The term “roof top heat pump” may sound unfamiliar, but this innovative technology is now being used in businesses around the world to help reduce energy costs and increase comfort. A roof top heat pump is an HVAC system that takes the air from outside the building, cools it during the summer and heats it during the winter, thus improving the indoor environment. These systems are becoming increasingly popular due to their efficiency and ease of installation, as well as their ability to provide a high level of comfort and reduce energy costs. So what is the official business definition of a roof top heat pump? It’s simply an HVAC unit that uses existing outdoor air to create a comfortable indoor temperature all year round.