15 Best AC Stop Leak Products to Seal Your System

Discover the best AC stop leak solutions to keep your cooling system running smoothly. Find quick fixes for lasting comfort in your home.
15 Best AC Stop Leak Products to Seal Your System

Top Quick Picks For You

Best Bang for Your Buck

BlueDevil A/C Stop Leak

BlueDevil A/C Stop Leak

The BlueDevil Products Red Angel AC Stop Leak offers a great balance of performance and affordability, making it the best choice for those looking for value.

Best for Permanent Sealing

Leak Saver

Leak Saver

The Leak Saver Direct Inject AC Leak Sealer is designed to permanently seal refrigerant leaks and has a proven track record of effectiveness among HVAC professionals.

Best for DIY Homeowners

InterDynamics

InterDynamics

The InterDynamics Car Air Conditioner, Certified A/C Pro Refrigerant Leak Stop Kit, is user-friendly and provides all necessary components for quick DIY fixes.

Best for Quick Fixes

InterDynamics A/C Pro

InterDynamics A/C Pro

The A/C Pro Super Seal AC Stop Leak Kit comes with everything needed for immediate application, making it ideal for quick and effective repairs.

Best Ac Stop Leak

As the sweltering heat of summer approaches, ensuring your air conditioning system runs smoothly becomes a top priority. If your cooling unit is leaking refrigerant, fear not—there's a world of stop leak solutions designed to save the day. In this guide, we’ll explore the best AC stop leak products that promise to provide a quick fix, keeping your home comfortably cool without the need for costly repairs.

Best Bang for Your Buck: BlueDevil A/C Stop Leak

BlueDevil Products Red Angel 49496 A/C Stop Leak - 2 Ounce
GoodNot So Good
Repairs various leaksTemporary fix
Permanent sealMay damage sensors
Non-clogging formulaNot universally effective

When it comes to sealing leaks, the BlueDevil Products Red Angel AC Stop Leak truly stands out as our Best Bang for Your Buck choice .

With its remarkable ability to repair and seal leaks in condensers, evaporators, and more, it’s a go-to solution for those who want effective results without breaking the bank .

What we love most ?

Its non-clogging formula, which means you won't have to worry about harming your system .

Plus, it forms a permanent seal—goodbye, leaks !

While it may not be universally effective, and there’s a slight chance it may affect sensors, the value you get is hard to beat .

If you need a reliable fix, this product is worth considering!

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Price history for BlueDevil A/C Stop Leak on Amazon

Best for Permanent Sealing: Leak Saver

Leak Saver Direct Inject AC Leak Sealer | AC Stop Leak for Most HVAC Systems Up to 5 Tons | Works with All Systems & AC Refrigerants | Made in The USA
GoodNot So Good
Permanently seals leaksAdapter may be required
Compatible with all systemsNot suitable for ammonia
Straightforward installationVariable effectiveness over time

When it comes to sealing AC leaks, we proudly present the Leak Saver Direct Inject AC Leak Sealer as our top pick for permanent sealing .

This innovative solution permanently seals refrigerant leaks within just a week, making it a lifesaver for both home and car systems .

Not only is it compatible with various refrigerants (aside from ammonia), but it also boasts a straightforward installation process .

No more messing with complicated tools !

We love that it’s safe for all HVAC components, and with over 4 million units sold, it’s clearly trusted by professionals .

Get ready to keep your AC running smoothly!

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Price history for Leak Saver on Amazon

Best for DIY Homeowners: InterDynamics

InterDynamics Car Air Conditioner, Certified A/C Pro Refrigerant Leak Stop Kit for R134A Car Air Conditioners, 3 Oz Each
GoodNot So Good
Effective short-term solutionContaminates system long-term
Repairs various leak typesCan expire if old stock
Easy to use hose includedPrice may increase over time

When it comes to tackling A/C leaks, the InterDynamics Car Air Conditioner, Certified A/C Pro Refrigerant Leak Stop Kit earns our top pick for DIY homeowners .

With its user-friendly design and comprehensive components, we found it incredibly straightforward to use .

Each kit includes 1.5oz of refrigerant alongside additives specifically formulated to tackle both metal and rubber leaks in evaporators, condensers, and more .

The reusable dispensing hose is a thoughtful touch that ensures compliance with R-134a cans .

However, keep in mind that while it’s an effective short-term fix, it may contaminate systems in the long run .

Ultimately, it’s an intelligent choice for quick repairs!

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Price history for InterDynamics on Amazon

Best for Quick Fixes: InterDynamics A/C Pro

A/C Pro Super Seal AC Stop Leak Kit with Dispensing Hose - 3 OZ
GoodNot So Good
Easy to useCannot ship to CA/Washington
Effective leak sealingMay require multiple applications
Includes reusable hoseMessy installation process

When it comes to quick fixes, we found the A/C Pro Super Seal AC Stop Leak Kit to be a game-changer .

This all-in-one solution includes a 3 oz can with a handy dispensing hose, making it super straightforward to tackle leaks in your car’s air conditioning system .

Its highly effective formulation not only seals current leaks but also helps prevent future issues .

