How to Protect Your Air Conditioner From Voltage Drops and Power Surges


Air-conditioners are sensitive electronic appliances that are prone to damage from power surges just like any other appliance. But, there are a couple of tools that you can use to safeguard them.

In addition to cleaning the filters, consider installing the Intermatic Compressor Defender. It’s a surge and low-voltage protector for your AC unit.


Don’t rely on any built-in surge protection for your air-conditioner. Despite what the manufacturer might claim, added protection will ensure your AC units will keep running smoothingly throughout the hottest days of summer.

Monitor Your Voltage

Maintaining consistent power to your air-conditioner will keep it running smoothly all summer. When the voltage is too low the motor will pull more than normal current and the temperature of the motor windings rise 10% to 15% for each 10% drop in Voltage.


This can damage motors and wear on the life of your AC. The Compressor Defender continuously monitors voltage and will react quickly (3 line cycles) to low voltage conditions, even before an overload (failsafe) has time to heat up and react.

compress defender

Power quality is an issue at grids across the country, with rolling blackouts becoming more commonplace, so it’s vital to protect your AC units as best you can.

Surge Protection

Proper surge protection is also important to ensure our sensitive electronics aren’t damaged. We’ve previously covered Intermatic’s Surge Protective device, which does an outstanding job safeguarding our household electronics, but what about major household appliances, specifically the air-conditioner.

surge protector

Intermatic has a solution to prevent brownouts, surges, and short cycles at 120,208, and 240 VAC loads. Their Compressor Defender absorbs surges so your AC can continue running smoothly and without interruption.

AG surge

When a surge hits your air-conditioner, it can cause it to reset and can throw off the settings and basically cause havoc on its electronics, much like it would on any computer.


The Compressor Defender takes 10 minutes to install and can be placed inside a condensing unit or on an outdoor compressor. It is compliant with the AHRI standard 110-1012.

defender surge

By installing a Compressor Defender you’ll save money on expensive service calls and out of warranty repairs.

Air-conditioners can last a long time if we take the necessary steps to protect them.

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