What Is an AC Hard Start Kit — and Do You Need One?

Have you ever had that moment when you flip on your air conditioner and instead of the smooth hum of cool air salvation, you hear a strained groan followed by ... nothing? It's like your AC is desperately trying to wake up but failing miserably. There's actually a solution for that sluggish start-up, and it's called an AC hard start kit.

This May Also Interest You: 10 Ways to Make Your Central Air Conditioner More Efficient

This device might be exactly what your struggling air conditioner needs to get its act together. Let's dive into everything you need to know about these helpful little devices.

What Is the Purpose of an AC Hard Start Kit?

An AC hard start kit is essentially a small electrical device that gives your air conditioner's compressor an extra jolt of power during start-up. It matters because your air conditioner's compressor requires a significant amount of electrical current — sometimes up to 8 times its normal running wattage — during those first few seconds of operation. A hard start kit for AC compressor units helps deliver this power boost efficiently, reducing strain on electrical components. HVAC systems can consume up to 40% of a building's total energy usage, making efficiency improvements particularly valuable.

The AC hard start capacitor stores electrical energy and delivers it in a controlled burst exactly when the compressor needs it most. This helps overcome the initial resistance and gets the compressor running more quickly and smoothly.

How Do I Know If I Need an AC Hard Start Kit?

Your air conditioner might be literally asking for help, but because it can't speak, here are the signs to watch for:

• If you hear clicking but your compressor doesn't engage, this could indicate it's struggling to overcome initial resistance.

• If the lights dim when the AC kicks on, this suggests your compressor is drawing excessive power during start-up, straining your electrical system.

• If your unit turns on and off frequently, a hard start kit might help the compressor reach operating speed before the system shuts down.

• Air conditioners over five to seven years old often benefit from an AC start assist kit, as components naturally wear down over time.

• If you live in an area with extremely high temperatures, your AC works harder and might benefit from start-up assistance.

What Are the Benefits of an AC Hard Start Kit?

Installing an AC hard start kit offers several advantages beyond just getting your system running:

• Extended equipment life. By reducing strain during the most demanding phase of operation, you can potentially add years to your compressor's lifespan.

• Reduced energy consumption. With quicker starts, your system draws peak current for shorter periods. The benefits of AC hard start kit installation include potential energy savings on your cooling costs.

• Lower repair costs. By preventing failed start attempts, you reduce wear and tear on related components.

• Improved performance in challenging conditions. Whether dealing with power fluctuations or operating in extreme temperatures, your system will be more reliable.

• Quicker cooling cycles. With more efficient start-ups, your home reaches the desired temperature faster, improving overall comfort.

More Related Articles:

• How Much Does It Cost to Install an Air Conditioner?

• What Size Air Conditioner Do I Need?

• So Your AC Went Kerplunk: Here’s What to Do Next

• Hot This Summer? Here’s Everything You Need to Know to Keep Cool

• Should You Repair or Replace Your Air Conditioner?

How Do You Install an AC Hard Start Kit?

Installing an AC hard start kit is relatively straightforward for those comfortable with basic electrical work, but many homeowners prefer to leave it to professionals. Here's a general overview of the process:

• Always turn off power to your AC unit at both the thermostat and circuit breaker.

• Locate the compressor, which is typically in the outdoor condensing unit.

• Identify the connection points. Most hard start kits connect to the compressor's run capacitor.

• Install the hard start kit according to its specific wiring diagram found in the manufacturer's instructions.

• Ensure all parts are properly mounted and wires are secure.

• Turn the power back on and run your system to verify proper operation.

If you're not comfortable working with electrical components, hiring a professional is recommended. A qualified HVAC technician can install an AC hard start kit in approximately 30 to 60 minutes. Professional installation typically costs between $100 and $300 (CAD 140 and CAD 418), including the part.

Does a Hard Start Kit Make an AC Run Quieter?

When a compressor struggles to start, it often creates that laboring, straining noise that sounds like your AC is gasping for breath. By providing the extra electrical boost needed for a clean, efficient start-up, a hard start kit eliminates much of this struggling starting noise. Additionally, compressors that start more efficiently tend to reach their optimal running speed more quickly, which can reduce operational vibrations that contribute to noise.

However, it's important to note that a hard start kit won't fix all AC noise issues. If your system has mechanical problems, loose components or airflow restrictions, these will need to be addressed separately. The hard start kit specifically addresses noise related to difficult compressor start-up.