While your air conditioner might appear to be quite a simple system on the surface, there are a number of electrical components that collaborate each time your air conditioner starts and operates. As an important component, the size of the capacitor is quite small, but it can have a major impact on your cooling system.
It might be time for an AC capacitor replacement, but that is something a technician would be able to let you know after inspection. Sometimes, you can mistake other issues for a quick fix or a change of capacitor, but that is something you should always get checked to avoid further damage and ruining your HVAC system. That is why it is important to do the proper diagnosis before replacing any part.
This quick guide will discuss what an AC capacitor is, the most common AC compressor failure signs, and the factors that can influence the total cost of the capacitor.
What Does An AC Capacitor Do?
The AC capacitor is a key electrical component in your HVAC system that assists in delivering electrical energy to some of the motors needed to power your air conditioning system.
The capacitor aids the motor in starting up and running efficiently. When it is weak or fails altogether, the AC may not start or operate normally.
Imagine it as a piece that provides the motor with electric power when it is required.
What Is The Cost Of AC Capacitor Replacement?
The capacitor cost can be between $100-$400, but there are a number of factors that can increase it based on the damage and scope of work.
Other than that, the costs may vary depending on the type and size of the capacitor, the type of AC system, labor costs, accessibility, and service call fees, as well as local market conditions.
A simple capacitor replacement may be quite simple, but a service call could include diagnosis along with other electrical repairs or other failed components in the process, and the price could be higher.
Start Capacitor vs. Run Capacitor
Although both are capacitors, they don't necessarily serve exactly the same purpose.
A start capacitor boosts the electrical flow to aid in the starting of a motor. However, a run capacitor can assist a motor to run efficiently once it has been started.
Some air conditioning systems utilize their own capacitors, while others have a dual capacitor that services several components.
| Component | Main Purpose | What a Problem May Cause |
| Start capacitor | Helps a motor start | Motor struggles or fails to start |
| Run capacitor | Supports motor operation | Weak performance or motor problems |
| Dual capacitor | Supports multiple motors | Outdoor unit may develop several symptoms |
| Hard start kit | Provides additional starting assistance | May help certain systems with difficult starts |
What Are The Signs Of A Bad AC Capacitor
There are some common signs, which include:
- AC struggles to start
- Compressor humming sound
- System turns on and off randomly
- The cooling performance is not steady.
- The AC is taking time to start
- Outdoor fan is not working correctly
- The system trips a breaker repeatedly
Although the capacitor is one of the most critical HVAC electrical components, there are still other factors that can cause the above issues.
What Happens When An AC Capacitor Fails?
A broken capacitor can cause the motor to have trouble starting up or running properly.
You may find that your AC:
- Runs inconsistently
- Doesn't cool the house properly
- Makes unusual noises
- Takes longer to start
- Shuts down unexpectedly
- Fails to start altogether
Conclusion
When a capacitor is weak or fails, a variety of AC issues can occur, including humming, struggling to start, inadequate cooling, and even total system failure. Although AC capacitor replacement can be a simple HVAC fix, it is crucial to correctly diagnose the issue to begin with.
AAA Modern Air is able to diagnose air conditioning issues and determine whether or not it requires a capacitor replacement or another type of repair. A professional test will help to determine the real cause of the issue and thus help you to make a proper decision about your AC system. Get in touch with us today, and we will do a thorough HVAC check with guaranteed solutions.
FAQs
How do you test a capacitor on an air conditioner?
A meter that can measure capacitance can be used by an HVAC technician to compare the measured capacitance against the capacitor's rated specification. The test should only be conducted by a person who is knowledgeable about working safely with electrical components associated with HVAC equipment, since capacitors can store electrical energy.
What is the cost of AC capacitor replacement?
This depends on the type of capacitor, system, labor, diagnostic work, and if further repairs are required. It's usually between $100 and $400, depending on the scope of work.
Can a bad capacitor cause an AC to stop working?
Yes. When the capacitor has completely failed, the motor or compressor that it supports may not start up correctly. This can make the AC unable to cool down your house.
