Explaining the Heat Pump Defrost Cycle

What is the Defrost Cycle?

Sometimes, your HVAC system’s condensing unit coil (located outside) can become too cold, leading to ice/frost buildup. To ensure proper functioning, your unit will naturally enter a heat pump defrost cycle, a process designed to thaw the ice/frost on the coil.

Heat Pump Defrost Cycle Guide

Remember, frost on your unit’s coils is normal. If your unit enters the defrost cycle, it’s important NOT to disrupt – the process is typical and natural to your unit. Instead, allow the system to run and finish thawing. Here are some common signs that your system may be in the defrost cycle:

Defrost Cycle Indicators

  • Whooshing sounds
  • Metal grinding sounds
  • Dripping sounds
  • Sizzling sounds
  • Frost on coil
  • Steam (that may appear as smoke) coming from the condensing unit
  • You unit’s outside fan turning off

Watch our Guide to The Defrost Cycle  video to see the process in action.

Heat Pump Repairs in Jacksonville, FL

While the defrost cycle is normal and no cause for concern, the experts at AC Designs are always here to ensure your HVAC system is performing at its best. If you notice any irregularities or have concerns about your heat pump, our Jacksonville, FL team is ready to assist with professional heat pump repairs. Make an appointment today to stay in your comfort zone.