What MFD capacitor do I need for my Lennox AC?

The correct replacement for Lennox model OEM Lennox Run Capacitor 45 MFD 370V Oval — 22P05 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Lennox equipment which lists the model number OEM Lennox Run Capacitor 45 MFD 370V Oval — 22P05.

My AC hums but will not start. What part do I need?

An AC that hums but will not start is the classic symptom of a failed capacitor. The capacitor provides the electrical boost needed to start the compressor and fan motors. When it fails, you hear the hum of the motor trying to start but it cannot overcome inertia. Other symptoms include the fan spinning slowly, the AC cycling on and off rapidly, or a visibly swollen or leaking capacitor. Replacement cost: $15 to $80 for the part, DIY in 30 minutes.

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Lennox

OEM Lennox Run Capacitor 45 MFD 370V Oval — 22P05

Name: OEM Lennox Run Capacitor 45 MFD 370V Oval — 22P05
Brand: Lennox
SKU: LNX-22P05
Price: 18.95 USD
Availability: InStock

SKU: LNX-22P05 Brand: Lennox

$18.95 $24.95

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The genuine OEM Lennox 22P05 is a 45 MFD, 370V oval run capacitor engineered to deliver the precise electrical phase shift your compressor and condenser fan motor need to run smoothly and efficiently. Rated to exact factory specifications, it maintains steady torque and reduces amperage draw, protecting the motor windings over the long life of your Lennox system.

Run capacitors are one of the most common failure points in HVAC equipment. When the 22P05 weakens or fails, you may notice the outdoor unit humming but not starting, the compressor or fan struggling to spin up, frequent breaker trips, warm air from the vents, or a visibly bulging or leaking capacitor top. Because it degrades gradually, replacing it at the first sign of trouble prevents a burned-out motor.

Choosing an OEM part matters. Lennox equipment is calibrated for the exact capacitance and voltage tolerance of the 22P05, and off-brand substitutes can drift out of spec, shorten motor life, or void warranty coverage. This factory-matched replacement ensures correct fit, rated performance, and lasting reliability.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Lennox Run Capacitor 45 MFD ...

$18.95

Frequently Asked Questions

Does this Capacitor fit my Lennox OEM Lennox Run Capacitor 45 MFD 370V Oval — 22P05?

Yes. This is the factory-specified OEM capacitor for the Lennox OEM Lennox Run Capacitor 45 MFD 370V Oval — 22P05. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the capacitor on my Lennox OEM Lennox Run Capacitor 45 MFD 370V Oval — 22P05?

Difficulty: Easy (20–30 min)
Step 1: Turn off power at breaker. Step 2: Open condensing unit panel. Step 3: Photograph the old capacitor wiring (Common/Herm/Fan). Step 4: Discharge old capacitor with insulated screwdriver. Step 5: Disconnect and remove old capacitor. Step 6: Mount new capacitor, reconnect wires to matching terminals. Step 7: Close panel, restore power, test. Tools: screwdriver, needle-nose pliers.

My AC hums but won’t start. What part do I need?

An AC that hums but won’t start is the classic symptom of a failed capacitor. The capacitor provides the electrical boost to start the compressor. When it fails, you hear humming but the motor can’t overcome inertia. Other symptoms: fan spinning slowly, AC cycling on/off rapidly, or a visibly swollen capacitor. Fix: replace capacitor ($15–$80 DIY, 30 min).

Is this capacitor compatible with Bryant or Payne too?

Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Lennox capacitor?

OEM strongly recommended. OEM capacitors have ±6% MFD tolerance vs aftermarket ±10%. The looser tolerance causes motor winding stress, higher temps, and shorter compressor life. Price difference is only $10–$20 — OEM is the clear value choice.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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OEM Lennox Run Capacitor 45 MFD 370V Oval — 22P05

Shipping Information

Return Policy

Frequently Asked Questions