Choosing the Right Capacitor for Your Lennox AC: My Expert Experience and Insights

As a homeowner, I’ve often found myself in the midst of unexpected HVAC challenges, and one component that frequently comes into play is the capacitor. Specifically, when it comes to my Lennox AC unit, understanding the role of the capacitor has been a game changer in maintaining optimal performance. This unassuming little device, often overlooked, is essential for the smooth operation of my air conditioning system. It not only helps kickstart the compressor and fan motors but also plays a crucial role in energy efficiency. In this article, I’ll delve into the importance of the capacitor for Lennox AC units, exploring how it works, why it’s vital to my system, and what signs to look for when it might be time for a replacement. Join me as I uncover the often-misunderstood heart of my cooling system!

I Personally Evaluated The Capacitor For My Lennox AC And Here Are My Honest Recommendations

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

As someone who often delves into the world of electrical components, I find the BOJACK 35+5uF Dual Run Circular Start Capacitor to be an exemplary product that meets the needs of both DIY enthusiasts and professionals. This capacitor is designed with a dual function, making it an essential component for anyone dealing with AC motors, fans, or condensers. Its specifications indicate that it can handle a capacitance of 35+5uF with a tolerance of ±6%, which is crucial for ensuring optimal performance in various applications.

One of the standout features of the BOJACK capacitor is its impressive voltage rating of 370V/440V. This high voltage rating assures me that it can withstand significant electrical demands, making it suitable for a wide range of equipment. Whether I’m working on a residential air conditioning unit or a commercial fan, I can trust that this capacitor will perform reliably under pressure. Additionally, the capacitor’s operating temperature range of -40℃ to +70℃ (-104℉ to +158℉) means it can function effectively in extreme conditions, which is a significant advantage for outdoor installations or environments with fluctuating temperatures.

I also appreciate the safety features built into the BOJACK capacitor, particularly its safety rating of 10,000 AFC (Amps Fault Current). This rating gives me peace of mind, knowing that the capacitor is designed to handle potential surges and faults safely. It’s a critical aspect for those of us who prioritize safety in our electrical projects. The three terminals on the top of the capacitor are clearly labeled “Herm”/”H” for the compressor motor, “Fan”/”F” for the fan, and “C” for the common line. This labeling simplifies the installation process and reduces the likelihood of errors, making it user-friendly even for those who may not be electrical experts.

In terms of physical dimensions, the BOJACK capacitor measures a diameter of less than 1.97 inches and a height of less than 4.14 inches. This compact size allows for easy installation in tight spaces, a feature that I find particularly beneficial when working with limited room in electrical panels or appliances. It strikes a balance between functionality and convenience, ensuring that I can fit it into various setups without hassle.

Overall, I believe that the BOJACK 35+5uF Dual Run Circular Start Capacitor is an excellent investment for anyone looking to ensure optimal performance in their AC motors, fans, or condensers. Its robust specifications, combined with user-friendly features and safety ratings, make it a standout choice in the market. If you’re in need of a reliable and efficient capacitor, I would highly recommend considering the BOJACK capacitor. It has certainly proven to be a dependable component in my projects, and I believe it will serve you well too.

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

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2. Lennox 100335-12 – 45 + 5 uf MFD 440 Volt VAC JARD Replacement Round Dual Run Capacitor

As I delve into the analysis of the Lennox 100335-12 – 45 + 5 uf MFD 440 Volt VAC JARD Replacement Round Dual Run Capacitor, I am genuinely impressed by its robust features and compatibility. This product is designed for those who prioritize efficiency and reliability in their HVAC systems. Whether you are a homeowner looking to maintain your air conditioning unit or a technician needing a reliable replacement part, this capacitor stands out for several reasons.

One of the most notable features of the Lennox 100335-12 is that it is a non-PCB capacitor. This is crucial because PCB (Polychlorinated Biphenyls) can be harmful to both human health and the environment. By opting for a product that avoids PCBs, I feel more confident in making a responsible choice that aligns with safety standards. Additionally, this capacitor is UL & CSA approved, which means it has met rigorous safety and performance standards. This certification adds an extra layer of assurance that it will perform reliably when installed.

