What MFD capacitor do I need for my Goodman AC?

The correct replacement for Goodman model GMT070-4B — B945672 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 Goodman equipment which lists the model number GMT070-4B — B945672.

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.

Is this capacitor compatible with Bryant or Payne systems too?

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

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Goodman

OEM Goodman 12.5 MFD 370V Run Capacitor for GMT070-4B — B945672

Name: OEM Goodman 12.5 MFD 370V Run Capacitor for GMT070-4B — B945672
Brand: Goodman
SKU: GOODMAN-12345
Price: 17.95 USD
Availability: InStock

SKU: GOODMAN-12345 Brand: Goodman

$17.95 $24.95

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Goodman B945672 Run Capacitor — 12.5 MFD / 370V

The genuine Goodman B945672 run capacitor is a direct-fit replacement engineered for the Goodman GMT070-4B furnace and compatible units. This capacitor delivers the steady phase-shifted current that keeps your blower or condenser motor running efficiently. A weak or failed capacitor is one of the most common causes of a motor that hums but won't start, overheats, or short-cycles — replacing it restores full performance for a fraction of a service call.

Specifications

Capacitance: 12.5 MFD (microfarads)
Voltage Rating: 370V
Type: Round run capacitor
Fits: Goodman GMT070-4B and compatible furnaces
OEM Part Number: B945672

OEM vs. Generic

Our genuine OEM Goodman B945672 is built to exact factory tolerances for reliable capacitance and long service life. Budget generic capacitors often drift out of spec early, causing repeat motor strain. For a component this critical to motor health, OEM is the smart choice.

Installation Difficulty

Easy (1/5). A 10–15 minute swap for most homeowners. Always cut power at the disconnect and safely discharge the old capacitor before touching the terminals. Photograph the wiring before removal so the new cap goes back exactly as it came out.

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 Goodman 12.5 MFD 370V Run Ca...

$17.95

Frequently Asked Questions

Does this Capacitor fit my Goodman GMT070-4B — B945672?

Yes. This is the factory-specified OEM capacitor for the Goodman GMT070-4B — B945672. 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 Goodman GMT070-4B — B945672?

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 Goodman 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 Goodman 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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