What MFD capacitor do I need for my Lennox AC?

The correct replacement for Lennox model OEM Lennox Run Capacitor 35 MFD 440V Round — 19H97 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 35 MFD 440V Round — 19H97.

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 35 MFD 440V Round — 19H97

Name: OEM Lennox Run Capacitor 35 MFD 440V Round — 19H97
Brand: Lennox
SKU: LNX-19H97
Price: 18.95 USD
Availability: InStock

SKU: LNX-19H97 Brand: Lennox

$18.95 $24.95

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The genuine OEM Lennox 19H97 is a 35 MFD, 440-volt round run capacitor (Firstchoice brand) that provides the steady phase-shifted current your compressor or condenser fan motor needs to run efficiently. Rated at 35 microfarads, it delivers the precise stored charge Lennox specified for your unit, keeping motor torque high, amperage low, and operating temperatures in check throughout every cooling cycle.

A failing run capacitor rarely fails quietly. Common symptoms include a motor that hums but won't spin, an outdoor fan that spins slowly or stalls, hard starting, breaker trips, weak airflow, and rising electric bills. A swollen or leaking capacitor case confirms the part has degraded and should be swapped immediately to protect the motor it drives.

OEM matters here: a 440V-rated capacitor with the correct 35 MFD value ensures your Lennox motor receives exactly the load it was engineered for. Generic capacitors with loose tolerances can cause overheating, premature motor failure, and warranty issues. The 19H97 is built to factory specification for a guaranteed fit and rated efficiency. In stock and ships same day.

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 35 MFD ...

$18.95

Frequently Asked Questions

Does this Capacitor fit my Lennox OEM Lennox Run Capacitor 35 MFD 440V Round — 19H97?

Yes. This is the factory-specified OEM capacitor for the Lennox OEM Lennox Run Capacitor 35 MFD 440V Round — 19H97. 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 35 MFD 440V Round — 19H97?

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 35 MFD 440V Round — 19H97

Shipping Information

Return Policy

Frequently Asked Questions