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Top 10 Best HVAC Leak Detector Review [Powerful HVAC Leak Fixing Kits]

The HVAC tools appear in different categories with multi-functional features. Furthermore, these household and commercial accessories have changed our life dramatically; makes your daily task easier.

Probably, some of us haven’t proper idea what is the best HVAC leak detector?

The answer is quite straightforward as it sounds; the HVAC leak detector  helps to figure out where the leaks are located.

As we know, HVAC refers to Heating, Ventilation, and Air Conditioning; these devices make your environment relaxing when they are in good condition. Sadly, things break down, and so do HVACs.

Sometimes they leak refrigerant, called Freon. And too much of it in the air could be harmful to health.

Best Leak Detector for HVAC

Photo Title Buy
Elitech WJL-6000 HVAC...image Elitech WJL-6000 HVAC Leak Detector Halogen Gas Tester HVAC Refrigerant AC Sniffer R22 R410A R134A Buy On Amazon
LotFancy Freon Leak...image LotFancy Freon Leak Detector for Halogen Gas Leakage, Refrigerant HVAC Leak Detector for CFCs HCFCs HFCs R134a R1234yf R410a R22 R11 Tester, High Accuracy, with Indicator Light Buy On Amazon
Elitech CLD-100 Freon...image Elitech CLD-100 Freon Leak Detector Halogen Gas Leak Detector Car HVAC Refrigerant Leak Detector CFCs HCFCs HFCs Buy On Amazon

Experts have warned of the consequences of inhaling refrigerants. Gas released by HVAC into the atmosphere could cause coughing, trouble breathing, eye and skin irritation, nausea, and vomiting.

The 10 Best HVAC Leak Detector Reviews 2021

Before you get poisoned by Freon, you should detect it early with an HVAC leak detector. However, choosing a leak detector is not as easy as it sounds. Thus, this article will guide you to select the best.

In the reviews below, you will learn what makes the best leak detector. Such knowledge will help to make an informed decision when deciding on the best duct leakage detector.

01. Elitech WJL-6000 Detector

Highlighted Features & Details

Traditional Corona Sensor

Elitech WJL-6000, with a portable black bag, compact design, and longer battery life, can detect all halogenated gases, including all CFCs refrigerants.

There is no evading the laser target detection sensitivity of the leak detector, even for the HCFC gases. Other refrigerant blends, including AZ-50, the HP62 and MP30 gases, are easily detected without fail.

Arguably, Elitech traditional corona sensor is the best ac leak detector for technicians. And the choice for detecting leaks in HVACs with halogenated freons.

Short Preheating Time 

Technically, the traditional corona sensor duct leakage detectors offer one of the fastest takeoff points.

Once powered on, the switch will rotate, and it is ready to detect. All you need is a short preheating time of about 6 seconds to wait. Following the short warm-up is response time which takes just about 3 seconds.

Overall, you have a short time to wait to get the leak results. Expect results without any delay through light flash and audible buzzer alarm.

7 – Adjustable Sensitivity

Elitech WJL-6000 Sensitivity is remarkable with seven adjustable settings to vary detection capacity to prevent false reporting.

Such adjustable feature increases detection, response time, and reliability. You can adjust the sensitivity for an array of pressure and distinct gas behaviors.

Combining adjustable sensitivity with the flexible probe, detecting the hard-to-reach and difficult locations becomes a lot easier.


  • A quick start-up that only takes 6 seconds
  • Senses multiple gas leaks: halogenated gas and freons
  • Has fast response with 3-second detections
  • Has adjustable sensitivities
  • It has both audio and visual indicators
  • It has a long and flexible probe


  • The plastic materials not durable for industrial use

02. LotFancy Leak Detector

Highlighted Features & Details

Adjustable Sensitivity

With a simple calibration, the LotFancy detector can detect leaks other sensors may find challenging to detect.

When detecting in a hard-to-access location, the stainless steel probe makes testing easier. Whether hidden behind the refrigerator or inside the vents, LotFancy will locate the leak.

By using its active processing feature, it can pinpoint the exact leak spots. When in use, it produces faster and louder tones once it detects a high concentration of refrigerants. 

