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What Is an Air Conditioner Hard Start Kit? A Phoenix Tech Explains.

A hard start kit is an energy-storing capacitor that helps your AC start when it’s struggling to turn on.

As their name suggests, hard start kits help solve a problem called hard starting, which is when an AC struggles to turn on and then shuts off abruptly after a short while.

If you hear a stutter or clicking noise when you turn on your AC, and your AC doesn’t stay on for long, then those are signs your air conditioner is hard starting.

Contact a Phoenix AC professional if your air conditioner/heat pump is hard starting. It could cause serious damage to your cooling system, so you should get it fixed ASAP.

In this article, we’ll answer these 2 questions:

Let’s start with question #1...

Want to skip the hassle of troubleshooting and have a trained tech repair your AC? We can help!

What does a hard start kit do?

Here’s the bottom line: A hard start kit makes your AC start smoothly and quickly, which reduces damage to AC parts and prolongs the life of your cooling system.

But why does an AC have a hard time starting up in the first place?

Well, when you turn on your AC, its compressor (the “heart”) powers on to help the system cool your home. However, starting up the compressor requires 4–8 times more electric current than running it.

That’s a lot of electrical juice!

Over time, this jolt of power, which creates a surge of heat, can damage the compressor and other important AC components—especially if your compressor is already old and worn out. And if your compressor is already worn out, it requires even more electricity to get it to shift from “start” to “run” mode.

That’s when a hard start kit saves the day: A hard start kit shortens the startup period of the compressor and reduces the amount of electricity it takes to start your AC.

In fact, with a hard start kit, the electrical efficiency of the startup process is as high as 98%, compared to an efficiency of only 50% without one. This efficiency reduces heat and wear on the compressor and other important AC components.

OK, so you know a hard start kit helps your AC compressor turn on. But do YOU need a hard start kit?

Do I need a hard start kit?

You should consider installing a hard start kit if you find yourself in one of these scenarios:

Scenario #1: Your AC is already hard starting

If your air conditioner is already hard starting, you should contact a professional ASAP to investigate the problem.

“How do I know if my AC is hard starting?”

You’ll know if you notice these 4 signs:

  1. AC starts, then quickly shuts off after you turn it on: This is called short-cycling, and it means there’s something wrong with your compressor.
  2. You hear clicking noises when the compressor starts: A clicking sound points to a problem with your compressor, which is using too much power to turn on (hard starting).
  3. Your compressor trips your circuit breaker: This means your air conditioner is using too much energy to start, so your circuit breaker trips before any serious electrical damage occurs. This is a symptom of hard starting.
  4. Your lights flicker when you turn your AC on: This is normal to a certain extent, but if you notice a dramatic flicker then it means your AC is drawing too much power to start, which is a symptom of hard starting.

Solution: Contact a professional to investigate the problem. If your compressor motor is struggling to turn on, then a hard start kit could potentially solve the issue.

However, if your compressor is near the end of its life, then a hard start kit may prolong its life for a short time, but shouldn’t be viewed as a long-term fix. If your compressor is about to die, talk with your technician about replacing your AC system (it’s usually more cost-effective to replace your whole system rather than buy an expensive compressor).

Scenario #2: You have a new air conditioner

In the past, most single-phase ACs came from the manufacturer with built-in hard start devices, but many newer AC models don’t include a hard start kit.

If your air conditioner doesn’t have a built-in hard start kit (your technician will let you know), you should consider having an AC professional install one. If your compressor is new and in good shape, a hard start kit could extend its life and help it start even in difficult conditions like low voltage or high head pressure.

Need a hard start kit for your AC or heat pump?

Contact George Brazil to schedule an AC repair. We’ll send one of our trusted technicians to visit your home and install a hard start kit for your air conditioner.

We’ve been serving Phoenix families since 1955.