Best Refrigerant Leak Detectors for Heat Pumps: 4 Picks
A comparison of four refrigerant leak detectors suited to heat pump work, with the sensor type, published sensitivity and refrigerant coverage of each.
Read Guide→Refrigerant Leak Detectors
Gas leak detectors, CO, methane, refrigerants and multi-gas meters.
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Buying Guides
Refrigerant Leak Detectors With Long Sensor Life: Three Picks and Two That Do Not Belong
Three refrigerant leak detectors with published long-life or field-replaceable sensors, compared on sensor type, refrigerant coverage and what the listings do not say.
Read Guide→Refrigerant Leak Detectors With Replaceable Sensors: Four Picks Compared
A comparison of refrigerant leak detectors with field-replaceable sensing elements, covering heated diode and infrared designs and what each listing actually publishes.
Read Guide→A3 Refrigerant Leak Detectors: 3 Compatible Tools Compared
A comparison of the A3-capable leak detectors in the listings, plus one accessory that keeps a heated diode detector working.
Read Guide→R32 Refrigerant Leak Detectors: Five Picks for A2L Work
A comparison of five refrigerant leak detectors sold for R32 and A2L service work, built from what each listing publishes.
Read Guide→Best R454B Refrigerant Leak Detectors: 5 A2L-Capable Picks
A comparison of five refrigerant leak detectors whose listings state A2L or R454B compatibility, with the sensor, sensitivity and probe facts each one actually publishes.
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How to Test a Refrigerant Leak Detector Before Use
A reference leak, a clean-air zero and a warm sensor. Two minutes that tell you the detector can find what you are looking for.
Read Guide→How to Choose a Refrigerant Leak Detector
Match the sensor to your refrigerants and workload: infrared for daily HVAC and A2L, heated diode for occasional HFC work, semiconductor for hydrocarbons.
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Best Refrigerant Leak Detectors for Automotive AC: R-134a and R-1234yf Picks
Sniffers for car and truck air conditioning compared on R-134a and R-1234yf sensitivity, UV dye lights, sweep mode, tracer-gas capability and sensor life.
Read Guide→Best Infrared Refrigerant Leak Detectors: Ten-Year Sensors for Daily HVAC Service
Infrared refrigerant sniffers with sensors rated in years, compared on stated sensitivity, sensitivity settings, A2L coverage, battery runtime and probe reach.
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Best Heated-Diode Refrigerant Leak Detectors: Sensitive Picks Where Sensor Life Is Managed
Heated-diode sniffers compared on stated sensitivity, sensor hours, refrigerant coverage and how easily the consumable sensor is replaced.
Read Guide→Best A2L Refrigerant Leak Detectors: Future-Ready Tools for Modern HVAC Work
Detectors whose listings name A2L coverage, sorted by sensor type: an infrared Fieldpiece, a replaceable-sensor all-rounder and a certified heated diode unit.
Read Guide→Product Reviews
INFICON D-TEK 3 Review: Is This Professional Refrigerant Detector Still a Smart Buy?
An infrared refrigerant leak detector with four sensitivity settings, automatic and manual zero modes, A2L coverage and a rugged carrying case.
Read Review→INFICON D-TEK Stratus Review: Premium Leak Detection or Overkill for Most HVAC Techs?
A portable infrared refrigerant leak detector that combines area monitoring with pinpoint leak location and shows concentration in ppm.
Read Review→Fieldpiece DR82 Review: Is Infrared Refrigerant Detection Really Worth the Extra Money?
An infrared refrigerant detector with a stated 10-year sensor, under 0.03 oz/yr, IP54, 17-inch probe and 10-plus hours on USB-C. Halogenated refrigerants only.
Read Review→Learning Center
Why Refrigerant Leak Detectors Miss Tiny Leaks and How Technicians Find Them
Detectors miss tiny leaks when the sweep is fast, sensitivity is wrong, air is moving, the sensor is tired or the zero is off. Slow and close finds them.
Read Article→R-32 and R-454B Leak Detection: Why Older Refrigerant Detectors May Not Be Enough
R-32 and R-454B are mildly flammable A2L refrigerants. An older detector may sense them, but unless its maker states A2L suitability it was not built for them.
Read Article→A2L Refrigerant Leak Detectors Explained: What HVAC Technicians Need to Change
An A2L refrigerant leak detector responds to R-32 and R-454B and is rated for use around a mildly flammable gas. Check the listing for the A2L label first.
Read Article→Refrigerant Leak Detector vs Combustible Gas Detector: Two Sniffers, Two Chemistries
Refrigerant detectors sense halogenated refrigerants; combustible gas detectors sense methane and propane. Only a dual-chemistry unit like the DRX3 does both.
Read Article→Fieldpiece DRX3 vs DR82: Which Leak Detector Makes More Sense for Modern Refrigerants?
The DRX3 covers A3, A2L and A1 refrigerants plus combustible gases on a replaceable heated-diode sensor. The DR82 is infrared with a stated 10-year sensor.
Read Article→Infrared vs Heated-Diode Refrigerant Leak Detectors
Heated diode: cheap, sensitive, short-lived, prone to false alarms. Infrared: selective, durable, A2L-ready, pricier.
Read Article→What Is a Refrigerant Leak Detector?
A sniffer for HFC, HFO, CO₂ and hydrocarbon refrigerants. The sensor type decides which it can find and how small.
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