Flexible Nozzle

LotFancy has a 20cm long flexible stainless probe allowing it ample reach to measure leakages in challenging access areas.

Due to the stretchy nature of the probe, the device is ideal when testing HVAC used in residential houses. With the flexible stainless steel, LotFancy can adapt itself to any environment and can reach very delicate or tight areas to test and get results.

Real-Time detection

Any testing equipment that can give an instant result and allow you to continue working without delay is the best.

One reason you will find this best AC leak detector helpful is its ability to detect leaks in real-time. With the active adjustment method, it is possible to identify leaks quickly in whatever environment you are working.

Another plus to the real-time advantage is the calibration set. If you need to achieve more accurate results, you can reset and recalibrate to meet your need.

Wider Range Detection

A good criterion to measure the leak detector for HVAC is the range of chemicals it can detect.

Interestingly, LotFancy can detect a long list of freons categories such as HFC, CFC, and HCFC, etc. Not only that, chemical types, including series of R134a, R22, R404a, etc., are among the long list of freons LotFancy can detect.

If you are out for the best leak detector for HVAC, you will find LotFancy useful.


  • Works with most refrigerants
  • Decent sensor sensitivity rating
  • Stainless steel hose is flexible
  • Sturdy design, lightweight and portable
  • Excellently stable than most refrigerant leak detectors


  • Sensor life rating is a bit low

03. Elitech CLD-100 Detector

Highlighted Features & Details

Detect Halogenated Refrigerants

CLD-100 leak detector can detect all types of halogen gases.

Similarly, you can use the device to leaks in recovery containers and storage systems. As a halogenated chemical sensor, it reacts to relevant refrigerants such as chlorine and fluorine.

When you need a practical, economical, and easy-to-use testing device, Elitech CLD-100 will deliver.

6 Levels Adjustment Sensitivity

What determines a leak detector’s ability to detect leaks is the sensitivity.

With the feature, you can adjust and reset how the device senses a leak. Thus, CLD-100 has a 6-level sensitivity that you can adjust accordingly for an accurate result. It has a 6 g per year maximum sensitivity rating.

When the sensitivity adjustment feature combines with other cutting-edge technology, the result can be remarkable!

20 cm Stainless Steel Probe

With a flexible probe, CLD-100 can detect a leak in hard-to-reach areas.

Such flexibility and rustproof steel probe can get into places inaccessible for another leak sensor. Moreover, the probe makes it easy for the devices to get into tight areas to detect leaks.

Thus, your choice of duct leakage for HVAC should have this probe feature as good consideration.

Wide Detection Range

If you need the best ac leak detector covering a broader range of refrigerants, the CLD-100 will deliver beyond your expectations.

You will effectively cover CFCs (R12, etc.), HCFCs (R22, etc.), and HFCs with other blends, including AZ-50 gases.


  • Innovative turn dial sensitivity settings
  • Detects common refrigerant classes
  • Affordable and quality
  • Compliant with EN14624 & SAE 1627 technical standards


  • The length of the probe is only eight inches long

04. UEi Leak Detector

Highlighted Features & Details

Fast Response Time 

UEi offers a fast response time under 2 seconds, with up to a 4 percent accuracy level.

Once turned on, the UEI precision sensor will get to work to find a leak from know chemicals in the environment. Everything about the device is built for convenience; the flexible gooseneck probe can access any hard-to-reach area.

Fully Adjustable Steady

Featuring an adjustable tick rate, you can adjust the device to suit the intended need to respond to a predetermined detection level.

Adjusting the sensitivity level of the testing equipment can make it stable and deliver precision detection of refrigerants. Also, the chasing LED responds to differing rates of chemical concentration.

18 Inches Long Gooseneck

When it comes to detecting gases from hard-to-reach areas, UEi long gooseneck allows you to get a result.

With the long enough probe, getting into tight areas is easy to find the leak you want. The flexible probe sensor will help pinpoint the leak point with accuracy and do so consistently.

Wide Range Detection

UEi is a versatile leak detector useful for finding several combustible gases.

Among the gases, it can detect natural gas, methane, propane etc. Similarly, it can also sense leakages of jet fuel, benzene, and acetone, among others.

