1 1

Michel & Siso are very knowledgeable and explain everything to where I could understand! Amazing experience! Thank you will always come here for any AC needs. Trustworthy and excellent customer service.

Celest G.

Verified Customer

4.9/5 based on 4750 reviews

Lennox 100335-51 (72W39) Genuine OEM Dual Run Capacitor 75/10 MFD 440 VAC Round

Name: Lennox 100335-51 (72W39) Genuine OEM Dual Run Capacitor 75/10 MFD 440 VAC Round
Brand: Lennox
SKU: 66255142677
Price: 49.99 USD
Availability: InStock

Low stock: 1 left

$49.99 USD

Sale Sold out

Shipping calculated at checkout.

Quick Details & Specs

Genuine Lennox 100335-51 (72W39) 75/10 MFD Dual Run Capacitor.
High-grade 440V rating for superior heat and surge protection.
Supports both the compressor and condenser fan motor.
Round oil-filled design with internal safety pressure interrupter.
Direct-fit OEM replacement for Lennox Signature and Elite units.

Please visit our store for pick up.

safe & secure Checkout

Fast & Tracked Delivery

30 Day money back guarantee

Specifications

Product Details and Key Specifications:

Part Number: 100335-51 (Catalog # 72W39)
Manufacturer: Lennox / Allied Air (Genuine OEM)
Part Type: Round Dual Run Capacitor
Capacitance: 75/10 MFD (75+10 µF)
Voltage: 440 VAC (Works for 370V applications)
Tolerance: +/- 5%
Shape: Round Canister
Shipping Weight: 1.45 lbs

description

Lennox 100335-51 (72W39) Genuine OEM Dual Run Capacitor 75/10 MFD 440 VAC Round

The Lennox 100335-51 (Catalog # 72W39) is a premium Genuine OEM Dual Run Capacitor designed for high-efficiency Lennox and Allied Air air conditioning and heat pump systems. This critical electrical component provides the necessary phase-shift and starting torque for both the compressor and the condenser fan motor, ensuring smooth startups and continuous, efficient operation of the outdoor unit.

Technical Performance:

Rated at 75 + 10 MFD (microfarads) and up to 440 VAC, this capacitor is engineered to handle the high-voltage demands of modern residential and commercial HVAC equipment. Being a Genuine OEM part, it features high-grade metallized polypropylene film and a non-PCB oil-filled interior for superior heat dissipation. This construction ensures the capacitor maintains its capacitance value under extreme summer temperatures, preventing the "motor humming" or "hard starting" issues common with low-quality, non-OEM universal alternatives.

Key Features and Function:

Dual-Purpose Operation: Simultaneously supports the compressor (75 MFD) and the fan motor (10 MFD) from a single compact canister.
Genuine OEM Reliability: Manufactured to Lennox’s exact electrical tolerances to prevent amperage spikes and extend the lifespan of the motors.
High-Voltage Versatility: Rated for 440V, allowing it to safely replace 370V capacitors while providing superior surge protection.
Safety Pressure Interrupter: Features an internal safety disconnect that removes the capacitor from the circuit if internal pressure builds, preventing the casing from rupturing.

Product Details and Key Specifications:

Part Number: 100335-51 (Catalog # 72W39)
Manufacturer: Lennox / Allied Air (Genuine OEM)
Part Type: Round Dual Run Capacitor
Capacitance: 75/10 MFD (75+10 µF)
Voltage: 440 VAC (Works for 370V applications)
Tolerance: +/- 5%
Shape: Round Canister
Shipping Weight: 1.45 lbs

🛠️ HVAC Depot Pro Tip: The "Mushroom" Check

When inspecting a system that isn't cooling, look at the top of the capacitor where the terminals are located. If the top is bulged or "mushroomed" upward, the internal safety interrupter has tripped and the capacitor must be replaced. Always use a discharge resistor or a shielded screwdriver to short the terminals before handling, as capacitors can hold a lethal electrical charge even when the power is disconnected.

Cross-Reference & Compatibility:

The 100335-51 is a direct OEM replacement for the following part numbers:

Lennox/Allied Numbers: 72W39, 100335-51, 10033551
Global/JARD Cross-Ref: 12793, 14293
Mars/Titan: 14293, 22293

Extensive Model Compatibility List:

XC Series: XC20-036, XC21-036, XC25-036
XP Series: XP20-036, XP21-036, XP25-036
Lennox Elite: EL16XC1, EL18XCV
Lennox Signature: SL18XC1, SL28XCV
Allied/Armstrong: 4SCU, 4SHP Series Units

Specification

Refund policy

Refund & Return Policy

Last Updated: June 2026

At HVAC Parts & Equipment Depot, customer satisfaction is important to us. This Refund & Return Policy explains how returns, exchanges, and refunds are handled for purchases made through TopHVACParts.com.

