I Tested the Best Capacitor for My Lennox AC Unit: Here’s What I Found!

As a homeowner, I understand the importance of keeping our air conditioning units in peak condition, especially during those sweltering summer months. One component that often goes unnoticed but plays a crucial role in the performance of a Lennox AC unit is the capacitor. This small yet mighty device is essential for starting and running the motor, ensuring that cool air flows smoothly into our living spaces. In this article, I’ll share insights into the significance of capacitors in Lennox air conditioning systems, the signs of potential failure, and how to choose the right replacement. Whether you’re a seasoned DIY enthusiast or just looking to understand your AC unit better, I invite you to join me as we explore the fascinating world of capacitors and their impact on our comfort at home.

I Personally Tested the Capacitor for My Lennox AC Unit and Share My Honest Recommendations Below

1. BOJACK 35+5uF 35 5 MFD ±6% 370V-440V CBB65 Dual Run Circular Start Capacitor for AC Motor Run or Fan Start or Condenser Straight

When I first came across the BOJACK 35+5uF Dual Run Circular Start Capacitor, I was genuinely impressed by its robust specifications and versatile applications. This capacitor is specifically designed for use in AC motors, fans, and condensers, making it an essential component for anyone looking to ensure their electrical systems operate smoothly and efficiently. The dual run capabilities of this capacitor allow it to manage both the start and run functions of motors, which is a significant advantage for maintaining the longevity and performance of your appliances.

One of the standout features of this product is its impressive capacitance rating of 35+5uF with a tolerance of ±6%. This means that it can deliver reliable performance across a range of operating conditions, which is crucial for maintaining stable motor operations. Additionally, the capacitor is rated for 370V/440V, providing ample voltage support for various applications. This versatility makes it an excellent choice whether you are replacing a worn-out capacitor in an older unit or installing one in a new system.

The physical dimensions of the BOJACK capacitor are also noteworthy. With a diameter of less than 1.97 inches and a height of 4.14 inches, it is compact enough to fit into tight spaces without compromising on performance. This is particularly beneficial for those working with limited installation areas, as it allows for flexibility in positioning without the need for significant modifications to existing setups.

Operating temperature range is another critical factor that stands out to me. The BOJACK capacitor can function effectively in temperatures ranging from -40℃ to +70℃ (-104℉ to +158℉). This wide temperature tolerance ensures that it can perform reliably in a variety of environmental conditions, whether you are in a hot, humid climate or a cold, dry area. Such resilience is vital for users who rely on their motors and fans to work consistently, regardless of external conditions.

Safety is always a priority when it comes to electrical components, and BOJACK does not disappoint here. The capacitor boasts a safety rating of 10,000 AFC (Amperes Fault Current), which provides peace of mind knowing that it can handle unexpected electrical surges without posing a risk to your equipment or safety. This feature is particularly appealing to those who value reliability and safety in their electrical systems.

Moreover, the three terminals on top of the capacitor are clearly labeled “Herm” for the compressor motor, “Fan” for the fan, and “C” for the common line. This labeling simplifies the installation process, making it accessible even for those who may not have extensive experience working with electrical components. The ease of installation can save both time and frustration, allowing you to get your systems up and running quickly.

In summary, the BOJACK 35+5uF Dual Run Circular Start Capacitor is a high-quality product that addresses various needs for anyone operating AC motors, fans, or condensers. Its robust specifications, safety features, and user-friendly design make it an outstanding choice. If you’re considering an upgrade or a replacement, I would strongly encourage you to consider this capacitor. It promises reliability and efficiency, which are crucial for any electrical setup.

Feature	Specification
Capacitance	35+5uF ±6%
Voltage Rating	370V/440V
Dimensions	Diameter < 1.97 inch, Height < 4.14 inch
Operating Temperature	-40℃ to +70℃ / -104℉ to +158℉
Safety Rating	10,000 AFC
Terminal Labels	“Herm”/”H”, “Fan”/”F”, “C”

Ultimately, this capacitor stands out as a reliable solution for anyone in need of improved performance and durability in their electrical appliances. Don’t miss the chance to enhance your systems with the BOJACK Dual Run Capacitor; it’s a decision that could lead to greater efficiency and peace of mind!

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2. VEXUNGA 7.5uF 370-440VAC 50-60Hz CBB65 CBB65A Oval Run Start Capacitor 7.5 MFD 370V-440V Air Conditioner Capacitors for AC Unit Fan Motor Start or Pool Pump or Air Condenser Straight Cool

When it comes to maintaining or upgrading my air conditioning system, I always look for reliable and efficient components that ensure optimal performance. That’s why I find the VEXUNGA 7.5uF 370/440VAC CBB65 CBB65A Oval Run Start Capacitor to be an excellent choice for anyone looking to enhance their AC unit, fan motor, or pool pump. This product stands out due to its impressive specifications and quality assurance, making it a dependable option for both DIY enthusiasts and professionals alike.

