Noise from an AC unit or heat pump? We measure and advise.
The popularity of heat pumps and air conditioners is growing rapidly due to the energy transition. But the outdoor unit produces noise, often a constant low-frequency hum that is especially perceived as disturbing at night. In densely built residential areas this can exceed the standards from the Activiteitenbesluit and lead to sleep disturbance and neighbour conflicts.
Schedule free consultationThe noise standards for heat pumps and AC units
The Activiteitenbesluit sets limit values: 50 dB(A) during the day, 45 dB(A) evening and 40 dB(A) night at the neighbours' façade. For tonal noise (hum) a 5 dB penalty is applied, lowering the effective night value to 35 dB(A). Many heat pumps produce precisely tonal noise, so the standard is exceeded sooner than expected. In addition limit values apply for the indoor level in the affected resident's home.
What do we measure for heat pumps?
Sound level at the façade of the complaining party compliant with the Activiteitenbesluit. Frequency analysis (1/3 octave bands) to establish tonal noise. Background level (reference without the installation) to isolate the specific noise. For low-frequency problems we extend the analysis down to 20 Hz.
Solutions for exceedances
Sound-insulating enclosures can reduce the noise by 10 to 20 dB if correctly dimensioned (ventilation must remain guaranteed, otherwise the unit overheats). Vibration dampers under the unit prevent structure-borne noise via the wall or roof. Relocating to another façade increases the distance to the affected party. Sound screens are effective at larger distances. We calculate which measure is most effective and cost-efficient in your specific situation.
Legal route for heat pump disturbance
When the standard is exceeded you can ask the municipality to enforce. In a civil law procedure our report is the evidence of unlawful nuisance (article 5:37 Dutch Civil Code). Many legal expenses insurances reimburse the cost of the measurement. The number of legal disputes about heat pump noise has risen sharply in recent years.
Consultation or direct quote
Schedule a free consultation or request a direct quote via the form. We respond within one business day.