Buying A New Capacitor For Your Air Conditioner

It is not unusual for an air conditioner to have a bad start capacitor. The solution in such condition is quite simple – you have to replace it. The question is how to buy a new capacitor? How to know its size? There are few things that you should consider when shopping for a new capacitor. The most important are micro-farads (μF) and the voltage rating. The shape and size of the capacitor are not as crucial as these. A capacitor with little variation from the required size will still be able to render the needed job. If the shape is little different from what is required, the mounting bracket will flex itself a bit to accommodate the new capacitor. But the micro-farad number has to match exactly. In fact, the voltage rating can be slightly higher than the current one.

When you shop for a new capacitor, mark the μF and voltage marked on your capacitor. If it is not marked with these data, note down the model number of your A/c. Produce it at the shop from where you will buy the capacitor. They will give you the appropriate one. The brand of a capacitor is not an important factor. It’s a universal part.

Size, if not that important should not be ignored completely at the same time. An over or under-sized capacitor can lead to an imbalance in the magnetic field of the motor. The unit will become noisy. The operational cost of the system will increase. The moto will not be able to perform efficiently. The equation below will give the exact size.


Capacitors that have a micro farad rating of more than 70uf are known as Start Capacitors. The voltage of a capacitor is usually at least 370VAC. The new air conditioners come with capacitors of 440VAC capacitors. These are more long-lasting and can withstand fluctuations in power supply.

The cost of an A/c capacitor would range between $10-100. It will vary with brand and model and if single or dual-voltage.





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