Started the installation of a new heating and cooling system this involves laying the foundational components before walls and ceilings are finished. This includes installing ductwork, refrigerant lines, vents, and exhausts in the appropriate locations based on the HVAC design. The air handler and outdoor condenser units are also positioned, and necessary electrical and plumbing connections are prepared. Proper placement and sealing of ducts ensure efficient airflow, while planning for future access and system maintenance.