Best Air Conditioning Compressor Relays of 2026

Robert Reyes Avatar
Robert Reyes
Last Updated: Jan 10, 2026

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Air conditioning compressor relays are essential components that play a crucial role in the proper functioning of an air conditioning system. These relays are responsible for controlling the compressor's operation and ensuring that it starts and stops at the right time. They are designed to withstand high temperatures and high electrical loads, making them durable and reliable. Air conditioning compressor relays come in different types and sizes to fit various air conditioning systems. They are easy to install and maintain, making them a popular choice among HVAC technicians and homeowners who want to keep their air conditioning system running smoothly.

At a Glance: Our Top Picks

Viair 40 Amp Air Compressor Relay Cover #TOP 1
Viair 40 Amp Air Compressor Relay
ftb score rating icon 9.8
BestParts QP2-4.7 Refrigerator Starter Relay Cover #TOP 2
BestParts QP2-4.7 Refrigerator Starter Relay
ftb score rating icon 9.7
Casalytics Relay G8HL-H71 12VDC Automotive Set Cover #TOP 3
Casalytics Relay G8HL-H71 12VDC Automotive Set
ftb score rating icon 9.5

Top 10 Air Conditioning Compressor Relays

#TOP 1

Viair 40 Amp Air Compressor Relay

93940
Black
1 Count (Pack of 1)
Viair 40 Amp Air Compressor Relay Cover
Viair 93940 40 Amp Air Compressor Relay for 12 Volt compressor , Black

The Viair 40 Amp Air Compressor Relay is a must-have for proper installation of your 12 Volt compressor. With four 1/4 inch spade post connectors and a mounting tab for the relay, it can handle up to 40 amperes maximum ampere draw in applications. The moisture-resistant relay case ensures durability and longevity. Keep in mind that each compressor must have its own relay for proper installation.

What We Like
Durable and moisture-resistant relay case
Handles up to 40 amperes maximum ampere draw in applications
Includes four 1/4 inch spade post connectors
#TOP 2

BestParts QP2-4.7 Refrigerator Starter Relay

QP-02-4.7
BestParts QP2-4.7 Refrigerator Starter Relay Cover
BestParts QP2-4.7 Starter Relay, 4.7 Ohm, 3 Pin, Black, Automatic, Replacement Refrigerator Relay

The BestParts Starter Relay is designed to help keep your refrigerator running smoothly. It features a resistance of 4.7 Ohms, which helps control the electrical flow needed to start the compressor efficiently. With three pins, it easily connects to your appliance, ensuring a proper fit and reliable performance. Its compact size, measuring just over an inch in each dimension, allows for easy installation even in tight spaces. The black plastic material makes it lightweight and durable, so you can trust this relay to last. If you need a replacement part, the BestParts Starter Relay offers a simple and effective solution for your refrigerator.

What We Like
4.7 Ohm resistance
3-pin connection
Compact size
Durable plastic build
Lightweight design
#TOP 3

Casalytics Relay G8HL-H71 12VDC Automotive Set

CAG8HL-H71
Casalytics Relay G8HL-H71 12VDC Automotive Set Cover
Relay G8HL-H71 (Set of 2), 39794-SDA-A03 39794-SDA-A05 12VDC Automotive Relay - Compatible for 2003-2014 Accord 2006-2014 Civic 2007-2014 Acura MDX CR-V

The Casalytics G8HL-H71 Relay is a versatile automotive relay designed to power many vehicle accessories like A/C compressors, headlights, and horns. With its easy plug-in setup, you don’t need special tools or skills to install it, saving you time and effort. This relay is built to last, offering dependable performance even with regular use, so you can count on it to keep your vehicle’s systems running smoothly. It’s also compatible with many Honda models from 2003 to 2014, making it a convenient choice if you own one of these vehicles and need a reliable relay replacement.

What We Like
Wide compatibility
Simple plug-in installation
Durable and reliable
Supports multiple accessories
#TOP 4

WVE by NTK A/C Compressor Control Relay

1R1246
WVE by NTK A/C Compressor Control Relay Cover
WVE by NTK 1R1246 A/C Compressor Control Relay, 1 Pack

The WVE by NTK A/C Compressor Control Relay is a high-quality replacement part for your faulty air conditioning compressor relay. Designed to meet or exceed OE specifications, this relay carries high-amperage current controlled by a low-current switch. Without this replacement, your circuit will either be non-functional or remain engaged, resulting in a disrupted air conditioning system. With global coverage for import and/or domestic applications, this reliable relay is a must-have for any vehicle owner.

