Abstract
Room ventilation systems have long been a major cause of noise in classrooms. The recent drive for energy efficiency has motivated schools to partner with utility companies to replace aging central HVAC systems with individual room heat pump window ventilator units for space heating and cooling. An unfortunate consequence is that these window ventilators are significant noise sources. A typical window unit can produce 70 dB(A), or more, at 1 m. Clearly, this is unacceptable. Either ventilator manufacturers must commit to reduce unit noise output by at least 30 dB, or school designers must abandon the wall ventilator option in favor of quiet central HVAC installations.
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