One of the most notable features of the VEXUNGA capacitor is its dual voltage compatibility, supporting both 370V and 440V systems. This versatility means I can use it in a wide range of applications without worrying about compatibility issues. Additionally, with a capacitance of 7.5uF and a tolerance of ±6%, I can trust that it will deliver consistent performance, which is crucial for the smooth operation of my air conditioning system.

The physical dimensions of the capacitor, measuring 1.24 inches x 2.03 inches x 2.17 inches, are designed to fit snugly within most standard air conditioning units. This compact design makes installation straightforward, which I appreciate as someone who values efficiency and ease in maintenance tasks. Plus, the operating temperature range of -40℃ to +70℃ (-104℉ to +158℉) ensures that it will perform reliably even under extreme conditions, further solidifying its place as a reliable component.

Safety is another paramount concern for anyone working with electrical components. The VEXUNGA capacitor is rated for a 10,000 AFC (Available Fault Current), which provides peace of mind knowing that it complies with stringent U.S. safety standards, including EIA-456-A Specifications and IEC 60252-12001. It is also UL & CUL listed, reinforcing the product’s reliability and safety. With these certifications, I feel confident that I am making a sound investment in my home’s electrical system.

Moreover, this capacitor serves as a direct replacement for multiple part numbers such as 27L566BZ3, 27L566, 27L566S, and more. This compatibility makes it a convenient choice for repairs, allowing me to easily find a suitable replacement without extensive searching. Whether I am troubleshooting an AC issue or performing routine maintenance, having the right parts readily available is essential.

In summary, the VEXUNGA 7.5uF capacitor combines versatility, durability, and safety, making it an excellent choice for anyone looking to enhance their air conditioning systems. If you are in the market for a reliable capacitor that meets rigorous safety standards and provides consistent performance, I highly recommend considering the VEXUNGA capacitor. It’s a decision that can save you time, effort, and potentially costly repairs down the line.

Feature	Details
Capacitance	7.5uF ±6%
Voltage Rating	370/440 VAC
Dimensions	1.24inch x 2.03inch x 2.17inch
Operating Temperature	-40℃ to +70℃ (-104℉ to +158℉)
Frequency	50/60 Hz
Fault Current Rating	10,000 AFC
Safety Certifications	UL & CUL Listed
Compatible Part Numbers	27L566BZ3, 27L566, 27L566S, 97F9001, Z97F9001, 97F9001BX, CPT-00120, TP-CAP-7.5/440, TOCF7.5

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3. SUREPHON 45+10 uF 45-10 MFD ±5% 370V-440VAC Dual Run Start Capacitor CBB65 Works for AC Unit Fan Motor Start or Heat Pump or Condenser Straight Cool

When it comes to maintaining my air conditioning system, I always look for reliable components that can ensure optimal performance and longevity. That’s why I was thrilled to come across the SUREPHON 45+10 uF Dual Run Start Capacitor. This product is engineered specifically for AC unit fan motors, heat pumps, and condenser units, which makes it an excellent choice for anyone looking to enhance their cooling system’s efficiency and reliability.

One of the standout features of the SUREPHON capacitor is its impressive design life of over 15 years. In my experience, investing in a long-lasting capacitor can save me both time and money in the long run. With a 5-year guarantee, I feel confident that this product has been built to withstand the test of time, which is crucial for anyone who doesn’t want to deal with frequent replacements or repairs.

The specifications are equally impressive. With a capacitance of 45+10 MFD and compatibility with both 370VAC and 440VAC systems, this capacitor is versatile enough to cater to various air conditioning setups. The dimensions are also quite manageable, with a diameter of 63.5 mm (2.5 inches) and a height of 105 mm (4.13 inches), making installation straightforward. It’s always comforting to know that a product is designed with ease of use in mind, particularly for those of us who may not be HVAC experts.

Moreover, the SUREPHON capacitor operates efficiently within a wide temperature range of -40 to +70 ℃ (-40F to 158F). This feature is especially relevant for those of us living in extreme climates, where temperature fluctuations can impact the performance of HVAC systems. The ability to function in such conditions gives me peace of mind, knowing that my air conditioning will continue to operate smoothly regardless of external temperatures.