Apart from its simplicity, UEi is notable for being inexpensive yet versatile in detecting gases.


  • Detects most combustible gases
  • Professional quality tool
  • Adjustable sensitivity
  • Recovers very quickly


  • False positives detection

05. Inficon 705-202-G1 Detector

Highlighted Features & Details

Automatic background adjustment

Zeroing is a unique feature giving Inficon the ability to change its background to deliver precision leak detection assignments automatically.

As a technician, you have a tool that will adapt to the ideal situation through automatic calibration in the background.

Whether you are a heavy-duty or simple service technician, the Inficon leak sensor will serve your need always.

Flexible Rubber-Coated Metal Probe

Detecting offending refrigerants can be a task if your detector doesn’t have the proper probe.

Luckily, the manufacturer of Inficon had taken care of that need for you with a flexible rubber probe. While the probe can reach challenging areas, it is coated in metal material to make it durable.

The 15 inches flexible probe can be used in a tight area and detect leaks that hide away in corners.

Wide Range Detection

How many types of refrigerants your leak sensor can detect is an essential criterion for selection.

You need a sensitive and easy-to-use sensor that can detect the minutest trace of a leak, such as 0.25 oz/yr. Without a doubt, Inficon 705-202-G1 has the capacity to detect a wide variety of freons within the area being tested.

Thus, it will detect any type of freons, including CFCs, HCFCs, and HFCs’ blends.

Low battery indicator

While featuring 15 inches flexible probe to enhance leak detection, Inficon also features a Two D battery system.

Such a highly efficient power pack offers a more extended hour of service, approximately 16 hours of detection jobs. When working, you can monitor battery level through its advanced battery indicator.

Due to the durable nature of the battery, the visual indicator for reporting leaks and the alarm sound is often active.


  • Equipped with a long 15-inch probe to extend your reach
  • Durable leak sensitivity that doesn’t degrade with time 
  • A replaceable infrared sensor that lasts over 1,000 hours
  • Features automatic reset & manual zero settings


  • Super sensitive causing a few too many false alarms triggers

06. Simbow leak detector

Highlighted Features & Details

Halogen Leak Detector

Simbow uses an inner integrated circuit for ultra-low power consumption and can detect a wide range of halogen Freon.

Halogenated gas leak sensors use an air sampler like an automatic pump to determine the leak. Simbow detects all halogen Freons types comprising R11, R12, R500, R503, R22, R123, R124, R502, R125, R134a, etc.

By using an automotive sensor adjuster, Simbow can switch to the best sensitivity seamlessly.

Adjustable Sensitivity

Simbow uses its seven adjustable sensitivity feature to find the best working state to detect leaks automatically.

By using an automotive sensor adjuster, Simbow can switch to the best sensitivity seamlessly. Interestingly, the device’s inner IC makes it ultra-low in power consumption, thereby ensuring a longer battery life.

Fast Response 

Warming up time for this device is only about six seconds with a reset time of 2-10 seconds. Such fast response time allows the device to provide a real-time leak report for you to act.

Flexible Probe

Without a long enough and flexible probe, it is difficult for any detector to provide reliable support for sensing leaks.

With its 20cm flexible probe length, Simbow can find leaks almost instantly. Thus, the probe makes Simbow a choice, when looking for the HVAC duct leakage detector.


  • Ultra-low power consumption
  • Battery Dual-color visual display
  • High sensitivity 
  • Excellent sensor
  • Adjustable leak detector 
  • UV goggles for protection


  • None so serious

07. Yosoo Leak Detector

Highlighted Features & Details

High-Quality Sensor Technology

Yosoo refrigerant leak detector combines quality detection technology as an HVAC maintenance tool.

With its microprocessor control system using an advanced digital processing monitor, the device can detect leaks from various sources. Among the refrigerants, Yosoo best leak detector for HVAC will detect are R134a, R410a, and other blends of Freon gases.

Additionally, Yosoo can detect cleaning agents used in the hospital.

Low Power Consumption

An HVAC leak detector needs the power to operate. Thus, Yosoo uses low power consumption technology to keep the device working for a longer time.

Technically, its stability and durability are enhanced by design. Approximately, the 4AA battery can last for about 40 hours of regular operation.