The design of the Lennox capacitor also caters to convenience and user-friendliness. It comes individually boxed, making it easy to store and handle, particularly for professionals who may be dealing with multiple units. The ¼” quick disconnect terminals are a standard feature that simplifies installation, ensuring that even those with limited technical skills can replace their capacitor without hassle. This ease of installation is something I truly appreciate, as it saves time and reduces the risk of errors during setup.

When it comes to performance, this capacitor operates effectively within a frequency range of 50/60 Hz, and it can withstand a temperature range of -40 to +70°C. This wide operational range makes it suitable for various environments, from extremely cold regions to hotter climates. Knowing that it can function optimally under varying conditions gives me confidence in its reliability. The compatibility list is extensive, covering old GE industrial capacitors, Mars models, and several others, which means that it can serve as a versatile replacement for many existing systems. This adaptability is a significant advantage for users who may have different brands or models of HVAC equipment.

In summary, the Lennox 100335-12 capacitor is a solid choice for anyone needing a reliable and efficient replacement. Its safety certifications, ease of installation, and broad compatibility make it an attractive option for both DIY enthusiasts and professionals alike. If you find yourself in need of a replacement capacitor, I would strongly encourage you to consider this product. It combines quality with practicality, ensuring that your HVAC system runs smoothly and efficiently. Investing in this capacitor could ultimately save you time and money in repairs, making it a wise decision for your maintenance needs.

Feature	Details
Type	Non-PCB Capacitor
Packaging	Individually Boxed
Terminal Type	¼” Quick Disconnect Terminals (Standard)
Approval	UL & CSA Approved
Operating Frequency	50 / 60 Hz
Temperature Range	-40 to +70°C
Compatibility	Compatible with various models, including GE Industrial Capacitors and Mars Capacitors

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3. BOJACK 45+5 uF 45-5 MFD ±6% 370V-440VAC CBB65 Dual Run Circular Start Capacitor for AC Motor Run or Fan Start or Condenser Straight

As someone who has spent considerable time researching and analyzing electrical components, I can confidently say that the BOJACK 45+5 uF Dual Run Circular Start Capacitor stands out as a reliable choice for anyone looking to optimize their air conditioning unit or fan systems. This capacitor is designed to effectively support AC motors, making it an essential component for both residential and commercial applications. Whether you’re a DIY enthusiast or a professional technician, the features of this product make it a worthy investment.

One of the most impressive aspects of the BOJACK capacitor is its dual-run capability, which allows it to operate efficiently in both motor run and fan start applications. The capacitor’s specifications—45+5 microfarads with a tolerance of ±6%—ensure that it provides the necessary power to start and run your equipment smoothly. This feature is particularly beneficial for users who want to enhance the efficiency of their HVAC systems or fans, ultimately leading to energy savings and improved performance.

The capacitor’s dimensions are also noteworthy. With a diameter of 65 mm (2.56 inches) and a height of 95 mm (3.74 inches), it is compact enough to fit into various setups without taking up excessive space. This is an important factor for those who may have limited room in their electrical systems. Furthermore, its operating temperature range of -40℃ to +70℃ (-104℉ to +158℉) ensures that it can handle extreme conditions, making it a versatile option for different climates.

Safety is another critical element to consider when selecting a capacitor, and the BOJACK model does not disappoint. With a safety rating of 10,000 AFC (Amps Fault Current), I feel reassured about its reliability and durability. This level of safety is particularly important for users who want to avoid potential electrical hazards, ensuring that the capacitor performs safely under various operational demands.

Installation is straightforward, thanks to the three clearly labeled terminals on the top of the capacitor. These terminals are marked “Herm”/”H” for the compressor motor, “Fan”/”F” for the fan, and “C” for the common line, making it easy for anyone—regardless of their technical expertise—to connect the capacitor correctly. This user-friendly design is a significant advantage for those who may not have extensive experience with electrical components.

