Clearing the Air: H2M Busts Common AC/HVAC Myths
By:John Lahey | Senior Project Engineer – Mechanical Engineering at H2M architects + engineers
When it comes to keeping school facilities comfortable and energy-efficient, there’s no shortage of heating, ventilation, and air conditioning (HVAC) advice circulating online or from well-intentioned neighbors. There are also many myths surrounding the negative impact AC/HVAC systems can have on school buildings.
To help set the record straight, Senior Project Engineer John Lahey, P.E. recently “busted” five of the most persistent AC/HVAC-related myths. From misconceptions about the spread of airborne diseases to the truth about expenses, Lahey breaks down the facts and helps clear the air.
Myth 1: AC/HVAC systems spread airborne diseases.
HVAC systems are designed to improve indoor air quality, from ventilation to filtration. The New York State Education Department (NYSED) recommends installing high-efficiency air filters (MERV 13 or better) and increasing ventilation, which has proven to be safe methods for removing pathogens and other contaminants. MERV 13 can filter out bacteria, pollen, mold, dust and some viruses. Nurses’ rooms often have a dedicated exhaust to keep the air from flowing back into the building.
There are other technologies, such as bipolar ionization, but the NYSED does not recommend them because they are newer technologies and may have unintended by-products. Ultraviolet light is another option, but the NYSED has strict usage requirements.
Controlling temperature and humidity can also reduce how long viruses and bacteria stay in the air. A relative humidity of 40 to 60 percent will reduce the spread of pathogens.
Myth 2: AC/HVAC installations are incredibly expensive.
There are a wide range of cost-effective options available to schools. H2M architects + engineers works with school clients to identify the optimal steps forward. While the initial installation of an AC/HVAC system is a significant investment, it is essential to consider the long-term benefits and savings. Modern energy-efficient systems reduce utility costs over time. Furthermore, schools that meet energy efficiency goals often qualify for rebates, offsetting installation costs.
Myth 3: AC/HVAC installations are disruptive.
Engineering firms and contractors are experienced in minimizing disruptions during HVAC installations, especially in school environments. Much of the work can take place during evenings, weekends, and school breaks to minimize impact on daily operations. Modular systems and phased installation plans enable smooth integration with existing infrastructure, minimizing disruption to the learning environment. Proper communication and planning with school administrators ensures that projects run efficiently and with minimal classroom disruption.
Myth 4: AC/HVAC is noisy and disruptive to the learning environment.
Many modern HVAC systems are designed to operate quietly, with noise levels that comply with recommended standards for classrooms. When required, additional noise-reducing features are available, including acoustically lined ducts, vibration dampeners, and sound-attenuating materials, to ensure that the system does not interfere with instruction or focus. Engineering firms also perform acoustic reviews during the design phase to mitigate noise concerns. The result is a comfortable learning environment without the distraction of loud equipment.
Myth 5: AC/HVAC installation is unnecessary to maintain comfortable classroom temperatures.
With the revised New York State law setting maximum allowable classroom temperatures during hot weather, effective climate control has become essential. The law reflects growing recognition of the impact of excessive heat on students’ safety and ability to focus and learn. While fans and open windows may provide temporary relief, they are inadequate during heat waves or in areas with poor air circulation. AC/HVAC systems ensure consistent comfort, helping schools comply with state regulations and foster a productive educational environment. Many modern HVAC systems provide heating and cooling capabilities from the same equipment, which means that the same equipment can help with climate control all year long.