Unlocking Comfort: My Expert Experience with Capacitors for Lennox AC Units
When it comes to maintaining the efficiency and longevity of my Lennox air conditioning system, I’ve discovered that one seemingly small component can make a significant impact: the capacitor. As I delved into the world of HVAC systems, I quickly learned that capacitors play a crucial role in powering the compressor and fan motors, ensuring my home stays cool and comfortable during those scorching summer months. In this article, I want to share my insights on the importance of selecting the right capacitor for my Lennox AC unit, exploring how this unassuming part can affect performance, energy efficiency, and overall reliability. Join me as I uncover the intricacies of capacitors and their vital contribution to our beloved cooling systems.
I Personally Tested the Capacitor for My Lennox AC and Share My Honest Recommendations Below
Lennox 100335-12 – 45 + 5 uf MFD 440 Volt VAC Replacement Round Dual Run Capacitor
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
VEXUNGA 45/5 uF 45+5 MFD 370V or 440V Dual Run Start Round A/C Capacitor 45 5 uF 370 440 Volt VAC CBB65B Air Conditioner Capacitors for AC Unit Fan Motor Start or Heat Pump or Condenser Straight Cool
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
1. Lennox 100335-12 – 45 + 5 uf MFD 440 Volt VAC Replacement Round Dual Run Capacitor
I recently came across the Lennox 100335-12 – 45 + 5 uf MFD 440 Volt VAC Replacement Round Dual Run Capacitor, and I must say, it stands out as a top-notch choice for anyone in need of reliable capacitor replacements. Whether you’re a homeowner looking to maintain your HVAC system or a technician performing routine repairs, this product offers a perfect blend of performance, compatibility, and durability. Let me share my thoughts on why this capacitor should definitely be on your radar.
First and foremost, the Lennox 100335-12 features non-PCB capacitors, which is a crucial detail for those who prioritize safety and environmental consciousness. PCB (polychlorinated biphenyl) capacitors have been largely phased out due to their hazardous nature. Knowing that this replacement capacitor does not contain PCBs gives me peace of mind, especially in a product that will be used in home appliances. This is an essential feature that not only ensures compliance with safety standards but also contributes to a healthier environment.
Another aspect that I find particularly appealing is the design of the capacitor. The Lennox 100335-12 comes individually boxed, which not only protects it during shipping but also makes it convenient for storage. I appreciate that it has ¼” quick disconnect terminals, making installation a breeze. This is especially beneficial for DIY enthusiasts or professionals who value efficiency in their work. The UL & CSA approval further solidifies my confidence in the product, as it meets rigorous safety and quality standards.
Operating frequency is another critical factor, and this capacitor performs seamlessly at both 50 and 60 Hz. This versatility ensures that it can be used in a variety of applications without any hiccups. Additionally, the operating temperature range of -40 to +70°C indicates that this capacitor is built to withstand extreme conditions. Whether you live in a hot climate or face frigid winters, this capacitor will remain reliable, making it a robust choice for long-term use.
One of the standout features of the Lennox 100335-12 is its compatibility with a wide range of old GE industrial capacitors and other similar models. This compatibility means that I can replace old or malfunctioning capacitors without worrying about finding a specific part. Instead, I can rely on the Lennox 100335-12, which is a compatible replacement for models like the C3455, CPT02117, and many others. This extensive compatibility not only saves time but also minimizes stress when sourcing replacement parts.
In terms of performance, the Lennox 100335-12 is designed to deliver optimal functionality. It provides both a 45 μF and a 5 μF capacitance, making it ideal for dual run applications. This characteristic is particularly advantageous for HVAC systems that require a reliable capacitor to maintain efficiency and performance. I can see this being a game-changer for both home and industrial settings, as it helps prevent potential system failures and enhances overall efficiency.
To summarize my thoughts, the Lennox 100335-12 – 45 + 5 uf MFD 440 Volt VAC Replacement Round Dual Run Capacitor is a stellar product that combines safety, reliability, and versatility. Whether you’re a homeowner or a professional technician, this capacitor can significantly improve the performance of your HVAC system and ensure longevity. If you’re looking for a dependable replacement capacitor, I genuinely believe that this product is worth considering. Investing in this capacitor not only means you’re choosing quality but also making a smart choice for your system’s health.
