (such as 320 x 240 or 160 x 120) produce far fewer data points, meaning small or early-stage anomalies can be averaged out and missed entirely.

Some contractors use lower-resolution cameras to keep costs down — this is one of the most common and least visible ways corners get cut.

Thermal Sensitivity (NETD): Better than 40 mK (0.04°C)

NETD is the smallest temperature difference the camera can reliably detect. A camera with an NETD worse than 40 mK may fail to detect subtle early-stage faults — precisely the issues you want to catch before they escalate. Professional-grade cameras used for electrical inspections should have an NETD of 40 mK or better; many high-end units achieve 20 mK or less.

Additional features to ask about:

• IR-fusion / MSX image enhancement — overlays the thermal image with visible-light detail so anomalies can be precisely located on the physical equipment

• Annual calibration records — confirms the camera is maintained to manufacturer specifications and producing accurate temperature readings

• Radiometric JPEG output — stores full thermal data in each image file, enabling post-inspection reanalysis if needed

3. Inspection Methodology — Load Conditions Are Everything

An infrared scan performed on underloaded or idle equipment is largely worthless. Electrical faults, overloaded circuits, and failing connections reveal themselves through heat generated under load. If the equipment isn't running at or near normal operating capacity during the scan, the thermal signatures that indicate problems simply won't appear.

A qualified contractor will:

• Confirm the inspection will be conducted during normal operational load — ideally during a representative busy period

• Coordinate with your in-house electrical or maintenance team to ensure safe panel access and proper equipment operation during the scan

• Provide a clear scope of work in advance, specifying exactly what equipment will be inspected (switchgear, distribution panels, transformers, motors, VFDs, UPS systems, etc.) and what is excluded

Be cautious of any contractor who does not ask about your facility's operating schedule or does not discuss load conditions before booking.

4. Reporting Quality — The Deliverable Is the Product

The inspection itself is only half the work. The report is what your maintenance team acts on, what your insurer reviews, and what demonstrates due diligence if questions arise later.

A professional IR inspection report should include:

• Thermographer's name and certification level

• Both a thermal image and a visible-light photo of each flagged component, taken from the same angle

• Equipment identification — panel name, circuit number, physical location

• Load data — measured current, rated capacity, and load percentage at time of inspection

• Measured surface temperatures and delta-T (temperature differential) relative to comparable components

• Severity classification — a standardised rating (e.g., low/moderate/high/critical) based on temperature rise, not just absolute temperature

• Clear recommendations — specific corrective actions with prioritisation

Ask whether the contractor provides historical trending — comparing current findings against a baseline from a prior inspection — as this significantly increases the diagnostic value of repeat scans over time. Also confirm the report format is compatible with your facility management or asset tracking system.

5. Safety Program and Site Protocols

Working around energised electrical equipment carries real arc flash and shock hazards. A reputable contractor will have a documented safety program that includes:

• Arc flash PPE requirements appropriate to the voltage levels being inspected

• Clear lock-out/tag-out (LOTO) procedures for any de-energised work

• Site-specific hazard review prior to beginning the inspection

Ask to see their safety documentation. A contractor who can't produce it — or who dismisses the question — is one to walk away from.

Pro Tips for Facility Managers

• Schedule scans during peak load periods — when production lines, HVAC systems, and major equipment are all running — to maximise the detectability of thermal anomalies.

• Make IR inspections a recurring program, not a one-time exercise. Year-over-year trending dramatically increases the value of each inspection and supports long-range capital planning.

• Store all reports and images in your facility management system so findings are trackable, auditable, and available to insurance reviewers or regulators on request.

• Have a remediation plan ready — if a critical finding comes back, your maintenance team or electrical contractor should be able to act quickly. The IR scan is diagnostic; follow-through is what protects you.

• Review previous reports before hiring a new contractor. Were findings clear and actionable? Did they lead to actual repairs? Use that as a benchmark for your next provider.

The Bottom Line

Investing a little more upfront for a contractor with the right credentials, the right equipment, and the right methodology pays for itself many times over in prevented failures, avoided downtime, and defensible compliance documentation.

When evaluating proposals, push past the price and ask the hard questions: What camera are you using? What resolution? What is your thermographer's certification level? Will the inspection be performed under load? These aren't unreasonable questions — they're the questions a quality contractor will be happy to answer.tinuity, and risk reduction.