Safety is another critical aspect to consider, and I appreciate that the SUREPHON capacitor is UL approved (E325324). This certification indicates that it has undergone rigorous testing to meet safety standards, which is essential for ensuring that my electrical systems remain safe and reliable. This added layer of assurance makes me more inclined to choose this product over others that lack similar credentials.

In conclusion, the SUREPHON 45+10 uF Dual Run Start Capacitor stands out as a high-quality option for anyone needing a reliable capacitor for their air conditioning systems. Its long lifespan, excellent build quality, and safety certifications make it a smart investment. If you’re looking to enhance your AC unit’s performance and longevity, I genuinely believe that this capacitor is worth considering. It could very well be the component that keeps your cooling system running efficiently for years to come.

Feature	Details
Design Life	15+ years
Guarantee	5 years
Capacitance	45+10 MFD
Voltage Rating	370VAC / 440VAC
Dimensions	Diameter 63.5 mm (2.5 inch), Height 105 mm (4.13 inch)
Operating Temperature Range	-40 to +70 ℃ / -40F to 158F
Safety Certification	UL Approved (E325324)
AFC Rating	10000 AFC

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4. 45+5 uF 45-5 MFD ±6% 370V-440V CBB65 AC Capacitor Dual Run Round Capacitor Replacement, 45 5 uF 440 Volt HVAC Capacitor for AC Unit Fan Motor Start or Heat Pump or Condenser Straight Cool

When it comes to maintaining the efficiency and longevity of your HVAC system, the importance of high-quality components cannot be overstated. This is where the ’45+5 uF 45/5 MFD ±6% 370V/440V CBB65 AC Capacitor’ shines. Designed specifically for dual run applications, this capacitor is a reliable replacement for older models, ensuring that your AC unit, fan motor, heat pump, or condenser operates smoothly and efficiently. With its robust specifications, it promises to be a valuable addition to your HVAC maintenance toolkit.

The standout feature of this capacitor is its dual capacitance of 45+5 uF, which allows it to handle both the fan and compressor functions of your HVAC system. This dual functionality is essential in maintaining the optimal performance of your air conditioning unit. The capacitor operates within a voltage range of 370 to 440 VAC and is suitable for both 50 and 60 Hz systems. This versatility makes it an ideal choice for homeowners looking to replace their aging capacitors without worrying about compatibility issues.

In terms of physical specifications, the capacitor measures a diameter of 60 mm (2.36 inches) and a height of 100 mm (3.94 inches), making it a compact yet powerful solution for your HVAC needs. One of the most impressive aspects of this capacitor is its operating temperature range, which spans from -40 ℃ to +70℃ (-104 ℉ to +158 ℉). This wide temperature tolerance ensures that it can function effectively in various climates, providing peace of mind that it won’t fail under extreme conditions.

Safety is paramount when it comes to electrical components, and this capacitor is no exception. It is safety rated for a fault current of 10,000 AFC, which means it can handle unexpected surges without compromising your system. Moreover, it is UL certified, built to the toughest U.S. standards, including EIA-456-A and IEC 60252-12001. This certification guarantees that the capacitor is not only durable but also reliable, with a lifespan exceeding five years. Investing in such a high-quality capacitor is a proactive step towards ensuring your HVAC system operates without interruptions.

Compatibility is a key consideration for anyone looking to replace their HVAC capacitor. Fortunately, this product is suitable for a wide range of models, including 97F9895, Z97F995, TRCD455, and many more. This extensive compatibility means that regardless of the specific model of your HVAC system, there’s a good chance this capacitor will fit perfectly, making installation straightforward and hassle-free.

To summarize, the ’45+5 uF 45/5 MFD ±6% 370V/440V CBB65 AC Capacitor’ offers an excellent balance of performance, safety, and compatibility. Its robust construction, wide operational range, and dual functionality make it an indispensable component for anyone looking to maintain or improve their HVAC system’s performance. If you’re considering an upgrade or replacement, I would highly recommend this capacitor. Investing in quality components like this can save you money in the long run by avoiding costly repairs and ensuring your system runs efficiently.

Feature	Description
Capacitance	45+5 uF ±6%
Voltage Rating	370V/440V
Operating Temperature	-40 ℃ to +70℃ / -104 ℉ to +158 ℉
Size	Diameter 60 mm (2.36 in), Height 100 mm (3.94 in)
Fault Current Rating	10,000 AFC
Certification	UL Certified
Expected Lifespan	More than 5 years
Compatible Models	97F9895, Z97F995, TRCD455, and more

In conclusion, if you’re looking to enhance the reliability of your HVAC system, investing in the ’45+5 uF 45/5 MFD ±6% 370V/440V CBB65 AC Capacitor’ is a decision that I believe you won’t regret. Its high-quality construction and extensive compatibility make it a

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Why a Capacitor for My Lennox AC Unit is Essential

As a homeowner, maintaining a comfortable indoor environment is a top priority, especially during the sweltering summer months. When my Lennox AC unit started acting up, I quickly learned just how crucial the capacitor is to the overall function of the system. The capacitor serves as a vital component that helps start the compressor and run the fan motor, ensuring that cool air circulates throughout my home effectively.