Faster Response Time

Yosoo features an auto power-off that will switch off the device in ten minutes of idle time.

Once powered on, the warm-up time lasts about 90 seconds, and it takes much less time to report a leak when detected. Expectedly, the ability to respond in real-time is an essential feature of the best leak detector for HVAC.

It Avoids False Alarm

Yosoo WJL-6000 can ignore halogenated gases and concentrate on target refrigerants, thus preventing false alarms.

The ability to give a precision leak report makes Yosoo HVAC technicians delight. Additionally, the product fits the criteria for the best ac leak detector.


  • High-quality sensors can last up to a lifetime period
  • It is suitable for testing several halogen refrigerants
  • Combine ultra-low power design with high precision control and adjustable sensitivity
  • It ignores the presence of halogen gas for a precise report of the leak location


  • Difficult to detect small leaks with this tool

08. Inficon D-Tek Detector

Highlighted Features & Details

Wide Range Detection

Inficon D-Tek offers broader coverage for leak detection.

If you need the HVAC leak detector to detect Refrigerants and other blends, D-Tek will do it. Inficon goes a step further as a versatile sensor for CO2 using an optional carbon dioxide sensor.

D-Tek is designed for continuous detection as it provides up to 1000 hours of life. With this product, you can know the presence of Freon in the atmosphere using its optical sensor.

Such is the reliability of Inficon product that it features again in this list. Invariably, Inficon will detect CFC, HFCs, HCFCs, and blends of A2Ls.

Super sensitivity settings

Inficon offers different setting modes, including low, medium, and high, to provide reliable detection of refrigerants.

There is the supersensitivity adjustment that offers more reliable and precise leak detection. With this product, you can know the presence of Freon in the atmosphere using its optical sensor.

You will find it helpful in detecting small leaks other equipment will challenging to sense.

Manual & Automatic Zero Modes

D-Tek is a high-performance sensor to prevent contamination and works in manual zero and automatic modes. When you choose a leak sensor with a clear statement on the Freons, it senses, it’s better than gamble on products unknown.

Whether you are a homeowner, an HVAC technician, or work in automotive AC maintenance, you are good with Inficon.

Extra Long Probe

If you need a longer probe to check the hard-to-reach locations, get Inficon for its 17 inches probe.

No matter how sensitive or versatile a testing device is, without access to the location of the leak is a waste.


  • Detects all halogenated refrigerants
  • Infrared Sensor lasts more than a thousand hour
  • 0.10 Ounces per year sniffer sensitivity levels
  • Rechargeable battery with wall and car charger
  • Long time sensitivity


  • Very expensive

09. Themoteck WJL-6000 Detector

Highlighted Features & Details

Wide Range Detection

WJL-6000 can detect all halogenated refrigerants and also sense other blends of freons.

Among the refrigerants it detects are CFCs, HFCs, and HCFCs. Thus, if you need a sensor with broader coverage and application, research shows WJL-6000 covers a lot.

We figured this device’s sensitivity to refrigerants varies, and that is where the sensitivity feature comes in handy.

High Sensitivity Sensing

If a sensing device can’t sense the leak, it means it won’t detect it.

Therefore, Themoteck features 1-7 sensitivity grades to select the best sensing setting for the device. More interesting this is about the sensitivity adjustment is that it happens automatically.

Once sensitivity is in the proper position, detecting a leak is faster and much more straightforward.

Long Probe Length

Can there be detection without reaching the point to detect?

No! Since detection works where there is access, Themoteck features a longer probe measuring 20cm in length.

The fixed probe allows the device’s hand to reach the area to detect to acquire leak information. 

Fast Response

Themoteck is a Corona Sensor mobile device leak detector with a dual-color battery voltage display and sound alarm system.

This Themoteck warms up within 6 seconds and provides a fast response in the space of 3 seconds. Thus, it can detect and report a leak in real-time and get you working in no time.

Ideally, fast leak detection means you can increase the efficiency of your HVAC system and get things working find.

A corona sensor provides reliable leak detection and performance and, combined with faster response, makes your work a lot easier.