Return Eligibility

We accept returns within 30 days of delivery.

To qualify for a return:

The item must be unused, uninstalled, and in its original condition.
The item must be returned in its original packaging.
Model numbers and serial numbers must match the original purchase records.
Proof of purchase or order confirmation is required.

Non-Returnable Items

The following items are not eligible for return or refund:

Installed or used parts.
Products showing signs of installation, modification, or damage caused after delivery.
Items missing original packaging.
Sale or clearance items.
Special-order or custom-order products.
Returns requested more than 30 days after delivery.

Restocking Fee

Approved returns may be subject to a 20% restocking fee.

The restocking fee will be deducted from the refund amount after the returned item has been inspected and approved.

Damaged, Defective, or Incorrect Items

If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery.

Email: support@tophvacparts.com
Phone: (214) 734-5222

We may request photographs and additional information to help process your claim.

If the claim is approved, we will provide a replacement, exchange, or refund at no additional cost to you.

Exchanges

We replace items only if they are defective, damaged upon arrival, or incorrectly shipped.

To request an exchange, contact us at:

support@tophvacparts.com

Refund Process

Once your return is received and inspected, we will notify you by email regarding approval or rejection of your refund request.

If approved:

Refunds will be issued to the original payment method.
Processing typically takes 7–14 business days after approval.
Your financial institution may require additional time before the refund appears in your account.

Return Shipping

Customers are responsible for return shipping costs unless the return is the result of:

Our shipping error,
A defective product,
A damaged product received upon delivery.

Original shipping charges are non-refundable.

We recommend using a trackable shipping service and purchasing shipping insurance for higher-value items.

Return Address

HVAC Parts & Equipment Depot
1135 E Plano Parkway, Suite 8
Plano, TX 75074
United States

Professional Installation Notice

Many HVAC products require installation by a licensed HVAC professional.

HVAC Parts & Equipment Depot is not responsible for damages resulting from improper installation, misuse, unauthorized modifications, or failure to follow manufacturer instructions.

Special Orders

Special-order products must be picked up within 30 days of purchase unless other arrangements have been approved.

Unclaimed special-order products may be returned to the manufacturer and may be subject to applicable restocking fees.

Contact Us

If you have questions regarding returns, refunds, or exchanges, please contact us:

HVAC Parts & Equipment Depot

Phone: (214) 734-5222
Email: support@tophvacparts.com

Refund & Return Policy

Last Updated: June 2026

Return Eligibility

We accept returns within 30 days of delivery.

To qualify for a return:

The item must be unused, uninstalled, and in its original condition.
The item must be returned in its original packaging.
Model numbers and serial numbers must match the original purchase records.
Proof of purchase or order confirmation is required.

Non-Returnable Items

The following items are not eligible for return or refund:

Installed or used parts.
Products showing signs of installation, modification, or damage caused after delivery.
Items missing original packaging.
Sale or clearance items.
Special-order or custom-order products.
Returns requested more than 30 days after delivery.

Restocking Fee

Approved returns may be subject to a 20% restocking fee.

The restocking fee will be deducted from the refund amount after the returned item has been inspected and approved.

Damaged, Defective, or Incorrect Items

If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery.

Email: support@tophvacparts.com
Phone: (214) 734-5222

We may request photographs and additional information to help process your claim.

If the claim is approved, we will provide a replacement, exchange, or refund at no additional cost to you.

Exchanges

We replace items only if they are defective, damaged upon arrival, or incorrectly shipped.

To request an exchange, contact us at:

support@tophvacparts.com

Refund Process

Once your return is received and inspected, we will notify you by email regarding approval or rejection of your refund request.

If approved:

Refunds will be issued to the original payment method.
Processing typically takes 7–14 business days after approval.
Your financial institution may require additional time before the refund appears in your account.

Return Shipping

Customers are responsible for return shipping costs unless the return is the result of:

Our shipping error,
A defective product,
A damaged product received upon delivery.

Original shipping charges are non-refundable.

We recommend using a trackable shipping service and purchasing shipping insurance for higher-value items.

Return Address

HVAC Parts & Equipment Depot
1135 E Plano Parkway, Suite 8
Plano, TX 75074
United States

Professional Installation Notice

Many HVAC products require installation by a licensed HVAC professional.

HVAC Parts & Equipment Depot is not responsible for damages resulting from improper installation, misuse, unauthorized modifications, or failure to follow manufacturer instructions.

