Supco Run Capacitor 45+5 MFD
Quality dual-run capacitor with consistent ratings.
$12 - $20
Check Price on Amazon →Quick Specs
- Brand
- Supco
- Category
- capacitors
- Price Range
- $12 - $20
- ASIN
- B01M05L7B3
Overview
A 45+5 microfarad dual-run capacitor from Supco, one of the most common ratings used in residential HVAC systems. Capacitors store electrical charge to help motors start and run efficiently. When they fail, symptoms include hard starting, humming from the condenser, or motors that spin slowly. The 45+5 MFD rating covers the compressor start and fan motor circuits on many residential AC units and heat pumps.
Pros
- ✓ 45+5 MFD is the most common residential HVAC capacitor rating
- ✓ Supco is a trusted brand in HVAC replacement parts
- ✓ Microfarad rating printed clearly on the side for easy verification
- ✓ Includes safety discharge resistor for reduced shock risk
Cons
- ✗ Non-branded capacitors can work just as well at half the price
- ✗ Dual-run caps are specific to your unit's MFD rating — verify before buying
- ✗ Tolerance variance between manufacturing batches
Who It's For
Homeowners whose AC or heat pump capacitor tested outside the ±6% tolerance range. Easy DIY replacement — one wire at a time, take a picture first, and discharge with a screwdriver before touching terminals.
Who Should Skip This
If your capacitor is within 6% of its rated MFD, it's still good. Check the rating with a multimeter before replacing. Also skip if the symptoms match a bad contactor or motor — capacitor failure gets blamed for everything.
Compatibility
Most residential AC units and heat pumps requiring 45+5 MFD dual-run capacitor
Related Repair Guide
This part is referenced in our main repair guide:
View the full diagnostic guide on errorcodefixes.com →Bottom Line
The 45+5 MFD dual-run capacitor is the most commonly needed HVAC capacitor. Supco's quality is consistent and the price is right. Keep one in your parts bin — they fail most often in summer heat and having a spare saves a service call.
Affiliate Disclosure: ErrorCodeFixes Reviews is a participant in the Amazon Services LLC Associates Program. We earn a commission on qualifying purchases made through our links. All reviews are based on manufacturer specifications, compatibility data, and research — not hands-on testing. Always verify compatibility with your specific equipment before purchasing.