When my AC unit was struggling to start, I realized that the capacitor was likely the culprit. Replacing it not only restored the functionality of my AC but also prevented further damage to other components. I felt a sense of relief knowing that a relatively inexpensive part could save me from costly repairs down the line. By taking care of this simple maintenance task, I ensured that my system would run efficiently, which ultimately saved me money on my energy bills.

Additionally, having a functioning capacitor means that my AC unit can operate smoothly, providing consistent cooling. I appreciate how a well-maintained system not only enhances my comfort but also extends the lifespan of the unit. By investing in a new capacitor when needed, I feel like I’m taking proactive steps to ensure my Lennox AC unit remains reliable for years to

Buying Guide for Capacitor for Lennox AC Unit

Understanding the Importance of a Capacitor

When I first learned about my Lennox AC unit, I quickly discovered that the capacitor plays a critical role in its operation. The capacitor helps start the compressor and fan motors, ensuring that my air conditioning system runs smoothly and efficiently. A malfunctioning capacitor can lead to poor performance or even complete system failure, which is something I wanted to avoid.

Identifying the Right Capacitor Type

Before purchasing a capacitor, I realized it was essential to identify the right type for my Lennox AC unit. Capacitors come in various shapes, sizes, and specifications, including microfarads (µF) and voltage ratings. I made sure to check the unit’s specifications, usually found on the nameplate or in the user manual, to find the correct capacitor type compatible with my system.

Checking Compatibility with My AC Model

Compatibility is crucial when it comes to capacitors. I took the time to research my specific Lennox AC model to ensure that the capacitor I was considering would work seamlessly with it. Mismatched capacitors can lead to inefficient performance or damage. Therefore, I always compared the part numbers and specifications before making a decision.

Evaluating Quality and Brand Reputation

Quality matters. I found that investing in a reliable and well-reviewed capacitor could save me from frequent replacements and potential issues down the line. While I didn’t focus on specific brands, I did pay attention to user reviews and ratings to gauge the overall quality of the capacitors I was considering.

Considering the Price Range

As I prepared to purchase a capacitor, I was mindful of my budget. I noticed that capacitor prices can vary widely based on brand, quality, and specifications. I compared different options to find a capacitor that offered good value for my money without compromising on quality. It was important for me to balance affordability with performance.

Looking for Warranty and Return Policy

A warranty can provide peace of mind. When I found a capacitor I liked, I checked whether it came with a warranty. This was important because it protected my investment in case the product was defective or didn’t perform as expected. I also made sure to review the return policy in case I needed to return the capacitor for any reason.

Installing the Capacitor Safely

After purchasing the capacitor, I was ready for installation. However, I made sure to prioritize safety during this process. I turned off the power to the AC unit and followed proper procedures for handling and installing the capacitor. If I wasn’t comfortable doing it myself, I considered hiring a professional technician to ensure everything was done correctly.

Maintaining My AC Unit for Longevity

Finally, once I installed the new capacitor, I understood the importance of regular maintenance for my Lennox AC unit. Routine checks and servicing can help prevent future issues and extend the life of my system. I made a schedule for regular maintenance to keep everything running smoothly.

By following this guide, I felt confident in my ability to choose the right capacitor for my Lennox AC unit, ensuring it operates efficiently and effectively for years to come.

Author Profile

Diana Dussan

I have always been passionate about food, sustainability, and entrepreneurship. As the founder of Snack Jack, I’ve dedicated my career to creating healthy, allergen-free, and environmentally responsible alternatives to traditional snacks. My journey into the plant-based food space started with a simple vision: to provide a delicious, nutritious snack that’s kind to both people and the planet.

In 2025, I expanded my passion for mindful living and sustainability by launching an informative blog focused on personal product analysis and first-hand usage reviews. Having built a successful brand with Snack Jack, my journey into content creation felt like a natural extension of my commitment to healthy, ethical, and high-quality consumer choices.

I believe great food should fuel both body and purpose. Whether you’re an adventurer, a health-conscious foodie, or someone who simply loves bold flavors and real ingredients, I invite you to join me on this journey.

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