The answer to 'difference between HVAC system and' is that an HVAC (Heating, Ventilation, and Air Conditioning) system is a comprehensive climate control system that includes both heating and cooling components, while a standalone heating or cooling system only provides one function. HVAC systems offer the benefit of whole-home temperature and humidity regulation, while single-function systems are typically more limited in their capabilities.
HVAC systems generally have higher upfront costs due to the additional equipment and installation requirements, but they can provide long-term energy savings and improved indoor air quality. Single-function systems may be more affordable initially, but they may not be as efficient or effective at maintaining comfortable indoor conditions throughout the year.