Are heat pumps typically noisy?

Modern residential air-source heat pumps are engineered to operate relatively quietly, typically generating a consistent low-level hum and fan whirring sound measuring around 55 to 75 decibels, which is roughly equivalent to a normal conversation or a quiet vacuum cleaner. This makes them generally unobtrusive when installed at a reasonable distance from living areas and property lines. However, whether a heat pump is perceived as noisy depends heavily on equipment age, brand quality, installation location, and surrounding hardscape surfaces. Older units, failing compressor mounts, unbalanced fan blades, or units installed directly beneath a bedroom window or enclosed in a narrow masonry courtyard can bounce sound waves and create noticeable disturbance. You can verify noise levels by checking manufacturer decibel specifications or installing vibration-dampening pads.