When it comes to finding the best ac leak stoppers, there are a lot of options available on the market. But not all of them are created equal. Some products work better than others and some have more features to offer.

An AC leak is a problem that can happen in any type of air conditioning unit, whether it is a window unit, central air conditioning system or even a portable air conditioner.

An AC leak can cause problems with the compressor and the evaporator coils. If the leak is not fixed quickly, these problems will only get worse and will cost more to fix.

The following is a list of some of the best ac leak stoppers available on the market today, so that you can make an educated decision when shopping for one.

Best ac leak stoppers

IMAGE PRODUCT RATING
EDITOR’S CHOICE

Rectorseal 45316 AC Freeze PRO Nano Leak Sealer, Blue

Rectorseal 45316 AC Freeze PRO Nano Leak Sealer, Blue
9.7
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PREMIUM PICK

Leak Saver: Direct Inject UV - Refrigerant Leak Sealer with Added UV Dye to Detect Large Leaks - for AC, Refrigeration, and Automotive Systems Up to 5 Tons - Compatible with All Refrigerants

Leak Saver: Direct Inject UV – Refrigerant Leak Sealer with Added UV Dye to Detect Large Leaks – for AC, Refrigeration, and Automotive Systems Up to 5 Tons – Compatible with All Refrigerants
9.4
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PREMIUM CHOICE

Leak Saver: Direct Inject Ultimate 3-in-1 Leak Sealant with Moisture Remover and UV Dye for AC, Refrigeration, and Automotive Systems up to 5 Tons - Compatible with All Refrigerants - Made in The USA

Leak Saver: Direct Inject Ultimate 3-in-1 Leak Sealant with Moisture Remover and UV Dye for AC, Refrigeration, and Automotive Systems up to 5 Tons – Compatible with All Refrigerants – Made in The USA
9.2
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Leak Saver Direct Inject Refrigerant Leak Sealer - 2022 Updated Sealant Formula for Most HVAC Systems Up to 5 Tons - Made in the USA Leak Saver Direct Inject Refrigerant Leak Sealer – 2022 Updated Sealant Formula for Most HVAC Systems Up to 5 Tons – Made in the USA
8.7
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InterDynamics Certified AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, for Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, CERT325-6 InterDynamics Certified AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, for Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, CERT325-6
8.3
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Red Angel A/C Stop Leak & Conditioner InterDynamics Certified AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, for Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, CERT325-6
8.1
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Kidde Carbon Monoxide Detector, AC-Plug-In with Battery Backup, CO Alarm with Replacement Alert Kidde Carbon Monoxide Detector, AC-Plug-In with Battery Backup, CO Alarm with Replacement Alert
7.7
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TSI Supercool 28399 HVAC Leak Stop Syringe with Application Hose, 2 fl. oz. (60 mL) TSI Supercool 28399 HVAC Leak Stop Syringe with Application Hose, 2 fl. oz. (60 mL)
7.3
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Simbow Freon Leak Detector with LED Light, [2021 Upgrade] Refrigerant Halogen Leak Detector Portable R134a R410a R22a R600a R290 CFCs HCFCs HFCs Tester Air Conditioner Detection Tool HVAC Simbow Freon Leak Detector with LED Light, [2021 Upgrade] Refrigerant Halogen Leak Detector Portable R134a R410a R22a R600a R290 CFCs HCFCs HFCs Tester Air Conditioner Detection Tool HVAC
7.2
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Fix A Leak Pool Leak Sealer - 32 oz Fix A Leak Pool Leak Sealer – 32 oz
6.7
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Rectorseal 45316 AC Freeze PRO Nano Leak Sealer, Blue

EDITOR’S CHOICE

Specifications:

Rectorseal 45316 AC Freeze PRO Nano Leak Sealer, Blue

$55.36  in stock
4 new from $46.00
Free shipping
Amazon.com
as of June 29, 2022 7:38 pm

Features

  • Restore AC performance quickly
  • Stop refrigerant leaks permanently
  • Safe delivery tool
  • triple action sealant
  • Low loss safety fitting

Leak Saver: Direct Inject UV – Refrigerant Leak Sealer with Added UV Dye to Detect Large Leaks – for AC, Refrigeration, and Automotive Systems Up to 5 Tons – Compatible with All Refrigerants

PREMIUM PICK

Specifications:

Leak Saver: Direct Inject UV - Refrigerant Leak Sealer with Added UV Dye to Detect Large Leaks - for AC, Refrigeration, and Automotive Systems Up to 5 Tons - Compatible with All Refrigerants

$36.95  in stock
2 new from $36.95
Free shipping
Amazon.com
as of June 29, 2022 7:38 pm

