Choosing the right capacitor is essential for reliable HVAC performance. This guide highlights five top-rated dual run capacitors that suit most residential air conditioning units, consolidating key specs, compatibility notes, and installation considerations to help American homeowners and technicians select confidently.
| Product | Capacitance (uF) | Voltage | Type | Approx. Size | Brand |
|---|---|---|---|---|---|
| BOJACK 35+5uF | 35/5 | 370/440 VAC | CBB65 Dual Run | ~Diameter 1.97 in; Height 4.14 in | BOJACK |
| VEXUNGA 45/5 uF | 45/5 | 370/440 VAC | CBB65 Dual Run | Diameter 2.36 in; Height 3.35 in | VEXUNGA |
| BOJACK 45+5 uF | 45/5 | 370/440 VAC | CBB65 Dual Run | Diameter 2.56 in; Height 3.74 in | BOJACK |
| QYCKFIXR 45+5 uF | 45/5 | 370/440 VAC | CBB65 Dual Run | Standard round, compact | QYCKFIXR |
| BOJACK 40+5 uF | 40/5 | 370/440 VAC | CBB65 Dual Run | Diameter ~2.48 in; Height ~3.55 in | BOJACK |
BOJACK 35+5uF Dual Run Capacitor
BOJACK 35+5uF ±6% 370V/440V CBB65 dual run circular start capacitor. Designed for AC motors, fans, or condenser units. Key specs include a capacitance of 35/5 MFD, operating temperature from -40°C to +70°C (-104°F to +158°F), and a compact, circular form factor. This unit is suitable for a wide range of standard residential HVAC configurations and emphasizes reliable performance under typical service conditions.
VEXUNGA 45/5 uF Dual Run Capacitor
VEXUNGA 45+5 uF ±6% 370/440 VAC CBB65 dual run capacitor. This model covers both 370V and 440V systems, offering a robust 45/5 MFD range with a compact profile (approximately 2.36 inches diameter by 3.35 inches height). Operating temperature tolerance mirrors common HVAC conditions, enabling dependable fan and compressor operation across seasons.
BOJACK 45+5 uF Dual Run Capacitor
BOJACK 45+5 uF ±6% 370V/440VAC CBB65 dual run capacitor, with dimensions of approximately 2.56 inches in diameter and 3.74 inches in height. It is designed for reliable start and run performance in air conditioners, condensers, and heat pumps, and is rated for high AFC safety, providing sturdy operation under demanding conditions.
QYCKFIXR 45/5 uF Dual Run Capacitor
QYCKFIXR AC Capacitor 45+5 uF (45/5 MFD) 370/440 VAC dual run, engineered to replace both 370 VAC and 440 VAC capacitors. It includes a ten-year coverage commitment and aligns with stringent USA standards for AC motor run capacitors, including EIA-456-A and IEC 60252-1:2001. It provides a reliable, long-lasting option for a range of HVAC setups.
BOJACK 40+5 uF Dual Run Capacitor
BOJACK 40+5 uF ±6% 370V/440V CBB65 dual run capacitor, with a diameter of about 2.48 inches and a height of 3.55 inches. This unit is designed for broad compatibility with standard AC motors and condensers, providing dependable start and operation across common HVAC configurations and climates.
BOJACK 70+5 uF Dual Run Capacitor
BOJACK 70+5 uF ±6% 370V/440V CBB65 dual run capacitor. Large-capacitance option for higher-demand HVAC systems such as heat pumps or larger condenser units. Features a compact yet robust build with a diameter around 2.56 inches and a height near 4.92 inches, suitable for a wide range of installations and climate conditions.
VEXUNGA 35/5 uF Dual Run Capacitor
VEXUNGA 35+5 uF ±6% 370/440 VAC CBB65 dual run capacitor. Suited for smaller to mid-size AC units, this capacitor provides a balanced 35/5 MFD with a diameter of about 1.97 inches and a 3.35-inch height profile, delivering reliable performance within typical residential HVAC systems and weather conditions.
Powswopx 2 Pack 35+5 uF
Powswopx 2 Pack 35+5 MFD 35/5 uF 370 or 440 Volt CBB65B dual run circular start capacitor. Each unit matches standard 35/5 MFD ratings with a compact form factor (diameter 1.97 inches, height 4.16 inches). Rated for -40°C to +70°C, this pack offers a cost-effective upgrade or replacement option for HVAC systems and heat pumps, with compatibility across common model families.
Buying Guide: Key Purchase Considerations
- Voltage compatibility: Ensure the capacitor supports both 370V and 440V variants if your unit can operate on either supply. Dual-run designs commonly list 370/440 VAC ratings.
- Capacitance rating: Match the original MFD value and the split (e.g., 35/5, 45/5, 40/5) to avoid mismatched starting torque or inefficient running.
- Physical size and mounting: Check diameter and height against your enclosure and mounting brackets. Some units offer compact footprints for tight spaces.
- Tolerance and temperature range: Look for ±6% tolerance and operation from -40°C to +70°C (-104°F to +158°F) to ensure reliability across seasons.
- Build standards: Prefer capacitors built to industry standards (CBB65, EIA-456-A, IEC 60252-1) for safety and longevity. Safety ratings like AFC can indicate robustness in high-demand applications.
- Warranty and support: A long warranty or clear after-sales support can reduce risk, especially for critical HVAC components.
- Replacement guidance: When replacing, ensure the new capacitor matches both the run and start values and that wire leads and terminals align with existing connections.
- Pack options: For preservation of inventory or multi-unit service, consider multi-pack offerings if available, ensuring you have spare units on hand without overstocking.
When selecting a capacitor, cross-check your unit’s label or service manual for the exact capacitance value, voltage rating, and terminal configuration. If in doubt, consult a licensed HVAC technician to avoid incorrect replacements that could affect compressor start-up or motor performance.