2. HVAC Resources
  3. Learning Center
  4. Short Cycling
Search for glossary terms (regular expression allowed)
Short Cycling

Short cycling occurs when your HVAC system frequently starts and stops, which can reduce efficiency and lifespan due to improper thermostat signals.

What Is HVAC Short Cycling?

Short cycling occurs when your HVAC system (air conditioner or heat pump) turns on and off more frequently than it should. Normally, an HVAC system cycles on to adjust the temperature, then cycles off once the desired temperature is reached. During mild conditions, it might only need to run for 3-5 minutes. On hot days, it may run longer with shorter off cycles.

However, short cycling disrupts this process, with the system frequently turning on and off, leading to potential issues for your comfort, energy bills, and the lifespan of your equipment.

Impact of Short Cycling

  1. Reduced Comfort: Short cycling can prevent effective dehumidification, leaving the air feeling sticky and uncomfortable. You may also experience uneven temperatures throughout your home.

  2. Higher Energy Consumption: Frequent cycles cause the HVAC system to use more energy, resulting in higher utility bills.

  3. Increased Wear and Tear: Short cycling places more strain on the system’s components, potentially leading to more frequent repairs and reduced system lifespan.

Common Causes of HVAC Short Cycling

  1. Malfunctioning or Poorly Positioned Thermostat

    • Issue: A faulty thermostat or one placed in a location exposed to direct sunlight or near vents may trigger unnecessary cycles.
    • Solution: Try troubleshooting the thermostat or repositioning it to a central location, away from vents and direct heat sources.

  2. Improperly Sized HVAC System

    • Issue: If the HVAC system is too large, it will cool or heat the space too quickly, leading to short cycles and poor humidity control. If it's too small, it may overwork itself in a pattern of “long cycling.”
    • Solution: Proper sizing requires accurate load calculations. If short cycling results from an incorrect size, the best solution is to replace the system with a properly sized unit.

Addressing HVAC Short Cycling

Regular maintenance and correctly placed and sized equipment can prevent short cycling, ensuring comfort, energy efficiency, and longevity for your HVAC system. If you suspect short cycling, consult with an HVAC professional to assess and address the issue promptly.

Request Service Now