While the installation process might be a bit messy and shipping is limited to certain states, the results speak for themselves .

With strong customer reviews praising its ease of use, we're confident this kit is a worthy addition to your car maintenance arsenal!

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Price history for InterDynamics A/C Pro on Amazon

BlueDevil A/C Stop Leak

Red Angel 00222 A/C Stop Leak & Conditioner - 4.5 Ounce
GoodNot So Good
Guaranteed permanent sealInconsistent results
UV dye for leak detectionComplicated instructions
No clogging or damageCan leakage issues

When we stumbled upon the BlueDevil Products AC Stop Leak, we were intrigued by its promises of a guaranteed permanent seal .

This nifty 4.5-ounce solution not only seals leaks but also comes equipped with UV dye for easy detection of any pesky problem areas .

We appreciate that it won’t clog or damage your A/C system, making it a friendlier option for your HVAC unit .

However, we’ve noticed mixed results from users and some find the instructions a tad complicated .

Despite this, if you're in need of a quick fix, this product might just seal the deal!

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Price history for BlueDevil A/C Stop Leak on Amazon

ComStar A/C Zero-Leak

ComStar A/C Zero-Leak, Permanent "Stop Leak" for A/C Systems, Seals Leaks Instantly, Non-Hardening, Polymer-Free, Eco-Friendly, Made in USA, 4 Ounces (90-700)
GoodNot So Good
Effective for minor leaksVariable effectiveness
Environmentally safeRequires multiple applications
Non-harmful to A/C systemsNot universally effective

When it comes to tackling minor leaks in your A/C system, we're impressed with the effectiveness of this stop leak solution .

Specifically developed for evaporators, condensers, gaskets, and seals, it fits seamlessly into both automotive and residential applications .

The environmentally safe formula gives us peace of mind, while its non-hardening, polymer-free properties mean you won't be damaging your system over time .

While some users might find variable results, we've seen it provide solid performance with preventive maintenance .

Just remember, you might need multiple applications for stubborn leaks .

Overall, a worthy addition to your A/C toolkit!

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Price history for ComStar A/C Zero-Leak on Amazon

Leak Saver Ac Stop Leak

Leak Saver Direct Inject Ultimate 3-in-1 | AC Refrigerant Leak Sealer | with UV Dye & Moisture Remover | for Most HVAC Systems Up to 5 Tons - Professional AC Leak Sealer - AC Stop Leak
GoodNot So Good
Easy to installMay not work for all
Works with all systemsRequires specific adapters
Permanent sealMixed results reported

Looking for a robust solution to AC leaks ?

Look no further than the Leak Saver !

This 3-in-1 wonder packs a powerful punch with its sealant, moisture remover, and handy UV dye—all in a straightforward installation .

We love how easy it is to use, even for those of us who aren't HVAC experts .

Its ability to permanently seal leaks is a game changer, providing peace of mind for both home and automotive systems .

Keep in mind, though, that you'll need specific adapters for certain setups .

With over 4 million units sold, this product is definitely a favorite among professionals!

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Price history for Leak Saver on Amazon

TSI Supercool 28399

TSI Supercool 28399 HVAC Leak Stop Syringe with Application Hose, 2 fl. oz. (60 mL)
GoodNot So Good
Easy to injectDifficult to use syringe
Permanently seals leaksInstructions aren't clear
Compatible with all lubricantsMay require additional tools

When it comes to sealing A/C leaks, TSI Supercool’s AC Stop Leak is a noteworthy contender in our lineup .

With just a 2-ounce syringe, it tackles leaks in systems up to 6 tons. What we love? Its ability to permanently seal leaks without harming your A/C components means peace of mind for you and your system .

Plus, it’s compatible with all lubricants and refrigerants, which is a definite plus .

However, we found the syringe a bit tricky to handle, and the instructions could use some clarity .

Despite these minor hiccups, this product is an effective solution worth considering.

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Price history for TSI Supercool 28399 on Amazon

Supercool

Aerosol A/C Leak Stop Seals, 4 Oz
GoodNot So Good
Effective leak detectionCan is underfilled
Good for quick fixesModerate customer ratings
Compact sizeLimited application range

When it comes to sealing A/C leaks quickly, we found the Supercool Aerosol A/C Leak Stop to be a handy little tool .

Compact in size and easy to use, it’s perfect for on-the-go fixes .

We appreciate its effectiveness in leak detection, making it ideal for those unexpected situations .

However, be mindful that the can may be slightly underfilled, which could lead to disappointment for some .

While it has a moderate customer rating, it still ranks decently among air conditioning repair tools .

Overall, if you're in a pinch, this product can get the job done without hassle!

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Price history for Supercool on Amazon

Leak Saver Ac Stop Leak

Leak Saver Direct Inject Small System with UV Dye - Refrigerant Leak Sealer - Detects Large Leaks - Ideal for Most Small Home Appliances and HVAC Systems up to 1 Ton - Proudly Made in The USA
GoodNot So Good
Easy injection methodMay clog high-pressure systems
Effective on small leaksSome reports of failure
Compatible with all systemsRequires additional adapters

The Leak Saver has truly revolutionized how we tackle refrigerant leaks .