Features

  • THE EASIEST INJECTION METHOD: No more fussing with messy syringes, hoses, or pressurized cans. The Leak Saver injects directly and easily into the system with a basic manifold gauge set or even easier with our Leak Shot Injection Kits. Note: for automotive systems, you will still need the standard 134A to 1/4” charging adapter. Mini-splits may require a 5/16” to 1/4” charging adapter.
  • MORE THAN 3 MILLION UNITS SOLD SINCE 2015: The Leak Saver can permanently seal small refrigerant leaks where the complete refrigerant charge is not lost within 72 hours. It’s similar to how blood in your body reacts to a cut. When a leak occurs, the Leak Saver reacts with the air and moisture at the leak site to permanently seal the leak. When used for preventative maintenance, the active ingredient circulates safely in the system to seal future leaks.
  • WITH ADDED UV DYE FOR FINDING LARGE LEAKS: Seal it or find it! If you have a leak that is simply too large for leak sealants to seal, the added UV Dye will light up brightly at the leak site when using a UV flashlight.
  • COMPATIBLE WITH ALL SYSTEMS AND REFRIGERANTS: : The Leak Saver UV is compatible with all systems, refrigerants (except ammonia), and oils. It is great for central air conditioners, car and automotive air conditioners, refrigerators, ductless mini-splits, heat pumps, geothermal heat pumps, commercial refrigeration systems, micro channel coils and more. It also works with all refrigerants including R410A Freon, R22 and replacements, R134A, R1234yf, R404A, R290, R600a, and more.
  • YOUR SATISFACTION IS OUR PRIORITY: We stand behind the effectiveness 100%. If for any reason you are not satisfied with your product, please contact us and we will make it right.

Leak Saver: Direct Inject Ultimate 3-in-1 Leak Sealant with Moisture Remover and UV Dye for AC, Refrigeration, and Automotive Systems up to 5 Tons – Compatible with All Refrigerants – Made in The USA

PREMIUM CHOICE

Specifications:

Leak Saver: Direct Inject Ultimate 3-in-1 Leak Sealant with Moisture Remover and UV Dye for AC, Refrigeration, and Automotive Systems up to 5 Tons - Compatible with All Refrigerants - Made in The USA

$46.95  in stock
2 new from $46.95
Free shipping
Amazon.com
as of June 29, 2022 7:38 pm

Features

  • THE EASIEST INJECTION METHOD: No more fussing with messy syringes, hoses, or pressurized cans. The Leak Saver injects directly and easily into the system with a basic manifold gauge set or even easier with our Leak Shot Injection Kits. Note: for automotive systems, you will still need the standard 134A to 1/4” charging adapter. Mini-splits may require a 5/16” to 1/4” charging adapter.
  • 3 in 1 SEALANT + MOISTURE REMOVER + UV DYE : Our proven leak sealant now includes moisture remover and UV dye for the complete system treatment! Now, you can seal your leak, remove system moisture, or find large leaks with the UV Dye...all in one easy to install package!
  • OVER THREE MILLION UNITS SOLD SINCE 2015: The Leak Saver can permanently seal small refrigerant leaks where the complete refrigerant charge is not lost within 72 hours. It works similarly to how blood in your body reacts to a cut. When a leak occurs, the Leak Saver reacts with the air and moisture at the leak site to permanently seal the leak. When used for preventative maintenance, the active ingredient circulates safely in the system to seal future leaks.
  • WORKS WITH ALL SYSTEMS AND REFRIGERANTS: Compatible with all systems, refrigerants (except ammonia), and oils. Useit on the following systems: central AC, mini split AC, cassette AC, car, refrigerated truck, home refrigerator, commercial refrigerator, boat, rv, ice machine, refrigeration racks, chillers, refrigeration condenser, cold rooms, and more. It also works with all refrigerants including R410A Freon, R22 and replacements, R134A, R1234yf, R404A, R290, R600a, and more.
  • YOUR SATISFACTION IS OUR PRIORITY: We stand behind the effectiveness 100%. If for any reason you are not satisfied with your product, please contact us and we will make it right.

Leak Saver Direct Inject Refrigerant Leak Sealer – 2022 Updated Sealant Formula for Most HVAC Systems Up to 5 Tons – Made in the USA

Specifications:

Leak Saver Direct Inject Refrigerant Leak Sealer - 2022 Updated Sealant Formula for Most HVAC Systems Up to 5 Tons - Made in the USA

$35.95  in stock
2 new from $35.95
Free shipping
Amazon.com
as of June 29, 2022 7:38 pm

Features

  • THE EASIEST INJECTION METHOD: No more fussing with messy syringes, hoses, or pressurized cans. The Leak Saver injects directly and easily into the system with a basic manifold gauge set or even easier with our Leak Shot Injection Kits. Note: for automotive systems, you will still need the standard 134A to 1/4” charging adapter. Mini-splits may require a 5/16” to 1/4” charging adapter.
  • A PERMANENT FIX FOR LEAKS: The Leak Saver can permanently seal small refrigerant leaks where the complete refrigerant charge is not lost within 72 hours. It’s similar to how blood in your body reacts to a cut. When a leak occurs, the Leak Saver reacts with the air and moisture at the leak site to permanently seal the leak. When used for preventative maintenance, the active ingredient circulates safely in the system to seal future leaks.
  • OVER THREE MILLION UNITS SOLD: With over 3 million units sold of this sealant formula since 2015, we are the most reliable leak sealant among HVAC professionals. Super concentrated and made to work with all types of refrigerants, it’s compatible with all types of refrigerants and oils (except ammonia).
  • MADE BY HVAC PROFESSIONALS: And used by them. Use Leak Saver on the following systems: central AC, mini split AC, cassette AC, car, refrigerated truck, home refrigerator, commercial refrigerator, boat, rv, ice machine, refrigeration racks, chillers, refrigeration condenser, cold rooms, and more.
  • YOUR SATISFACTION IS OUR PRIORITY: We’re so sure this will seal your next leak that if it doesn’t, contact us for another at no cost (must be installed by certified HVAC techs).