What We Like
Meets or exceeds OE specifications
Reliable replacement for faulty relays
Allows for proper functioning of air conditioning system
#TOP 5

GROBARPART 12V AC Relay

YK-JDQ-004
Black
GROBARPART 12V AC Relay Cover
90987-02027 2 pcs 4 pin 12V AC Relay Air Conditioning Relay Compatible with Toyota Avalon Corolla Camry Tundra Tacoma RAV4 4RUNNER Compatible with Lexus RX350 IS300 GX460 90080-87026 90987-02028

The GROBARPART AC Relay is a reliable solution for your air conditioning needs. This 4-pin relay serves as a direct replacement for various Toyota and Lexus models, ensuring compatibility with vehicles manufactured from 1996 to 2023. Made from high-quality materials, it withstands extreme temperatures, enhancing durability and long-term performance. You can trust that this relay has undergone strict quality testing before shipping, providing peace of mind with a one-year warranty for any issues that may arise. With this product, you can enjoy a smooth and efficient air conditioning operation in your vehicle.

What We Like
Compatible with many Toyota models
Durable high-quality materials
Strict quality testing
One-year warranty included
#TOP 6

uxcell Compressor Start Relay 1/3HP

a14101700ux0255
uxcell Compressor Start Relay 1/3HP Cover
uxcell 2Pcs Coil Compressor Relay Start Relay for 1/3HP Refrigerator Black

The uxcell Compressor Relay is designed specifically for 1/3HP refrigerators, making it an essential component for your appliance. Constructed from durable plastic and metal, this relay measures approximately 1.4 inches in all dimensions, ensuring a compact fit. It’s important to choose the right model based on your refrigerator's voltage; this relay is suitable for 220V with a 1/3HP compressor and for 110V with a 1/5HP compressor. With a package containing two relays, you’ll have a backup on hand, ensuring your refrigerator operates efficiently and without interruption.

What We Like
Durable materials
Compact size
Voltage compatibility
Includes two relays
#TOP 7

Casalytics Relay G8HL-H71 12VDC Automotive (Pack of 4)

G8HL-H71-NEW
Casalytics Relay G8HL-H71 12VDC Automotive (Pack of 4) Cover
Relay G8HL-H71 (Pack of 4), Automotive Relay 12VDC 39794-SDA-A03 39794-SDA-A05 - Compatible for 2003-2014 Accord 2006-2014 Civic 2007-2014 Acura MDX CR-V

The Casalytics G8HL-H71 Relay is a versatile automotive relay that helps you power important vehicle accessories like your A/C compressor, headlights, horn, and fans. Its easy plug-in design means you can install it quickly without needing special tools or technical skills, saving you time and hassle. Built to last, this relay offers dependable performance even with regular use, ensuring your accessories work smoothly. Plus, it fits a wide range of Honda models, making it a convenient and reliable choice if you own those vehicles. This relay gives you peace of mind with its durability and ease of use.

What We Like
Versatile compatibility
Simple plug-in installation
Reliable long-lasting performance
Fits many Honda models
#TOP 8

Casalytics 12193604 4-Pin 12V Relay Pack

CASA121936044P
Casalytics 12193604 4-Pin 12V Relay Pack Cover
Relay 12193604 3604 (Pack of 4), 4 Pin 12V Compatible with Chevy GMC GM Buick A/C Compressor Control Fuse Starter Relay

The Casalytics 12V Relay is a dependable replacement for various automotive parts, making it easy for you to find the right fit for your vehicle. It works with a 12-volt power supply and supports up to 30 amps, ensuring it can handle demanding electrical tasks. Its single pole double throw (SPDT) design lets you switch between two circuits smoothly, giving you more control over your car’s electrical system. Plus, it’s compatible with many Chevy and Pontiac models, so you can trust it to work well across different vehicles. This relay helps keep your air conditioning and other systems running reliably.

