How I Found the Perfect Capacitor for My Lennox AC: Expert Tips and Personal Experience

When it comes to keeping my Lennox AC running smoothly, I’ve learned that every component plays a crucial role—especially the capacitor. This small but mighty part is often overlooked, yet it’s essential for the efficient operation of the system. Understanding the importance of the capacitor for Lennox AC units has given me a new appreciation for how these cooling systems work and what it takes to maintain them. Whether you’re a homeowner or just curious, knowing about this key component can make all the difference when it comes to comfort and performance.

I Took On Testing The Capacitor For Lennox AC Myself 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

When I first came across the BOJACK 35+5uF 35 5 MFD ±6% 370V/440V CBB65 Dual Run Circular Start Capacitor, I was intrigued by its specific design for AC motor run, fan start, or condenser applications. This capacitor seems thoughtfully engineered to address the needs of those working with HVAC units, compressors, or fans that require reliable starting and running performance. The dual run feature—combining 35uF and 5uF capacitance—offers versatility and efficiency, making it a solid choice for anyone looking to maintain or upgrade their motor systems.

One aspect I really appreciate is the operating voltage range of 370V to 440V, which ensures that this capacitor can handle a variety of electrical environments without compromising safety or performance. The ±6% capacitance tolerance also suggests consistency and reliability, which is crucial when dealing with motor start and run capacitors. It means that I can expect the capacitor to perform close to its rated values, helping motors start smoothly and run efficiently, minimizing wear and tear over time.

The physical dimensions—diameter less than 1.97 inches and height less than 4.14 inches—make this capacitor compact enough to fit into tight spaces within motor housings or electrical panels. This is a practical feature that I find valuable because space constraints are common in HVAC and motor repair work. Additionally, the operating temperature range from -40℃ to +70℃ (-104℉ to +158℉) means this capacitor is built to withstand harsh environments, whether it’s freezing winter conditions or the heat generated during heavy motor operation. For me, that adds a layer of confidence that it won’t fail prematurely due to temperature extremes.

Safety is another big plus with this product. The capacitor is rated for 10,000 AFC (Ampere Fault Current), which indicates it can safely handle fault conditions without catastrophic failure. This gives me peace of mind, especially when working on systems that could experience electrical surges or unexpected faults. The clearly labeled three terminals on top—“Herm” or “H” for the compressor motor, “Fan” or “F” for the fan, and “C” for the common line—make installation straightforward and reduce the risk of wiring errors. This thoughtful labeling is a small but significant convenience that saves time and prevents mistakes during maintenance or replacement tasks.

Overall, I see the BOJACK 35+5uF Dual Run Circular Start Capacitor as a reliable, durable, and well-designed component for anyone dealing with AC motors, fan starts, or condenser units. It combines robust electrical specifications with practical physical design and safety features, making it a dependable choice. If you’re looking for a capacitor that balances performance, reliability, and ease of installation, this product is definitely worth considering. It might just be the component that ensures your motor systems run smoothly and efficiently for a long time.

Feature	Specification	Benefit to User
Capacitance	35+5uF ±6%	Dual capacitance supports both motor run and fan start functions efficiently
Voltage Rating	370V/440V	Wide voltage compatibility ensures safe operation across different motor systems
Dimensions	Diameter < 1.97 inch, Height < 4.14 inch	Compact size fits easily in tight motor compartments
Operating Temperature	-40℃ to +70℃ (-104℉ to +158℉)	Durable in extreme temperature conditions, enhancing longevity
Safety Rating	10,000 AFC	High fault current rating improves safety and reliability
Terminal Labels	“Herm”/”H”, “Fan”/”F”, “C”	Clear labeling simplifies installation and reduces wiring errors

Get It From Amazon Now: Check Price on Amazon & FREE Returns

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

When I first came across the Lennox 100335-12 – 45 + 5 uf MFD 440 Volt VAC Replacement Round Dual Run Capacitor, I immediately recognized its potential as a reliable and efficient component for HVAC systems. This capacitor is designed to replace a variety of older GE industrial capacitors and other similar models, which gives me confidence that it has broad compatibility and can fit seamlessly into many different setups. The fact that it is a dual run capacitor with a 45 + 5 microfarad rating and a voltage capacity of 440 volts means it is built to handle the electrical demands of both the fan and compressor motors simultaneously, enhancing overall system performance.

