Heat pumps can be noisy, depending on the model and installation. Generally, the noise level of a heat pump is similar to that of a refrigerator, but can be louder if the unit is not installed properly. Heat pumps are typically installed outdoors, so it is important to ensure that the unit is placed in a location that is away from windows and other noise-sensitive areas. Additionally, the installation should be done by a qualified HVAC technician to ensure that the unit is properly balanced and insulated to reduce noise.