  • Detects all kinds of halogen refrigerants
  • Excellent sensor with longer battery life
  • Tri-color visual display of battery voltage
  • Automatic adjustment to the best state of detecting


  • Batteries not included

10. Testo 316-3 Detector

Highlighted Features & Details

Wider Refrigerants Detection

The more refrigerants a leak sensor can detect, the better for the user.

Testo does a good job finding more refrigerants and reveal the leak points. Quality-wise, you will find that this product adds essential features you need in good sensing equipment.

But, its ability to detect freons like CFCs, HCFCs, and HFC with other blends makes it another product to desire.

Simple One-button Operation

An easy to operate device is a technician’s delight, and Testo offers the most effortless operation possible.

All it requires is to load the battery and turn it on with a single button, and you are good to go. When simplicity is essential, and you want to get the work done as soon as possible, it pays to invest in a device that delivers.

Thus, working with Testo 316-3 refrigerant sensors can increase efficiency and give you the room to do more!

Automatic Sensitivity Adjustment

You can reduce the sensitivity to prevent false alarms because it would pick up any trace of leaks it found.

Testo is a premium quality, user-friendly heated diode patented sensor for residential and industrial applications. Technically, it offers up to 16 hours of continuous run time using D batteries.

Productivity features let you decrease sensitivity to locate leak sources. Such a feature helps to avoid refrigerant build-up allowing you to locate the tiniest leaks quickly.

Heated Diode Sensing Technology

Testo 316-3 best leak detector for HVAC uses Electrochemical Heated diode detector for sensing leak refrigerants.

In addition, Testo 316-3 can resist contaminants in its construction, including oil, dust, and dirt, to allow for optimal sensitivity.


  • Delivery is dependable with great value
  • Provides great sensitivity
  • Easy one-button operation
  • Extremely fast
  • Practical and user-friendly device


  • No concrete downside found

Buying consideration for the Best AC Leak Detector

There are numerous best HVAC tools and their reviews on Google. Having shared reviews for the best HVAC leak detector, you should consider the following items when selecting a product?

Build quality

We can’t stress the need for quality enough. Any leak detector that will deliver credible results must meet the quality design.

You should be concerned about the material used for constructing it. More importantly, the operation must be versatile tolerant to abuse.

If testing equipment is fragile, it means you can’t subject it to rigorous use.

The standard procedure for building stable and reliable equipment is to use state-of-the-art parts. Freon sensor will need to accommodate serial abuses in the course of use.

You should be concerned about the body, be mindful of other components, including the battery.

User-friendly design

You don’t need to get a tutor to use a device as simple as a leak detector.

If you need anything more than simple on and off and read the result, then forget it. Your business with an HVAC leak detector is to know the leak point.

For any reason, if you have to get an interpreter to understand the reading, it’s not recommended! More so, do make sure to buy a device with a manual to guide you in how it works.

Apart from changing the battery and switching on or off the power, any other ceremony is unacceptable.

Low maintenance

Do remember, the goal is to stop a leak and get your HVAC back to working condition.

Therefore the cost of maintenance of the device should be affordable. Avoid a gadget with complicated settings or one that frequently requires replacing batteries.

If it’s not reliable, stable, and accurate in its reading, forget it! Similarly, it isn’t worth the investment if it takes forever to learn how to use it.

You should set it up and start working in minutes. Avoid a duct leakage detector that brings confusion, extra expenses, and is costly to keep.

Type of detector

Check to know the detection method the device uses for sensing Freon.

Common types include ultrasonic, infrared, corona sensors, and heated diode. Of course, there are other detection methods, but endeavor to pick the ones listed here as the first choice.

Be careful to choose a detector with a high possibility of sensing your target refrigerant.

If the variation you are choosing can detector the kind of leak you are after, please choose! Remember that your success at stopping a leak will depend on being able to detect it.

Therefore, the detection method used and the device’s versatility go a long way to achieve your goal.


Lastly on our buying consideration is pricing. If you found a device with all criteria above, the decider is the price.

However, the price may not always determine quality. In most cases, price matters. Interestingly, you can get the price you target and find the grade you want.

Therefore, don’t be afraid to budget and look out for the price tag that meets your goal. Ideally, while quality, friendly design, low maintenance, and technology are essential, pricing should agree.

