If it seems like your air conditioner turns on and off every few minutes, it may be short-cycling. Under normal conditions, your AC should cycle no more than every 15 minutes, or a few times per hour. If it’s cycling on and off constantly, it almost certainly means that your AC requires professional attention. Here are some of the most common reasons an AC will short-cycle.
Why San Antonio Homeowners Should Not Ignore Short Cycling
It may seem that a short-cycling AC is little more than an annoyance. In reality, it’s usually a sign that your AC may be nearing a component failure. It’s also an indication that your AC isn’t working efficiently, which will increase your cooling bills. Ignoring a short-cycling AC will only worsen the underlying problem, which could force a premature system replacement.
What Causes Air Conditioners to Short-Cycle?
There are multiple reasons that an AC might short-cycle. They range from malfunctions to installation issues. The most common causes include:
Thermostat Issues
Sometimes, an AC will short-cycle because that’s what its thermostat tells it to do. Thermostat malfunctions are the most common non-mechanical cause of short-cycling. For example, a faulty thermostat temperature sensor may lead to erratic AC operation. Or a damaged thermostat wire may interrupt communication between your AC and thermostat.
Refrigerant Leak
Your AC relies on its refrigerant to extract heat from your home’s air. If your AC develops a refrigerant leak, it may cause short-cycling. Typically, it results from abnormally low evaporator coil temperatures triggering premature shutdown. But when your thermostat senses that your home is still too warm, it tells your AC to turn back on.
A refrigerant leak can also lead to a damaged or destroyed compressor. So, if your AC is also blowing warmer air than usual or making odd noises, don’t ignore it. A failed compressor almost always forces you to replace your whole AC. If you act fast, however, an AC repair can restore your system to normal operation.
Airflow Issues
Anything that restricts airflow through your AC’s indoor unit can cause short-cycling. That includes blocked vents, a dirty evaporator coil, or a dirty air filter. When your AC experiences restricted airflow, it may overheat, leading to premature shutdowns. The behavior is intentional; it’s to prevent component failures and alert you to a problem.
Regular AC maintenance can help keep your system’s components clean and prevent airflow issues. You should also avoid closing too many vents in your home. If your home also suffers from uneven cooling, it’s wiser to have your ducts air-balanced instead. That can equalize temperatures in your home without starving your AC of sufficient airflow.
Oversized AC
If your AC has always short-cycled, it’s possible that the system’s too large for your home. In that case, the AC will quickly drop your home to your set temperature, leading to shorter cycle times. Unfortunately, this will lead to energy waste and excess wear and tear. It can also lead to uncomfortable temperature swings in your home.
The only way to fix an oversized AC is to replace it. In some cases, adjusting your AC’s blower speed may help. However, that’s not a real solution and won’t eliminate your problem. It’s necessary to perform a Manual J heat load calculation to replace your AC with a properly sized unit.
Frozen Coils
Finally, a frozen evaporator coil can lead to a short-cycling AC. It’s a problem that can result from restricted airflow or refrigerant loss, which can compound either problem. When your AC’s evaporator coil freezes, it simultaneously prevents cooling and causes the system to overheat. Both can force your AC to shut down to protect itself.
Unfortunately, it’s difficult for you to detect a frozen evaporator coil yourself, since you can’t visually inspect it. However, there are a few things to look for that may tip you off. One is if there’s no water dripping from your AC’s condensate drain while it runs. The other is if your AC stops short-cycling after you’ve left it off for a few hours.
Call Wilks Air Conditioning & Heating for Short-Cycling AC Repair in San Antonio
Air conditioner short cycling is an issue that requires an immediate inspection and repair. Wilks Air Conditioning & Heating is the place to call when your AC short-cycles. We’ve served the San Antonio, TX, area for over half a century. Our team of HVAC experts can maintain and repair ACs of all makes and models. And we back our repairs with a worry-free guarantee.
We’re even Better Business Bureau-accredited with an A+ rating. And we offer flat-rate pricing, so you don’t have to worry about surprise charges.
If the AC in your San Antonio home starts short-cycling, contact Wilks Air Conditioning & Heating for an AC repair right away.