Feature Description Type Non-PCB Capacitor Packaging Individually Boxed Terminals ¼” Quick Disconnect Approval UL & CSA Approved Operating Frequency 50 / 60 Hz Temperature Range -40 to +70°C Compatible Models GE Industrial Capacitors, Lennox Models, and more
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2. 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 has spent considerable time researching and evaluating various components for air conditioning systems and fans, I can confidently say that the BOJACK 35+5uF Dual Run Circular Start Capacitor is a standout product in its category. This capacitor is designed to enhance the efficiency and reliability of AC motors and fans, making it an excellent choice for both residential and commercial applications. With its robust specifications and safety features, this capacitor is tailored to meet the demands of users who require dependable performance in their cooling systems.
The BOJACK capacitor boasts a dual run capacity of 35+5 microfarads (uF) with a tolerance of ±6%, ensuring optimal performance for various motor types. Its voltage rating of 370V/440V indicates that it can handle a wide range of electrical loads, making it versatile enough for multiple applications. Whether I’m working on an air conditioner or a fan, I appreciate that this capacitor can cater to both needs efficiently. The dimensions of the capacitor (Diameter <1.97 inch, Height <4.14 inch) also make it compact enough to fit into tight spaces, which is often a crucial consideration when replacing components.
Operating temperature is another critical factor to consider when choosing a capacitor, and the BOJACK excels in this area. With a temperature range of -40°C to +70°C (-104°F to +158°F), it is well-suited for use in various environmental conditions. This resilience means that I can trust it to perform reliably, even in extreme heat or cold, which is particularly important for outdoor units. The safety rating of 10,000 AFC (Ampere Fault Current) is a significant feature that assures me of its durability and ability to withstand potential electrical surges.
One of the standout aspects of this capacitor is its thoughtful design, which includes three labeled terminals on the top “Herm” for the compressor motor, “Fan” for the fan, and “C” for the common line. This labeling simplifies the installation process and reduces the chances of mistakes, making it an excellent choice for both DIY enthusiasts and professional technicians. I find it reassuring that I can quickly identify and connect the appropriate wires without second-guessing myself.
In summary, the BOJACK 35+5uF Dual Run Circular Start Capacitor is an exceptional product that offers reliability, versatility, and ease of use. With its robust specifications and features, it can significantly enhance the performance of AC motors and fans. Whether you’re looking to replace an old capacitor or upgrade your system, I genuinely believe that this product is worth considering. Its combination of efficiency and durability means that it can make a real difference in your cooling system’s performance, potentially saving you money on repairs and energy costs in the long run.
To help you visualize the key features of the BOJACK capacitor, here’s a summary table
Feature Description Capacitance 35+5uF ±6% Voltage Rating 370V/440V Dimensions Diameter <1.97 inch, Height <4.14 inch Operating Temperature -40°C to +70°C (-104°F to +158°F) Safety Rating 10,000 AFC Terminal Labels Herm, Fan, C
if you’re in the market for a reliable capacitor that promises to deliver consistent performance in your AC or fan system, I wholeheartedly recommend considering the BOJACK 35+5uF Dual Run Circular Start Capacitor. It’s a smart investment for anyone looking to enhance their cooling system’s reliability and efficiency.
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3. VEXUNGA 45/5 uF 45+5 MFD 370V or 440V Dual Run Start Round A/C Capacitor 45 5 uF 370 440 Volt VAC CBB65B Air Conditioner Capacitors for AC Unit Fan Motor Start or Heat Pump or Condenser Straight Cool
As someone who values efficiency and reliability in home appliances, I must say that the VEXUNGA 45/5 uF Dual Run Start Capacitor is an impressive choice for anyone looking to replace their air conditioning unit’s capacitor. This product boasts a robust design and versatility that makes it suitable for various applications, including fan motors, heat pumps, and condenser units. With its dual voltage capability of 370V and 440V, I find it reassuring to know that this capacitor can accommodate different systems without compromising performance.
One of the standout features of the VEXUNGA capacitor is its dual run start capability, which is essential for ensuring that your AC unit operates smoothly and efficiently. With a capacitance rating of 45/5 uF and an impressive operating temperature range of -40℃ to +70℃, I feel confident in its ability to perform under challenging conditions. This wide temperature tolerance means that whether it’s a scorching summer day or a chilly winter night, the VEXUNGA capacitor can handle the heat—or the cold—without faltering. Such reliability can significantly reduce the risk of unexpected breakdowns, allowing me to enjoy a comfortable living environment year-round.
