Ductless heat pumps are remarkably quiet during operation. In fact, most manufacturers refer to their systems as “whisper quiet”. And many of our customers tell us they are surprised how quiet their new system is – sometimes even checking to make sure the unit is turned on. But a ductless heat pump can make some noises, and most are a part of normal operation. In addition to the low-level fan sound of both indoor and outdoor units, you may hear “whirring”, “clicking”, or “rushing fluid.”
These sound can be the result of thermal expansion, refrigerant movement, or mechanical parts. There is also a distinct noise pattern as your system moves into defrost mode. These sounds are all a part of normal operation.
However, it is possible that if your system is making noise that it could require service. If any noise coming from your system is disruptive, exceptionally loud or repetitive, it may be a sign that your system is not operating properly.
If you hear any sounds that concern you, please refer to the owner’s manual for indications. If the indications are for abnormal operation or if you become concerned, call us and we will be happy to check it out.