Overall, strike a balance among the criteria for the best leak detector, and you are a winner!

FAQ for the Best HVAC Leak Detector

1) What are some common types of leak detectors HVAC?

Some standard leak detectors include ultrasonic, infrared, heated electrolyte, corona sensor, and heated diode.

These are state-of-the-art sensors used by HVAC technicians to detect refrigerant leakages. With these leaks detectors, the technician can be alerted to the precise location for prompt fixing.

Other types of detectors include soap bubbles, fluorescent dye, and electronic sensors.

2) How can I locate a leak in my HVAC?

With the best leak detector, the sensor can locate the precise spot of leakage.

Ideally, the type of HVAC system being probe for leakage will determine the kind of leak detector to use. Some leak detection methods include underwater bubble tests, pressure and vacuum decay, and bubble soap paint.

When detecting gases such as halogen or helium, a gas tracer detector is used. 

3) Do refrigerant leak detectors work?

While some leak detectors can give a false alarm, most quality refrigerants sensors work perfectly.

Just like you have products that are underperforming, not all Freon leak detectors work. However, if you follow the buying guide above, you should not worry about buying a product that doesn’t work.

4) What could be the best ultrasonic leak sensor?

An ultrasound leak detector produces a hissing sound when it detects a leak and directs you to the source.

When choosing the best ultrasound sensor, however, pick one that meets the criteria discussed in the buying guide above.

Provided you bought quality and versatile testing equipment, you should be fine in terms of performance.

5) How do electronic leak detectors work?

An electronic leak sensor detects a leak by sensing the sounds produced from the source of leakage.

Thus, once the sound is heard, an expert technician can interpret the sound to know the leak’s location. With its transducer, the device can sense the pipe’s surrounding sound to determine a leak.

Some of the leaks electronic sensors can detect include ions of chlorine and fluorine, which often triggers the alarm.

6) What does a refrigerant leak detector do?

As the name suggests, a refrigerant leak detector helps to detect gas leakage in an HVAC system.

Thus, an HVAC leak sensor uses unique detection technology to locate leaking points not visible to humans. Technically, a refrigerant sensor comprises of sampling tube by which it detects air around the HVAC system.

7) How to use an HVAC leak detector?

You will come across different types of refrigerant leak detectors, and each one has a unique way they work.

For instance, a heated diode detector works by breaking down the molecules to detect positively charged ions of either chlorine or fluorine.

When these ions are found, the heated diode detector emits sound and visual alerts to indicate a leak.

8) Why is HVAC leaking?

An HVAC system needs to be in optimal working condition, especially the airflow passage surrounding the evaporator.

If the evaporator coil area is clogged and prevents airflow, the system quickly freezes, causing the refrigerant to drip water. Since the cooling gas passes through the evaporator coil, it needs sufficient airflow for heat absorption.

However, continued restriction of air to the evaporator due to blockage can cause HVAC to leak.

9) Should my HVAC be leaking water?

Sometimes, it is normal for the HVAC to leak water if the unit area is free and unclogged.

However, it is abnormal if you notice a blockage in the evaporator unit. Therefore, regular maintenance of the filter to clear the dirt and enhance airflow is recommended to prevent abnormal leakage.

10) What does it cost to fix a leak in HVAC?

Your HVAC system uses refrigerant to cool warm air and your home cool and cozy.

In case of a leak, the technician will check the level of damage and suggest a remedy. After the broken part is remedied, there is a need to replace the Freon to get the HVAC cooling again.

Thus, it’s hard to say precisely how much it cost to fix. However, your HVAC serviceman will determine the cost or request a free quote from a trusted technician.

Wrap it Up

Before you can determine the point of a leak, you need the best HVAC leak detector.

Freon sensors come in different shades and qualities, and the responsibility is yours to find the best. While you can go with any of the products reviewed in this article, feel free to explore others in the market.

As easy as it may look, detecting a leak in your HAVC unit is not guesswork. More importantly, an unattended HVAC leak can cause unexpected consequences.

Therefore, you should go for the best testing device and always go for quality! Since you have read this far, we believe you will make the best decision when buying an HVAC leak detector for your need.

No matter what, never leave a leaky HVAC unattended because of the problems it may cause.

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