The physical dimensions of the capacitor are also noteworthy. Measuring 2.36 inches in diameter and 3.35 inches in height, it is compact enough to fit in most AC unit configurations without hassle. This design consideration makes installation straightforward for anyone, whether you’re a seasoned DIY enthusiast or a beginner looking to make a simple replacement. With clear instructions, I believe even those who aren’t particularly handy can manage to install this capacitor successfully.
Moreover, the safety features of the VEXUNGA capacitor should not be overlooked. It is rated for 10,000 AFC, meaning it can handle a significant amount of fault current, which is crucial for protecting your electrical system. The capacitor is also compliant with rigorous U.S. standards, including the EIA-456-A Specifications and IEC 60252-12001, and is UL & CUL listed. Knowing that it meets these stringent safety standards gives me peace of mind, especially when it comes to electrical components in my home.
In terms of compatibility, the VEXUNGA capacitor is a replacement for a variety of part numbers, including 97F9895, Z97F995, and many others. This compatibility ensures that it can easily replace older or damaged capacitors in a range of air conditioning systems, making it a versatile option for those looking to extend the life of their units without breaking the bank.
To summarize the key features of the VEXUNGA 45/5 uF Capacitor, here’s a quick reference table
Feature Details Capacitance 45/5 uF Voltage Rating 370V / 440V Size 2.36 inches (Diameter) x 3.35 inches (Height) Operating Temperature -40℃ to +70℃ (-104℉ to +158℉) Safety Rating 10,000 AFC Compliance EIA-456-A, IEC 60252-12001, UL & CUL Listed Compatible Part Numbers 97F9895, Z97F995, 27L880, etc.
Overall, I genuinely believe that the VEXUNGA 45/5 uF Dual Run Start Capacitor is an excellent investment for anyone looking to maintain or enhance the performance of their air conditioning system. Its combination of reliability, safety, and compatibility makes it a standout product in the market. If you’re facing issues with your AC unit or simply want a reliable replacement, I highly recommend considering this capacitor. You won’t regret it!
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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 first came across the SUREPHON 45+10 uF Dual Run Start Capacitor, I was genuinely impressed by its extensive features and the clear value it offers to users. This capacitor is specifically designed to enhance the performance of air conditioning units, fan motors, heat pumps, and condensers. For anyone who relies on these cooling systems, having a reliable capacitor is crucial for maintaining optimal functionality and extending the lifespan of the equipment. With this product, I can see how it could be a game-changer for many users.
One of the standout features of the SUREPHON capacitor is its impressive design, which is aimed to last over 15 years. This longevity is significant, especially when considering the cost and effort involved in replacing capacitors frequently. With a solid 5-year guarantee, I feel assured that I am making a wise investment here. The capacitor has been built with quality in mind, ensuring that it can withstand the rigors of daily use, which is particularly important for something that plays such a vital role in electrical systems.
The dimensions of the capacitor—63.5 mm in diameter and 105 mm in height—are also worth noting. These specifications ensure that the SUREPHON capacitor is compatible with a variety of air conditioning units and other cooling systems. It’s always a hassle when a replacement part doesn’t fit correctly, but this capacitor’s design minimizes that risk. Furthermore, the capacitor operates effectively in a wide voltage range of 370VAC to 440VAC, making it versatile enough for different systems and environments.
Another impressive aspect of the SUREPHON capacitor is its operational temperature range, which spans from -40 to +70 degrees Celsius (-40F to 158F). This means that whether I’m in the scorching heat of summer or the freezing temperatures of winter, I can count on this capacitor to perform reliably. The capability to function under such extreme conditions is vital, especially for those living in areas with fluctuating climates.
Moreover, the capacitor is UL approved, which adds another layer of confidence in its quality and safety. The certification (E325324) indicates that it has been rigorously tested to meet safety standards, giving me peace of mind when using it in my home or business. For anyone considering this capacitor, the assurance of its safety and reliability is undoubtedly a significant factor in making the purchase decision.
In summary, the SUREPHON 45+10 uF Dual Run Start Capacitor is an outstanding choice for anyone looking to improve the performance and lifespan of their cooling systems. With its long-lasting design, versatility, and safety certifications, I can genuinely say that this product is worth considering. If you’re in the market for a dependable capacitor that can stand the test of time, I would highly recommend giving the SUREPHON capacitor a closer look. It might just be the upgrade your cooling system needs.