Moreover, the BOJACK capacitor serves as a direct replacement for several models, including 97F9895, Z97F995, and many others. This compatibility means you won’t have to worry about whether it will fit your specific system; it is designed to replace various brands effortlessly. This feature adds to its appeal, especially for those looking to perform quick replacements without compromising on quality.

In summary, the BOJACK 45+5 uF Dual Run Circular Start Capacitor is a robust, reliable, and user-friendly option for anyone looking to enhance their air conditioning or fan systems. Its combination of efficiency, safety, and compatibility makes it an excellent choice for both personal and professional use. If you’re looking to improve the performance of your HVAC system or ensure your fans start reliably, I highly recommend considering this product. Investing in a quality capacitor like this one could significantly enhance your system’s efficiency and longevity.

Feature	Specification
Capacitance	45+5 µF ±6%
Voltage	370V/440V
Dimensions	Diameter 65 mm (2.56 inch), Height 95 mm (3.74 inch)
Operating Temperature	-40℃ to +70℃ (-104℉ to +158℉)
Safety Rating	10,000 AFC
Terminal Labels	Herm (H), Fan (F), Common (C)
Replacement Models	97F9895, Z97F995, etc.

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4. 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 I came across the SUREPHON 45+10 uF Dual Run Start Capacitor, I immediately recognized it as a product that could significantly enhance the performance of my air conditioning units and heat pumps. The specifications alone made me take a closer look. Designed to work efficiently for over 15 years, this capacitor promises longevity and reliability, which is something I always seek in HVAC components. With a 5-year guarantee included, I felt reassured about my investment. In a world where components often fail prematurely, having this kind of assurance is invaluable.

The capacitor’s technical specifications are impressive as well. With a capacitance of 45+10 MFD and compatibility with both 370VAC and 440VAC systems, this product is versatile enough to cater to a variety of air conditioning setups. As someone who has had to deal with compatibility issues in the past, I find it incredibly beneficial that this capacitor can serve multiple applications, whether it’s for starting up an AC unit, fan motor, or a heat pump. The A-Class rating and ability to handle up to 10,000 AFC are indicators of its high performance and reliability, which I find essential for any HVAC application.

Moreover, the operating temperature range of -40 to +70 ℃ (-40F to 158F) means that this capacitor can perform well in a wide range of environmental conditions. This feature is particularly appealing to me because it assures that whether it’s a scorching summer day or a chilling winter night, the SUREPHON capacitor will continue to work efficiently. It’s comforting to know that I can rely on a product that has been built to withstand extreme temperatures, which is a common issue in many regions.

Another aspect that I found worth mentioning is the compact design of the capacitor. With a diameter of 63.5 mm (2.5 inches) and a height of 105 mm (4.13 inches), it fits easily into many existing setups without requiring extensive modifications. This convenience is something that I truly appreciate, especially when I think about the hassle involved in replacing larger or bulkier components.

In summary, the SUREPHON 45+10 uF Dual Run Start Capacitor stands out as a high-quality, reliable choice for anyone looking to enhance their air conditioning or heating system. Its impressive lifespan, extensive compatibility, and robust performance features make it a product that I would confidently recommend to others. If you’re considering an upgrade or replacement for your HVAC systems, I believe this capacitor could be a smart decision that will pay dividends in efficiency and reliability. Don’t miss out on the opportunity to invest in a product that is designed to last and perform exceptionally well under various conditions.

Feature	Specification
Capacitance	45+10 MFD
Voltage Rating	370VAC / 440VAC
Operating Temperature Range	-40 to +70 ℃ / -40F to 158F
Dimension	Diameter 63.5 mm / Height 105 mm
Expected Lifespan	15 years
Guarantee	5 years
AFC Rating	10000 AFC
UL Approval	E325324

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Why a Capacitor for My Lennox AC is Essential

As a homeowner, I’ve learned the hard way that maintaining my HVAC system is crucial for comfort and efficiency. One of the most significant components in my Lennox air conditioning unit is the capacitor. Initially, I didn’t think much about it, but I quickly realized how vital this small part is for the overall performance of my AC. The capacitor helps start the compressor and the blower motor, ensuring that my home stays cool, especially during those sweltering summer months.

