It depends on various factors, including the quality of construction, the type of HVAC unit, the location of the apartment, and the building regulations and noise control measures in place. In some cases, neighboring apartments may have noisy air conditioning or HVAC units that can be heard from within your unit, while in other cases they may not be audible at all.
Newer buildings generally have better noise insulation and may be designed to minimize sound transmission from HVAC units. However, older buildings or those with low-quality construction might have less effective soundproofing, allowing sound to travel more freely.
Additionally, the type of HVAC unit can also make a difference. Some systems, particularly window or through-the-wall units, tend to be noisier compared to central air conditioning systems.
It's always a good idea to inquire about noise insulation measures when renting or buying an apartment, as well as checking with neighbors or reading reviews to get a sense of any potential noise issues related to HVAC units.
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