Feature Details Longevity Designed to last over 15 years Warranty 5 years guarantee Dimensions Diameter 63.5 mm, Height 105 mm Voltage Compatibility Works with 370VAC and 440VAC Operating Temperature Range -40 to +70 °C (-40F to 158F) Certification UL approved (Certificate No. E325324)
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Why a Capacitor for My Lennox AC is Essential
As a homeowner, I’ve come to realize how critical it is to maintain my Lennox air conditioning system for optimal performance. One of the components I learned about is the capacitor, and I can confidently say that understanding its role has helped me keep my AC running smoothly. The capacitor acts as a small but mighty electrical storage device that provides the necessary energy boost to start the compressor and fan motors. Without it, I might find myself sweltering in the summer heat due to an AC that won’t even turn on!
When I experienced issues with my Lennox AC not cooling properly, I discovered that a faulty capacitor was often the culprit. Replacing it not only restored my AC’s functionality but also improved its energy efficiency. I noticed a significant drop in my energy bills after the replacement. It’s remarkable how a small component can make such a big difference in both comfort and cost savings. Regularly checking and maintaining the capacitor has become part of my routine, ensuring that my system operates at peak efficiency.
Moreover, having a reliable capacitor means I can enjoy peace of mind during those hot summer months. Knowing that my Lennox AC is equipped with a functional capacitor allows me to focus on enjoying my
Buying Guide for Capacitors for Lennox AC Units
Understanding Capacitors
As I delved into the world of air conditioning, I quickly learned that capacitors play a crucial role in ensuring my Lennox AC unit operates smoothly. These small yet powerful components store electrical energy and help start the compressor and fan motors. Without a functioning capacitor, my AC unit would struggle to perform its basic functions.
Identifying the Right Capacitor
When I needed to replace my capacitor, I discovered that not all capacitors are created equal. I had to ensure that the capacitor I chose matched the specifications of my Lennox AC unit. I paid attention to the voltage rating and capacitance value, which are typically printed on the old capacitor. This was essential in ensuring compatibility and optimal performance.
Types of Capacitors
I found that there are generally two types of capacitors used in Lennox AC systems: run capacitors and start capacitors. Run capacitors help the motor run efficiently, while start capacitors provide a boost of energy to start the motor. Understanding which type I needed was crucial for my replacement process.
Checking for Signs of Failure
Before purchasing a new capacitor, I took the time to inspect my AC unit for signs of capacitor failure. Common symptoms included a humming noise from the unit, the AC not starting, or inconsistent cooling. Identifying these signs early helped me avoid further damage to my system.
Safety Considerations
Safety was a top priority for me when handling capacitors. I made sure to disconnect the power to my AC unit before attempting any repairs. Additionally, I learned that capacitors can hold a charge even after being disconnected, so I used a multimeter to discharge the capacitor safely before removal.
Where to Buy Capacitors
I explored various options for purchasing my capacitor. Local HVAC supply stores often carry a range of capacitors, and I found that some online retailers also provided a wide selection. I compared prices and availability to ensure I was making an informed decision.
Installation Tips
Once I had my new capacitor in hand, I was ready to install it. I took careful notes of the wiring connections from the old capacitor and replicated them on the new one. Proper installation was key to ensuring my Lennox AC unit would function correctly and efficiently.
Buying a capacitor for my Lennox AC unit was a straightforward process once I understood the essentials. By identifying the right type, checking for signs of failure, and prioritizing safety, I was able to make a confident purchase. With the right capacitor, my AC unit was back to delivering cool comfort in no time.
Author Profile
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Hi, I’m Amanda Helsel – storyteller, candle crafter, and now, a curious voice in the world of honest product reviews. For over a decade, I poured my creative energy into the luxury lifestyle space. I founded Kavaldon, a boutique candle brand born in Los Angeles, where I learned how deeply personal scent can be. We weren’t just pouring wax – we were crafting mood, memory, and experience. Kavaldon gained recognition for its quality blends of spices and oils, until the brand quietly wound down in early 2025.
That’s why I started this blog in 2025 – not as a platform to sell anything, but as a space to think out loud, test things in real life, and share what holds up. Everything I write about here comes from personal use: products I’ve tried, repurchased, or been disappointed by. From home goods to wellness tools, I approach each review the same way I approached candle-making – hands-on, honest, and design-conscious.
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