It can be concerning when your heat pump starts making strange noises. The following are some sounds you might hear coming from your heat pump in Melbourne, FL, and what could be causing them:


A refrigerant leak often leads to a hissing sound. The refrigerant is the lifeblood of your heat pump, enabling it to cool your home effectively. If this sound occurs, switch off your system immediately and call a certified HVAC service technician to check the refrigerant levels.


A clicking sound at startup is typically normal, but if it becomes consistent, it’s usually one of two problems. It could mean there’s an issue with the compressor or there’s debris stuck where it shouldn’t be. The latter is usually an easy fix by a professional as long as there’s no damage, but the former may require more in-depth repairs.


A buzzing noise might signal an electrical issue, possibly due to a problematic contactor relay switch, condenser fan motor or loose part. Your HVAC service technician can diagnose the issue and get the buzzing to stop.

High-Pitched Whistling

Typically, a dirty air filter is the most common cause of high-pitched whistling coming from a heat pump. The filter is usually supposed to get cleaned every three months, so if it’s been a while, it’s time to schedule an HVAC appointment. A service technician can replace the air filter and see if the whistling is gone or if there’s a different issue.


Something as simple as debris lodged in the outdoor unit or a loose piece of hardware could cause a rattling sound. An AC repair appointment is necessary so the noise goes away while the cool air continues throughout the summer.

If your heat pump starts making unfamiliar sounds, it’s important to act swiftly. Contact Merritt Island Air & Heat today for excellent heat pump services.

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