With the increasing usage of heat pumps in residential areas, their noise emissions have become a growing concern. One potential solution is masking, where additional sounds modify the perception of unwanted noise. This study investigated the effects of different types of maskers (pink noise, high-pass filtered pink noise, and water sound) and masker locations on the perceived loudness and preference of heat pump noise. A listening experiment was conducted using a 2-alternative forced choice (2-AFC) method with a 1-up-1-down rule to determine points of subjective equality (PSE). Results show that all maskers improved perceived preference, with water sound being the most effective. These findings provide insights into heat pump noise control strategies.

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