What We Like
Wide part compatibility
12V 30A power handling
SPDT contact design
Fits multiple Chevy models
#TOP 9

GLOB PRO SOLUTIONS CK213615000 Compressor Start Relay

CK213615000
GLOB PRO SOLUTIONS CK213615000 Compressor Start Relay Cover
GLOB PRO SOLUTIONS CK213615000 Fits Embraco Compressor Start Relay 213615000 3/16 Connector Compatible with Heavy Duty

The GLOB PRO Compressor Relay is designed to be a reliable replacement for Embraco compressors and several other models. Its new design ensures compatibility with multiple relay types, making it a versatile choice when you need a part that fits different units. Made from high-quality materials and following OEM standards, this relay guarantees durability and dependable performance. Whether you have an older or newer model, this relay supports both 50 and 60 hertz systems, giving you flexibility for various applications. Additionally, it works well with 110V or 120V systems commonly found in the USA and Canada, making it a convenient option for many users.

What We Like
Wide model compatibility
High-quality OEM material
Supports 50/60 hertz systems
Works with 110V/120V units
#TOP 10

TUAIC 61005518 Compressor Start Relay for Whirlpool and Maytag

61005518
TUAIC 61005518 Compressor Start Relay for Whirlpool and Maytag Cover
61005518 Compressor Start Relay for Whirlpool Maytag and Kenmore Refrigerators - Replaces 12002782, PS2004057, 61005518, AP4009659

The TUAIC Start Relay is designed to give your refrigerator's compressor a quick boost to get it running smoothly, then it shuts off to save energy. This helps your fridge start up efficiently without overworking the motor. It also includes an overload protector that guards against high current and overheating, keeping your compressor safe and extending its life. Made to fit popular brands like Whirlpool, Maytag, and Magic Chef, this relay replaces several common part numbers, making it easy for you to find the right fit. Plus, it's built with durable materials and tested for reliability, helping fix issues like your fridge not starting or running too warm.

What We Like
Compressor boost feature
Overload protection
Wide brand compatibility
Durable, high-quality material
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What happens when AC compressor relay goes bad?

When an AC compressor relay goes bad, it can weaken or intermittently supply power to the compressor, resulting in poor air conditioner performance. This can cause the system to work fine at times and stop working at other times.

2. How do I know if my HVAC relay is bad?

You may notice several signs indicating a bad HVAC relay. These include weak cooling, where the air conditioner doesn't produce enough cold air even on the highest setting. Intermittent cooling, odors, unusual noises, and higher electric bills are also potential indicators of a faulty relay.

3. Can a compressor run without relay?

No, a compressor cannot operate without a relay. The start relay is responsible for supplying energy to the compressor, allowing it to cycle on and off to maintain the ideal temperature inside the air conditioning unit.

4. How much does it cost to replace an AC relay?

The cost of replacing an AC relay can vary, but it typically ranges between $150 and $300. This repair is relatively simple compared to other HVAC repairs, making it a more affordable option.

5. How long do AC compressor relays last?

The lifespan of an AC compressor relay is measured in cycles rather than miles. Most relays are rated for about 50,000 cycles, which typically translates to around ten years of driving for the average user.

6. What causes an AC relay to fail?

AC relays can fail due to a variety of reasons. One common cause is worn-out electrical contacts from years of constant use. Overheating can also occur if too much electricity flows through the relay, often caused by issues with other AC components. It is not uncommon for a faulty part to cause a relay to burn out or melt its plastic housing.

Editor's Notes

During our air conditioning compressor relay research, we found 24 air conditioning compressor relay products and shortlisted 10 quality products. We collected and analyzed 7,906 customer reviews through our big data system to write the air conditioning compressor relays list. We found that most customers choose air conditioning compressor relays with an average price of $12.58.

The air conditioning compressor relays are available for purchase. We have researched hundreds of brands and picked the top brands of air conditioning compressor relays, including VIAIR, BestParts, Casalytics, WVE by NTK, GROBARPART. The seller of top 1 product has received honest feedback from 384 consumers with an average rating of 4.7.

Written by
Robert Reyes Avatar

Robert Reyes is a dedicated writer from San Francisco with a bachelor of degree in mechanics and a bachelor of degree in marketing. He focuses on making some complicated topics simple and enjoys explaining complex and technical things in an easy-to-understand way.