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Open Hours: Mon-Fri: 7 AM - 6 PM Sat: 7 AM - 3 PM Sun: Closed

The Essential Spot to Air Conditioner Capacitors: Understanding Their Function

Air conditioning capacitors are essential components in HVAC systems, particularly air conditioning units. They are electrical devices that store and release electrical energy through capacitance. Capacitors play a crucial role in operating the system's motors and compressors.


Capacitors: How they work and why they are essential

Difference in capacitors

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Start Capacitors:

These capacitors provide an extra electrical boost to the compressor motor when the air conditioner starts. This additional power helps the motor overcome the initial resistance and rotate properly. Once the motor is running, the start capacitor is disconnected from the circuit.

Run Capacitors:

Run capacitors are continuously connected to the motor circuit to help maintain a steady electrical phase, ensuring the motor runs efficiently and maintains a consistent speed. They assist in improving the overall power factor of the system.

Importance of Efficiency

Efficient and consistent operation is essential for HVAC systems, such as air conditioners, to deliver the desired cooling or heating. Capacitors are crucial in ensuring this efficiency. When a capacitor becomes faulty or starts to fail, it can cause various problems. One of these issues is reduced cooling or heating, as the compressor motor may run sporadically or face difficulties in starting, leading to a decrease in the system's capacity to cool or heat effectively.

The need for knowing what capacitors do

Higher Energy Consumption:

If capacitors are not working properly, motors might increase their current intake to make up for the insufficient starting power or phase shifting. Consequently, this can result in higher energy consumption and increased utility expenses. Additionally, the added stress on the motor due to a defective capacitor can cause overheating, which can potentially harm not only the motor but also other components within the HVAC system.

The malfunction of a capacitor can result in the compressor motor ceasing to function, which may ultimately lead to a total system failure and discomfort for those occupying the space in severe situations.

System Breakdown:

Regular maintenance

It is essential to perform checks and replacements on capacitors as necessary to guarantee the HVAC system runs smoothly and optimally. Testing capacitors aids in detecting any potential problems before they cause major system failures. To ensure safety and proper functioning, it is advisable to have a skilled HVAC technician conduct these inspections and replacements. To obtain the most precise and current information about Hartzell's Heat and Air's inventory and services, I suggest directly contacting the company or visiting their official website.

At Hartzell's Heat and Air

... enjoy the endless possibilities

We provide convenient in-office testing services for homeowners who are considering capacitor replacement or seeking assessments. Our goal is to offer a seamless experience for our customers. We understand the importance of maintaining a well-functioning HVAC system.

Skilled Technicians

Our office is equipped with skilled technicians who can conduct comprehensive testing on capacitors. If you are facing issues with the efficiency of your HVAC system or suspect that a capacitor is causing problems, we are able to assist in diagnosing the situation.


HVAC You Can Trust

At Hartzell's Heat and Air, we prioritize your HVAC system's performance and your peace of mind. Our meticulous testing process is designed to accurately identify potential issues, enabling you to make informed decisions. With your comfort in focus, we maintain a variety of commonly required capacitors in stock, including air conditioner run capacitors. This proactive approach simplifies the process, ensuring that if testing indicates an HVAC capacitor replacement is needed, we likely have the specific one you require on hand. This not only streamlines the procedure but also guarantees your HVAC system's swift restoration to smooth operation. Count on us for reliable expertise, from HVAC capacitor troubleshooting to DIY replacement. Experience the difference of working with a team that values your comfort and the efficiency of your HVAC system. Trust Hartzell's Heat and Air to keep your home comfortable year-round.

Wanna Know More Information?

A functional HVAC system is vital for comfort. Inadequate capacitors impact performance, leading to ineffective cooling/heating and energy waste. Our testing and accessible replacements guarantee optimal HVAC function. From HVAC capacitor troubleshooting to replacement, count on us for comfort.


If you're in need of capacitor testing, replacement, or any HVAC-related services, feel free to reach out to us at Hartzell's Heat and Air. Our knowledgeable team is here to assist you and help keep your home's comfort in top condition.

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