A Short Cycling AC Is a Big Problem
Jason Corbett • September 14, 2022

A Short Cycling AC Is a Big Problem


An air conditioner that keeps switching itself on and off is short cycling. And while short cycling is annoying, it’s more than just a frustration — it’s a big problem for your AC unit. Short cycling occurs for a few reasons, and as it puts a huge strain on your air conditioner, it can shorten your unit’s life span considerably. 


What Causes AC Short Cycling?

An air conditioner should cycle every 15 to 20 minutes, about three times per hour. If it’s really hot outside, your unit can cycle more frequently, and it will do the same if the thermostat is set way below the current indoor temperature. It does this to maintain a constant cool temperature, which you need in sunny California. 


When an AC is stuck in the cycle of starting up, it will turn on and off constantly without completing a proper cooling cycle. The most common problems that cause AC short cycling include: 


Incorrectly Sized AC Units

When you buy a new AC unit, it is imperative that it is the right size for the space. An AC that is too large will be unable to run a complete cycle or remove the humidity from the air. The AC needs to run for 20 to 30 minutes to cool efficiently and dehumidify. An AC that is too large needs to be replaced with the correct sized unit. 


Electrical Problems

Short cycling can be caused by loose wires or corroded electrical connections. A heat pump with loose wires can lose power for a short time, then switch back on again, and continue this process repeatedly. Schedule an air conditioning repair in Concord, CA, to have the loose wiring fixed.


Thermostat Malfunction

A miscalibrated thermostat will be unable to read the inside temperature correctly and will cycle on and off. Unfortunately, a malfunctioning thermostat will need replacing. 


Low Refrigerant Levels

Low levels of refrigerant will cause your AC to overheat and switch itself on and off. Similarly, an overcharged AC will leak refrigerant into the compressor and cause the system to switch on and off. 


If your AC is short cycling you need a fast air conditioning repair in Concord, CA. A short cycling AC will increase your power bills and cause your AC to wear out quickly as it puts the motor and compressor under great strain. 


Air Conditioning Repair in Concord, CA 

A short cycling AC can be a big problem, and you need the AC experts at Mercury Heating and Air for a fast air conditioning repair in Concord, CA. Call us today for a professional and friendly repair.


Wildfire smoke surrounding a California home during wildfire season near Concord, CA.
By Jason Corbett August 24, 2026
Protect your Concord home from wildfire smoke with proper HVAC filtration, air purification, and practical ways to improve indoor air quality.
Ductless mini split indoor and outdoor HVAC system installed on a Concord, California home.
By Jason Corbett July 27, 2026
Learn whether ductless mini split installation in Concord, CA, homes is the right choice. Explore zoning, energy efficiency, installation, and comfort benefits.
HVAC tools and outdoor air conditioning unit beside a home, illustrating maintenance and efficiency.
By Jason Corbett June 30, 2026
Learn how summer heat affects HVAC efficiency in Concord, CA, and discover ways to reduce energy costs while keeping your home comfortable.
Homeowner adjusting smart thermostat to improve HVAC energy efficiency before summer in Concord, CA.
By Jason Corbett May 25, 2026
Improve HVAC energy efficiency in Concord, CA, with filter changes, smart thermostat upgrades, and professional AC tune-ups before summer.
HVAC technician performing maintenance on residential air conditioning unit while evaluating AC repa
By Jason Corbett April 27, 2026
Learn whether AC repair or replacement is best in Concord, CA by comparing system age, repair costs, and energy efficiency.
Mercury HVAC technician servicing air conditioning unit using new refrigerant in California home.
By Jason Corbett March 30, 2026
Learn how 2026 HVAC refrigerant changes in California impact AC systems, R-410A phase-out, and what to consider when upgrading your unit.
Show More