InterDynamics Certified AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, for Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, CERT325-6

Specifications:

InterDynamics Certified AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, for Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, CERT325-6

$32.97
$22.99
 in stock
2 new from $22.99
Free shipping
Amazon.com
as of June 29, 2022 7:38 pm

Features

  • Seals metal leaks in condensers, evaporators, accumulators, receiver and driers
  • Seals rubber leaks in hoses O-rings and gaskets
  • Comes with recharge hose
  • Safe for all R-134a systems
  • Professional grade

Red Angel A/C Stop Leak & Conditioner

Specifications:

Red Angel A/C Stop Leak & Conditioner

$40.61  in stock
3 new from $36.95
Amazon.com
as of June 29, 2022 7:38 pm

Features

  • Guaranteed Permanent Seal
  • Will Not Clog or Damage the A/C System or Recovery Unit
  • Compatible with R-134a

Kidde Carbon Monoxide Detector, AC-Plug-In with Battery Backup, CO Alarm with Replacement Alert

Specifications:

Kidde Carbon Monoxide Detector, AC-Plug-In with Battery Backup, CO Alarm with Replacement Alert

$29.99
$20.46
 in stock
12 new from $19.99
Free shipping
Amazon.com
as of June 29, 2022 7:38 pm

Features

  • CO detector that alerts with a warning signal against dangerous levels of carbon monoxide in your home
  • Easy & quick installation - plugs directly into your home's standard wall outlet, 85 decibel alarm alerts of fire
  • Protects during a power failure - 2-AA batteries, included with pack, provide backup service in the event of a power outage
  • Whole home family protection - place 1 carbon monoxide detector on each level of your home & in your bedroom to protect from poisonous gases
  • UL Certified, 10-year limited warranty

TSI Supercool 28399 HVAC Leak Stop Syringe with Application Hose, 2 fl. oz. (60 mL)

Specifications:

TSI Supercool 28399 HVAC Leak Stop Syringe with Application Hose, 2 fl. oz. (60 mL)

$24.67
$23.29
 in stock
Amazon.com
as of June 29, 2022 7:38 pm

Features

  • 2-Ounce Syringe Treats Up to 6 Ton Units
  • Permanently Seals Leaks in A/C and Refrigeration Systems
  • Does Not Contain Polymers, Will Not Harm A/C System Or Components
  • Additive Package Protects Against Future Corrosion
  • Compatible with All Lubricants and Refrigerants

Simbow Freon Leak Detector with LED Light, [2021 Upgrade] Refrigerant Halogen Leak Detector Portable R134a R410a R22a R600a R290 CFCs HCFCs HFCs Tester Air Conditioner Detection Tool HVAC

Specifications:

Simbow Freon Leak Detector with LED Light, [2021 Upgrade] Refrigerant Halogen Leak Detector Portable R134a R410a R22a R600a R290 CFCs HCFCs HFCs Tester Air Conditioner Detection Tool HVAC

$25.99  in stock
1 used from $24.74
Free shipping
Amazon.com
as of June 29, 2022 7:38 pm

Features

  • The Freon tester comes with UV lamp + flashlight. UV lamp is used with fluorescent agent, white light is suitable for illuminating dark and small places. 
  • 7 Adjustable Sensitivity; Maximum sensitivity is 0.21oz/yr. Response within 3 seconds; Warm up in 6 seconds.
  • Audible and visual gas leakage indicators and Dual-color visual display of battery voltage
  • Freon Leak Detector powered by 4*AAA Batteries(NOT included), Flashlight includes battery.
  • A flexible probe around 7.9-inch allows detections in difficult and hard-to-reach areas and triggers on R22, R134A, R404a, R410A and all halogenated refrigerants including HFCs, CFCs,HCFCs and blends.

Fix A Leak Pool Leak Sealer – 32 oz

Specifications:

Fix A Leak Pool Leak Sealer - 32 oz

$30.99
$24.11
 in stock
10 new from $24.11
Free shipping
Amazon.com
as of June 29, 2022 7:38 pm

Features

  • Finds and fixes leaks fast
  • Permanently seals leaks and holes up to 1/8 inch in diameter in most any material including plumbing
  • Spa Dosage: 8 oz. per 1,000 gallons, Pool Dosage: 1 qt. per 22,000 gallons