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Comparing Single Run Capacitors: MFD, VAC, and Price

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The run capacitor is one of the most important parts of your HVAC system. As we have discussed in a past post, a faulty run capacitor requires an immediate replacement. In furnaces, air conditioners, and heat pumps, the run capacitor holds the electrical charge that powers the fan motor, so a broken run capacitor renders your system useless.

When browsing the options for new single run capacitors, you will see that different products vary in three ways: the value of the MFD, the value of the VAC, and the price. Typically, the price depends on the previous two factors. Read on to learn more about these three variables so that you can choose the right single run capacitor for your system.

Understanding MFD: What Does It Mean?

The MFD for single run capacitors on the market today can range from as low as 5 MFD to as high as 80 MFD. MFD stands for “Microfarads,” and it is a measure of the unit’s capacitance -- that is, the amount of charge that the capacitor can store when a particular voltage is applied. Single run capacitors with higher MFD values have greater capabilities, so they can support larger heating and cooling systems. This explains why the price of a single run capacitor tends to increase with MFD value. When you choose the right MFD capacitor for your system, it ensures that the motor RPM and the motor torque are ideal for your system, ensuring its effectiveness and efficiency.

VAC Value: 370 or 440?

The other value that you confront when choosing between single run capacitors is the VAC value. VAC stands for “Volts Alternating Current,” and it indicates the supply voltage for which the unit is rated. Depending on your system, you need a run capacitor with either 370 VAC or 440 VAC. Again, because single run capacitors with 440 VAC support larger, more capable HVAC systems, they tend to be priced slightly higher -- but it’s worth a few more dollars if you are replacing a run capacitor with 440 VAC. Otherwise, the voltage applied will be too high for the capacitor to withstand, so it could fail without warning.

Direct Price Comparisons

To get a better idea of what you can expect to pay for single run capacitors with different MFD and VAC values, here are are a few direct price comparisons:

370 VAC                                 440 VAC

7.5 MFD: $23.25                   $24.75

15 MFD $28.58                     $30.08

25 MFD $38.14                     $39.65

40 MFD $52.79                     $54.29

55 MFD $66.83                     $68.34

70 MFD $76.19                     $77.70


If you are looking to replace your single run capacitor, National Air Warehouse offers a wide range of options. Contact us today to learn more about our products!

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