Special Orders

Special-order products must be picked up within 30 days of purchase unless other arrangements have been approved.

Unclaimed special-order products may be returned to the manufacturer and may be subject to applicable restocking fees.

Contact Us

If you have questions regarding returns, refunds, or exchanges, please contact us:

HVAC Parts & Equipment Depot

Phone: (214) 734-5222
Email: support@tophvacparts.com

View full details

Shop By Brands

Happy Shouts From Our Thrilled Customers

William Bartlett

Cecil really saved me with troubleshooting tips over the phone. Thought I was going to have to replace the blower motor and ended up only needing a motor run capcitor. Thank you and God bless!

Verified Buyer

Riley Connolly

Cecil and Fidel were absolutely amazing and so helpful. We were happy they were open on Sunday, but was impressed with their knowledge and willingness to make sure we had everything we needed. If you need parts or service or install, I would recommend.

Verified Buyer

Cole Meger

Our AC went out during the hottest stretch of summer, and with a one-year-old at home, we were desperate for a quick fix. These guys came through big time — not only did they source the part faster than anyone else in the area, they also walked me through DIY troubleshooting while I waited. Trustworthy, knowledgeable, and run by a solid local family. As someone who owns rental properties nearby, I’ll be sourcing all my HVAC parts from them moving forward. Highly recommend!

Verified Buyer

Carl T. Droste

Had a power outage last night and during the 100 degree heat today noticed that the AC was not blowing any cold air. Pulled the capacitors to have them checked and also took video of the relay making noise even with the breaker was off. The proprietor and her staff were very friendly and helpful. She had the video analyzed and confirmed something was wrong. She checked one of the capacitors was a little low. Capacitor replacement is the biggest ticket item for HVAC repair. It is hundreds of dollars with the a capacitor only about $20.

Verified Buyer

Fuzzy Wuzzy

Cecil and his family have been a life saver. I walked in with very little knowledge on parts let alone how to repair my unit. All I had was my brother in FL who knows more than I do and Cecil at HVAC Depot. With 2 young kids at home I couldn't afford to wait for a HVAC tech. Cecil walked me through what I needed to know, even after hours when the shop closed. I successfully repaired the fan motor and replaced the capacitor. Thank you HVAC team for being totally awesome. Prices were amazing and I'm forever going to support this small family business. You and your family are what Texas is all about!!!

Verified Buyer

Linda Robinson

I called HVAC Depot and was absolutely blown away by the fast, courteous and exceptional service. They were very knowledgeable about explaining what they were doing and what had happened to the ac system. If you ever need a HVAC team they are best and they won’t hesitate by coming out and they won’t leave until you are happy with the service. Thank you so much for your excellent service. Kudos to you Michelle for your amazing customer service.

Verified Buyer

Paul Hamer

My AC went out in our home on Friday night. I went out and got the capacitor details and took them here first thing Saturday morning. Lady at the counter was friendly and had the capacitor I needed! When I got home, I installed the capacitor and AC is all good!!

Verified Buyer

Jeff Ledesma

Awesome support and had everything I needed for an older unit! Then helped me out with the DIY!! Air conditioning back up and running at 100%!!
Thanks for everything

Verified Buyer

HVAC Parts and Equipment Depot

HvaC parts Click here

HvaC Equipment Click here

Frequently Asked Questions

Questions? We’ve got you covered

Can anyone buy from your store, or do I need to be a licensed contractor?

We are open to the public! Homeowners, landlords, and DIYers are all welcome—no license required.

What kinds of HVAC parts do you sell?

We carry blower motors, fan motors, capacitors, control boards, contactors, thermostats, filters, copper lines, refrigerants, and more.

Do you sell parts for specific brands like Trane, Goodman, or Lennox?

Yes, we stock OEM and compatible replacement parts for major brands including Trane, Goodman, Lennox, Carrier, Rheem, and others.

Can you help me find the right part for my system?

Absolutely! Bring in the part, model number, or a picture, and our team will help match you with the correct replacement.

Do you offer returns or exchanges on parts?

Yes, we accept returns or exchanges within a set time period—just make sure the item is unused and in original packaging. Ask for specific terms at the counter.

Do you provide technical support or installation services?

While we don't install, we can answer basic questions and refer you to trusted local HVAC technicians if needed.

Do you sell refrigerants to the public?

We sell certain refrigerants, but EPA regulations require certification for purchase of products like R-410A or R-22.

Do you ship parts, or is it in-store only?

We offer both! You can shop in person or call to arrange shipping if you're out of town.

Lennox 100335-51 (72W39) Genuine OEM Dual Run Capacitor 75/10 MFD 440 VAC Round