Have you ever noticed the bulky metal boxes and ducts that sit atop many buildings? These are known as residential rooftop HVAC (Heating, Ventilation and Air Conditioning) units, and they provide an essential role in making homes comfortable. They regulate indoor temperature and humidity while also transporting air in, out and around the building. Whether it’s cooling down a home when it’s scorching hot outside or keeping temperatures cozy during the winter months, these reliable units work hard to help maintain a quality of life for building occupants. But what is the official business definition of residential rooftop HVAC units? Let’s take a look!