This technical report contains detailed information about anechoic recordings from an air-to-water heat pump system in different operating states. Based on these recordings, a total of 28 stimuli were selected and processed from three different operating states: high-power heating, maximum capacity, and defrost. Additionally, the measurement of the horizontal directivity of the heat pump using 12 microphones is documented in this report. The described data is available under a CC BY 4.0 license and is primarily intended for further scientific use, e.g., in perceptual assessments of heat pumps.