With its easy injection method, you can forget about messy syringes and hoses—just connect it with a basic manifold gauge set or our Leak Shot Injection Kits .

With over 3 million units sold, it effectively seals small leaks in under 72 hours, almost like magic !

Plus, the added UV dye helps us pinpoint larger leaks with ease .

It’s compatible with a wide array of systems and refrigerants, making it a versatile tool in our home maintenance arsenal .

Just remember, while it’s a powerhouse for small leaks, it may not be perfect for high-pressure systems .

Overall, we’re impressed!

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Price history for Leak Saver on Amazon

Rectorseal

Rectorseal 45316 AC Freeze PRO Nano Leak Sealer, 1.5 oz, Blue
GoodNot So Good
Easy to applyMixed effectiveness
Seals small leaksRequires professional install
OEM approvedLimited quantity per unit

When it comes to sealing up pesky refrigerant leaks, AC Leak Freeze PRO by RectorSeal stands out with its innovative nano technology .

With just a simple application, you can restore your AC’s performance without breaking a sweat .

The dual sealant works wonders by filling those hard-to-find cracks, making it a game-changer for both homeowners and professionals alike .

While some users report mixed effectiveness, its OEM approval adds a layer of credibility, ensuring it's safe for your HVAC systems .

Just remember, professional installation is recommended to get the best results .

With 1.5 oz of liquid power, it’s compact and convenient for tackling those unexpected leaks head-on!

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Price history for Rectorseal on Amazon

Rectorseal AC Leak Freeze

RectorSeal AC Leak Freeze Magic Frost with 1/4" Adapter 45322 Leak Sealant, Non- Polymer Formula & Safe for Refrigeration Systems, Easy Application, HVAC, 0.5 oz.
GoodNot So Good
Easy to applyMessy application
Stops leaks permanentlyDifficult to control
Safe for HVAC systemsLimited effectiveness on severe leaks

When it comes to tackling pesky refrigerant leaks, AC Leak Freeze by RectorSeal is a contender that caught our attention. With its single-use syringe, this product is designed for easy and safe application in both residential and commercial A/C systems .

We appreciate how it stops leaks permanently, revitalizing your unit and ensuring it runs smoothly again .

However, do keep in mind that the application can be a tad messy and may not be effective for severe leaks .

Overall, if you're facing minor issues, this product could be your quick fix!

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Price history for Rectorseal AC Leak Freeze on Amazon

Enviro-Safe ProSeal Ac Stop Leak

ENVIRO-SAFE ProSeal XL4 Inject Stop Leak R-22 (1.5-5 Ton Units) for Home AC #2100AI-5
GoodNot So Good
Easy installationMay not last long
Effective for small leaksDifficult in tight spaces
Responsive customer servicePotential for large leaks

When it comes to tackling small AC leaks, we find the ENVIRO-SAFE #2100AI-5 to be a solid choice .

With its easy installation and effective performance, it shines in ensuring your home stays cool without breaking the bank .

Although it struggles a bit in tight spaces and may not handle larger leaks, it's highly effective for minor issues .

Plus, their responsive customer service is a definite bonus if you have questions along the way .

With an average rating of 4.2 stars from 131 reviews, it's clear that many users have enjoyed this handy tool. Stay cool and leak-free!

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Price history for Enviro-Safe ProSeal on Amazon

Rectorseal AC Leak Freeze

Rectorseal 45312 AC Leak Freeze 1.5oz Cartridge, 1.5 oz
GoodNot So Good
Permanently seals leaksRequires professional knowledge
Non-clogging formulaTime to evaluate effectiveness
OEM approvedNot suitable for all users

When it comes to tackling stubborn AC leaks, RectorSeal's AC Leak Freeze is a real game changer .

This little blue bottle doesn’t just seal leaks; it’s designed to permanently seal leaks in your air conditioning and refrigeration systems .

With a formula that’s both OEM approved and non-clogging, you can trust that your compressor will remain safe and sound .

However, keep in mind that achieving the best results may require some professional know-how and patience to evaluate its effectiveness .

Overall, if you're seeking a reliable solution to keep your AC running smoothly, we've found a worthy contender!

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Price history for Rectorseal AC Leak Freeze on Amazon

Nu-Calgon EasySeal

Nu-Calgon 4050-11 EasySeal Direct Inject-UV Dye Refrigerant Leak Sealant, One Size Treats Systems 2 to 7.5 Tons
GoodNot So Good
Concentrated formulaOne-time use only
Clear visibilityMay not seal large leaks
No pumping for R-410AMixed results reported

When it comes to tackling pesky leaks in your AC system, Nu-Calgon’s AC Stop Leak is a standout choice !

Its concentrated formula ensures that you’re using less material while achieving impressive results .

We love the clear tube, which allows us to see the sealant as it flows into the system—great for those who appreciate clarity in the repair process .

Plus, there’s no need for a cumbersome pump with R-410A units, making it a breeze for your split systems and mini splits .

Just keep in mind it's a one-time use product, so make sure to address smaller leaks for optimal sealing .

Overall, it’s a handy tool in our home improvement arsenal!

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Price history for Nu-Calgon EasySeal on Amazon

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