Simon & Garfunkel’s iconic lyrics paint a world where quiet prevails, where people “talked without speaking” and “heard without listening.” But in reality, silence—or at least the absence of intrusive noise—has profound implications, especially in buildings where we work, learn, and live.
Much of the focus on noise in buildings revolves around its impact on occupants. Sound levels are measured in decibels (dB), with the “A” in dBA denoting a scale adjusted to the human ear’s sensitivity. Prolonged exposure to loud noises can lead to hearing loss, which is why safety organizations like Occupational Safety and Health Administration (OSHA) in the U.S. and the Employment and Social Development Canada (ESDC) regulate workplace noise limits.
In the U.S., OSHA caps noise exposure at 90 dBA over an eight-hour period, while other groups, such as the American Conference of Governmental Industrial Hygienists (ACGIH), recommend a lower threshold of 85 dBA. To put this in perspective, a typical conversation averages around 60 dBA, while a leaf blower can reach 95 dBA up close.
Inside a building, noise takes on a different form. The hum of HVAC systems, buzzing lights, and the chatter of daily activity contribute to the soundscape. In a quiet library, sound levels might hover around 40 dBA, providing a stark contrast to noisier environments.
Cross the Atlantic, and you’ll notice a distinct difference in ambient noise levels, especially in schools, hospitals, and offices throughout Europe. European Union construction codes and materials prioritize noise reduction more than their North American counterparts. In the Netherlands and Belgium, the noise limit for building systems is 30dBA.
Traditional fans and ductwork in many North American HVAC systems can result in much higher background noise levels. In Europe, better-engineered systems contribute to quieter public spaces, improving the overall experience for occupants.
Noise isn’t just a nuisance—it has measurable effects on cognitive performance. Studies have repeatedly shown that noise pollution, both indoors and outdoors, can reduce concentration and increase stress.
In one French study, a 10 dB increase in noise above 50 dB led to a 5.5-point drop in elementary students’ standardized test scores. Similarly, a New York City study revealed that students in classrooms facing loud train tracks were 3-11 months behind in reading compared to their peers in quieter classrooms.
Neurobiologist Nina Kraus, author of Of Sound Mind: How Our Brain Constructs a Meaningful Sonic World, emphasizes that even background noise we think we’ve “tuned out” affects our brains—particularly in children.
“There are sounds people think are safe, but they really aren’t,” says Kraus. “Even if we're not paying attention, noise impacts our ability to think on multiple levels.”
Reducing building noise starts with addressing common culprits like HVAC systems and light fixtures. Quieter systems enhance comfort and promote better learning, communication, and productivity.
Investing in quieter, more efficient HVAC systems is more than a comfort upgrade—it’s a step toward healthier, more productive spaces. As schools and businesses prioritize energy efficiency and occupant well-being, demand for low-decibel systems will continue to rise.
Whether you’re designing a classroom or planning a corporate office, don’t underestimate the impact of noise. A quieter environment fosters focus, reduces stress, and ensures no one struggles to hear—or be heard. As Simon & Garfunkel might suggest, sometimes, the sound of silence is exactly what we need.
Recognizing the impact of loud sounds on people’s cognitive abilities, we focus on creating indoor climate solutions that minimize ambient noise. Even our most powerful solution, designed for large warehouses and open spaces, reduces the traditional noise level by 6dBA. One of our most powerful fancoil units, the Briza dBA, can cover up to 27' of horizontal air throw and remain under 35dBA.
As we look to build smarter, heating and cooling systems that reduce noise in a building are a good place to start.
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