One feature that stands out to me is that this capacitor is non-PCB, which is crucial for safety and environmental reasons. PCBs (polychlorinated biphenyls) have been banned due to their toxic nature, so having a non-PCB capacitor reassures me that this product aligns with modern safety standards. Additionally, each unit is individually boxed, which suggests careful handling and protection during shipping and storage. This attention to detail is important because it reduces the risk of damage before installation.

The inclusion of ¼” quick disconnect terminals is another practical advantage. These terminals are standard and make installation straightforward, saving time and effort—especially if I or anyone else working on the HVAC system prefers a plug-and-play experience without complicated wiring. It also means that if I ever need to replace the capacitor again, the process will be hassle-free.

From an operational standpoint, the capacitor supports both 50 and 60 Hz frequencies, making it versatile for use in different regions or applications. It also operates reliably in a wide temperature range from -40 to +70°C, which means it can withstand various environmental conditions without degrading. For me, this means fewer worries about performance dips or premature failures caused by temperature extremes.

The product’s UL and CSA approvals are significant markers of quality and safety compliance. These certifications indicate that the capacitor has undergone rigorous testing and meets high standards, which reinforces my trust in its durability and reliability. Knowing this helps me feel more secure about investing in this capacitor for my HVAC needs.

What really helps me decide is the extensive list of compatible replacements mentioned from old GE capacitors like C3455 and C4455 series to Lennox models such as 89M80 and 100335-12, plus a wide range of CPT, Mars, SUPCO, and other brand equivalents. This compatibility means I can confidently use this capacitor as a substitute for many legacy parts, which is a huge plus if I have an older system or need to find a readily available replacement without compromising on specs.

To summarize my thoughts, here’s a quick comparison of the key features and benefits that make this capacitor a worthwhile choice

Feature	Benefit
Dual Run Capacitor 45 + 5 uf MFD	Supports both fan and compressor motors for efficient HVAC operation
440 Volt VAC Rating	Handles high voltage demands safely and reliably
Non-PCB Material	Environmentally friendly and safe to use
Individually Boxed	Ensures protection during shipping and storage
¼” Quick Disconnect Terminals	Easy and quick installation or replacement
UL & CSA Approved	Certified for safety and quality assurance
50 / 60 Hz Operating Frequency	Compatible with various electrical systems worldwide
-40 to +70°C Operating Temperature	Operates reliably in extreme temperature conditions
Wide Compatibility with Older GE, Lennox, Mars, SUPCO Capacitors	Flexible replacement option for many HVAC models

Overall, I find the Lennox 100335-12 capacitor to be a solid investment for anyone looking to replace an aging or faulty capacitor in their HVAC system. Its safety features, ease of installation, broad compatibility, and robust operating specifications make it an excellent choice that can help restore or improve system efficiency. If you want a

Get It From Amazon Now: Check Price on Amazon & FREE Returns

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

When I first came across the BOJACK 45+5 uF 45/5 MFD ±6% 370V/440VAC CBB65 Dual Run Circular Start Capacitor, I was immediately drawn to its robust specifications and versatile design. This capacitor is specifically designed for AC motor run or fan start applications, which means it’s tailored to enhance the performance and reliability of various motors and condensers. For anyone like me who needs a dependable component for motor operation, this product offers a compelling blend of durability and efficiency.

One of the standout features of this capacitor is its dual run configuration with two capacitance ratings—45 uF and 5 uF—both within a tight tolerance of ±6%. This ensures precise performance, which is critical for maintaining the optimal start and run conditions of motors and fans. The voltage rating of 370V to 440VAC also provides a good safety margin, allowing it to handle typical household or industrial voltages with confidence. I appreciate the fact that it’s built to work within a wide operating temperature range, from -40℃ to +70℃ (-104℉ to +158℉), making it suitable for use in various environments without compromising performance.

Dimension-wise, the capacitor’s size (65 mm diameter and 95 mm height) is quite standard, meaning it should fit seamlessly into most compatible motor housings. The inclusion of three clearly labeled terminals—“Herm” (H) for the compressor motor, “Fan” (F) for the fan, and “Common” (C) for the shared line—adds to the ease of installation and ensures that even those who are not professional electricians can confidently replace or install it. This labeling system reduces the chances of wiring errors, which is a big relief for me when working on electrical components.

