Why Your HVAC System Might Be Short Cycling—and What to Do About It
Is your furnace or AC turning on and off more often than usual? That’s called short cycling—and it’s not just annoying, it’s a red flag. Short cycling can waste energy, reduce system lifespan, and leave your home feeling anything but comfortable. Understanding what’s causing it can help you get ahead of bigger issues and avoid unnecessary costs.
What Is Short Cycling?
Short cycling occurs when your HVAC system starts up, runs for a brief period, then shuts off prematurely—only to repeat the process minutes later. Instead of operating in long, efficient cycles, the system keeps turning on and off. This constant restarting prevents your system from properly regulating temperature and maintaining humidity levels, which ultimately leads to inconsistent comfort throughout your home. It’s a sign that something is off—and it shouldn’t be ignored.
What Causes It?
There are a variety of reasons your HVAC system might be short cycling, including:
Clogged Air Filters: Dirty filters restrict airflow, making it harder for your system to circulate air. This can cause it to overheat or shut down early to protect itself, triggering a restart loop.
Oversized System: If your HVAC system is too powerful for the space it’s serving, it will cool or heat the home too quickly and then shut off. While this might sound efficient, it actually leads to more frequent wear and tear, poor humidity control, and uneven comfort.
Thermostat Issues: Incorrect thermostat placement—like being installed near a draft or heat source—or faulty wiring can send the wrong signals to your HVAC system. That confusion can lead to premature shut-offs or irregular cycling.
Low Refrigerant or Faulty Flame Sensor: Low refrigerant can cause your air conditioner to behave erratically and shut off to prevent damage. In furnaces, a malfunctioning flame sensor can prevent the system from staying on safely, triggering frequent resets.
Each of these issues requires a different fix, so it’s important to diagnose the exact cause.
Why It Matters
Short cycling might seem like a minor inconvenience, but it comes with major consequences. The repeated on-off behavior puts unnecessary stress on components like your compressor or ignitor, which can lead to early system failure. It also wastes energy—driving up your monthly bills—and reduces your system’s ability to keep your home comfortable. Left unaddressed, short cycling can lead to frequent repairs or even total replacement far sooner than expected.
How to Fix It
Some fixes are simple—like changing your air filter. Others require a licensed technician to inspect your system, evaluate sizing, or test for more complex issues. The key is acting early before a small problem turns into a major breakdown.
Break the Cycle with Expert Help
Short cycling is more than just an annoyance—it’s your HVAC system waving a red flag. Left unchecked, it can wear down your equipment, hike up your energy bills, and leave you sweating when you need relief the most.
If your system keeps turning on and off too frequently, let the pros at Murphy’s Heating & Air take a look. We’ll diagnose the issue, fix it fast, and help prevent future breakdowns.
Call (661) 499-9691 or book online today to get your comfort back on track.
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