The Carrier® Rooftops app is the first in the commercial heating, ventilation and air-conditioning industry (HVAC) to allow users anywhere in the United States and Canada to perform on the spot selection of rooftop units for both replacement and new construction, and estimate energy savings between Carrier® Weather Series units. Users can input an existing unit model number for Carrier or competitive equipment, or desired unit specifications, and obtain the optimal Carrier model for their requirements.