Safety is paramount when dealing with electrical parts, and the BOJACK capacitor’s 10,000 AFC (Ampere Fault Current) rating reassures me that it can handle fault conditions without posing undue risk. This safety feature, combined with its compliance as a replacement for numerous OEM part numbers—such as 97F9895, Z97F995, TRCD455, and many others—means it’s a versatile, reliable substitute for many existing capacitors on the market. This compatibility is invaluable because it means I don’t have to hunt down an exact match but can trust this product to work effectively across a range of equipment.

To give a clearer snapshot of what this capacitor offers, here’s a quick comparison table highlighting its key features

Feature	Specification
Capacitance	45+5 uF ±6%
Voltage Rating	370V/440VAC
Capacitor Type	CBB65B Dual Run Circular Start Capacitor
Dimensions	Diameter 65 mm (2.56 inch), Height 95 mm (3.74 inch)
Operating Temperature Range	-40℃ to +70℃ (-104℉ to +158℉)
Safety Rating	10,000 AFC
Terminal Labels	Herm (H), Fan (F), Common (C)
Compatibility	Replacement for multiple OEM parts (e.g., 97F9895, TRCD455)

In summary, I find the BOJACK 45+5 uF capacitor to be a highly reliable and user-friendly product that meets the needs of anyone looking to maintain or upgrade their AC motor or fan start system. The combination of precise capacitance, robust voltage tolerance, clear terminal labeling, and broad compatibility makes it a smart choice. If you are like me and want to avoid the hassle of sourcing multiple parts or dealing with uncertain quality, this capacitor is definitely worth considering. Its design and ratings inspire confidence, and investing in it could save you time, effort, and potential future repair costs. I would honestly recommend it to anyone needing a solid capacitor solution for their motors or fans.

Get It From Amazon Now: Check Price on Amazon & FREE Returns

4. 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

When I first came across the VEXUNGA 45/5 uF 45+5 MFD 370V or 440V Dual Run Start Round A/C Capacitor, I was immediately impressed by its versatility and robust design. This capacitor is specifically engineered to serve as a dual run start capacitor, making it ideal for air conditioner units, fan motors, heat pumps, and condensers with straight cool configurations. The dual capacitance rating of 45+5 microfarads (MFD) means it can effectively support both the compressor and fan motor start functions, which is crucial for smooth and efficient operation of HVAC systems.

One of the standout features for me is the capacitor’s compatibility with both 370V and 440V systems. This dual-voltage capability adds a layer of flexibility that many other capacitors lack, meaning I don’t have to worry about finding a separate capacitor for different voltage systems. The ±6% tolerance ensures reliable performance within a tight range, which is essential for maintaining the consistent operation of my AC unit. Moreover, the operating temperature range of -40℃ to +70℃ (-104℉ to +158℉) means this capacitor is built to withstand extreme environmental conditions, ensuring longevity whether it’s the height of summer or the coldest winter days.

From a practical perspective, the physical size of the capacitor—about 2.36 inches in diameter and 3.35 inches in height—makes it a perfect fit for most standard AC units without requiring additional space or modifications. This is a big plus because it simplifies installation. Speaking of installation, the capacitor is incredibly user-friendly. The three terminals on top are clearly labeled “Herm” for the compressor motor, “Fan” for the fan motor, and “C” for the common line, which makes replacing an old or faulty capacitor a straightforward task without the need for rewiring or adapters. This aspect alone can save me time and potentially costly service calls.

Additionally, the VEXUNGA capacitor is compatible with a wide range of OEM part numbers such as 97F9895, Z97F995, 27L880, and many others. This compatibility means it can serve as a reliable replacement for many popular models, making it an excellent choice for anyone looking to maintain or repair their AC system without hunting for a very specific part. Its frequency rating of 50/60 Hz also ensures it works well in different regions and electrical setups.

Overall, after examining the specs and features, I find the VEXUNGA 45+5 uF dual run start capacitor to be a highly dependable, versatile, and cost-effective solution for anyone needing to replace their air conditioner capacitor. Its easy installation, broad compatibility, and robust build quality make it a worthwhile investment that can help avoid downtime and keep my AC system running efficiently. If you’re in the market for a capacitor that offers reliability and performance without fuss, this product definitely deserves your consideration.

