The answer to 'types of replacement' is that there are several common types of HVAC system replacements homeowners may need. The most common are replacing the entire system, just the air conditioner or furnace, or specific components like the thermostat or air filter.
Replacing the entire HVAC system is typically done when the existing system is very old, inefficient, or no longer working. This involves installing a brand new air conditioner, furnace, and related components. Replacing just the air conditioner or furnace is an option if one part of the system fails but the other is still in good condition. Upgrading specific components like the thermostat or air filter can also improve efficiency and performance without a full system replacement.