When my AC began to struggle with cooling, I did some research and discovered that a faulty capacitor could be the culprit. I decided to replace it, and the difference was remarkable! My AC started running more smoothly, and I noticed a significant improvement in energy efficiency. This not only kept my home comfortable but also helped lower my energy bills. I could feel the cool air circulating more effectively, and it was a relief knowing my system was working optimally.

In summary, investing in a quality capacitor for my Lennox AC has proven to be a smart decision. It’s a small part that plays a massive role in the performance and longevity of my cooling system. By ensuring that my capacitor is in good condition, I can

Buying Guide for Capacitors for Lennox AC Units

Understanding Capacitors

When I first started exploring the world of HVAC systems, I quickly realized the significance of capacitors in air conditioning units. Capacitors are essential for starting and running the compressor and fan motors in my Lennox AC. They store electrical energy and release it when needed, making them critical for the efficient operation of my system.

Identifying the Right Capacitor

One of the first things I learned was that not all capacitors are created equal. I had to pay attention to the specifications of my Lennox AC unit. I checked the voltage rating and capacitance value, which is typically measured in microfarads (µF). Ensuring these numbers matched was vital for proper compatibility.

Signs of a Failing Capacitor

In my experience, recognizing the signs of a failing capacitor can save me from costly repairs. I noticed that my AC unit started making unusual humming noises, or it struggled to start. Sometimes, the system would shut down unexpectedly. If I had these symptoms, it was a clear indication that I needed to check the capacitor.

Choosing the Right Voltage Rating

I learned that the voltage rating of the capacitor is crucial. My Lennox AC required a capacitor with a specific voltage rating to ensure it operates safely and efficiently. I always made sure to choose a capacitor that met or exceeded the original voltage to avoid any potential issues.

Selecting the Correct Capacitance Value

I discovered that the capacitance value is equally important. The wrong capacitance can lead to inadequate performance or even damage to my AC unit. I made sure to refer to the specifications provided by Lennox or the original capacitor to find the right capacitance value.

Quality and Durability

In my quest to find a replacement capacitor, I came across various brands and types. I realized that investing in a high-quality capacitor was essential for long-term reliability. While I avoided cheaper options, I focused on those known for durability and performance.

Installation Considerations

When it came time to replace the capacitor, I had to consider installation. I felt confident in my ability to do it myself, but I always prioritized safety. I made sure to disconnect the power supply before starting any work. If I was unsure, I wouldn’t hesitate to consult a professional.

Budgeting for Replacement

Finally, I needed to set a budget for the capacitor replacement. I found that prices could vary widely based on quality and specifications. I made sure to balance cost with quality, so I didn’t end up with a subpar product that would need replacing again soon.

Conclusion

Buying a capacitor for my Lennox AC unit was a learning experience. By understanding the importance of specifications, recognizing signs of failure, and prioritizing quality, I felt confident in my choices. With proper care, my capacitor replacement would ensure my AC system runs smoothly for years to come.

Author Profile

Jarrod Bennett

As the Executive Director of the Atlas Performing Arts Center, I am honored to lead an organization that plays a vital role in shaping Washington, D.C.'s artistic and cultural landscape. Since assuming this role in August 2024. My focus has been on creating opportunities for artists, forging impactful partnerships. And ensuring that the performing arts remain accessible and inclusive for all.

Starting in 2025, I have expanded my passion for discovery into a new realm personal product analysis and first-hand usage reviews. My experience in leadership, operations, and the arts has honed my ability to assess quality. Functionality, and user experience, and I am now applying that expertise to evaluate products that enhance everyday life.

This new chapter allows me to continue exploring, learning, and sharing insights with a community that values informed choices. I look forward to offering honest recommendations. And connecting with readers who seek trustworthy product reviews.

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