The answer to 'what does system upgrade do' is a system upgrade refers to replacing or enhancing the major components of an HVAC (Heating, Ventilation, and Air Conditioning) system to improve its performance, efficiency, and reliability. This typically involves replacing the furnace, air conditioner, or heat pump with newer, more advanced models that offer improved features and energy savings.
A system upgrade can provide several benefits, including increased energy efficiency, reduced utility bills, improved indoor air quality, and enhanced comfort. Newer HVAC systems are often designed with advanced technologies, such as variable-speed motors, multi-stage compressors, and smart thermostats, which can significantly improve the system's overall performance and efficiency.