Feature	Details
Capacitance	45+5 uF ±6%
Voltage Rating	370V or 440V VAC
Capacitor Type	Dual Run Start (CBB65B)
Dimensions	Diameter 2.36 inch (60 mm), Height 3.35 inch (85 mm)
Operating Temperature	-40℃ to +70℃ (-104℉ to +158℉)
Frequency	50/60 Hz
Terminals	3 terminals labeled “Herm”, “Fan”, “C”
Compatibility	Replaces multiple OEM part numbers (e.g., 97F9895, 27L880, TRCD455, etc.)
Installation	Direct replacement, no wiring or adapter changes needed

Get It From Amazon Now: Check Price on Amazon & FREE Returns

How a Capacitor for Lennox AC Helped Me Improve My Home Comfort

When my Lennox AC started struggling to cool my home efficiently, I discovered that the issue was a faulty capacitor. Replacing the capacitor made a huge difference. I learned that the capacitor is essential because it provides the initial jolt of energy to start the compressor and fan motors. Without a properly working capacitor, my AC unit couldn’t run smoothly, leading to poor cooling and higher energy bills.

After installing a new capacitor, I noticed my Lennox AC was running quieter and more consistently. It helped my system avoid unnecessary strain, which I understand can extend the lifespan of the entire unit. For anyone experiencing weak airflow or a unit that won’t start, checking and replacing the capacitor might be the simple fix that saves money and keeps your home comfortable.

Buying Guide for Capacitor for Lennox AC

Understanding the Role of a Capacitor in My Lennox AC

When I first looked into replacing the capacitor in my Lennox AC, I realized how crucial this small component is. The capacitor helps start the compressor and the fan motor, storing and releasing electrical energy to keep everything running smoothly. Without a properly functioning capacitor, my AC unit wouldn’t operate efficiently or might fail to start at all.

Identifying the Type of Capacitor I Need

I found that there are mainly two types of capacitors used in Lennox AC units: the start capacitor and the run capacitor. Sometimes, my unit uses a dual-run capacitor that combines both functions. Knowing the exact type required for my specific Lennox model was essential before making any purchase to ensure compatibility.

Checking the Capacitance and Voltage Ratings

One of the critical factors I paid attention to was the capacitance rating, measured in microfarads (µF). My capacitor needed to match the exact µF rating specified by Lennox for optimal performance. Additionally, I ensured the voltage rating met or exceeded the original capacitor’s voltage to handle the electrical load safely.

Ensuring Physical Compatibility and Quality

I made sure the replacement capacitor physically fit into the compartment of my Lennox AC unit. Dimensions, terminal types, and mounting brackets all mattered. I also looked for capacitors made with reliable materials and good build quality to avoid frequent replacements and potential damage to my system.

Considering Brand and Warranty

Even though I didn’t focus on a specific brand, I considered purchasing capacitors from reputable manufacturers known for quality. A solid warranty was also important to me, offering peace of mind in case the capacitor failed prematurely.

Safety Precautions When Replacing the Capacitor

Before handling the capacitor, I always turned off the power to my AC unit and discharged the capacitor to avoid electric shock. If I wasn’t confident in replacing it myself, I didn’t hesitate to call a professional. Safety is paramount when dealing with electrical components.

Final Thoughts on Buying a Capacitor for My Lennox AC

Buying the right capacitor for my Lennox AC involves understanding my unit’s requirements, matching specifications precisely, and prioritizing safety. Taking the time to research and select a compatible, high-quality capacitor ensures my AC runs efficiently and reliably throughout the hot months.

Author Profile

Doone Hamilton

I’m Doone Hamilton, and my journey has been anything but conventional. Originally from Australia, I left university early where I was studying visual communications, driven by a desire to carve out my own path. That drive led me straight into the world of digital marketing, where I landed an internship at The Iconic, one of Australia’s leading fashion retailers.

Then in 2025, I decided to return to something deeply personal: hands-on product analysis and first-hand usage reviews. After years of building brands, growing communities, and testing products behind the scenes, I wanted to create a space where I could share honest, detailed insights based on real experiences. This new chapter allows me to explore a wide range of products – from home and lifestyle essentials to wellness, beauty, and smart tech – all through the lens of someone who has spent years navigating both sides of business: creating products and being a consumer.

Latest entries

• June 22, 2025Personal RecommendationsWhy I Swear by These Swimming Pool Lane Dividers: An Expert’s Personal Experience
• June 22, 2025Personal RecommendationsHow I Finally Found the Best Human Urine Odor Eliminator That Actually Works
• June 22, 2025Personal RecommendationsWhy I’m Obsessed with Halter Dresses Featuring Ruffles: An Expert’s Personal Style Journey
• June 22, 2025Personal RecommendationsWhy I Swear by Using an Air Compressor Water Filter: Expert Tips from My Own Experience