A free estimate is typically provided by HVAC companies to give potential customers a general cost estimate for new installations, replacements, or significant upgrades. This includes a brief visit to your property to assess the scope of the work and provide a preliminary cost estimate. It covers the cost of labor and materials but does not delve into the specifics of diagnosing issues. There is usually no obligation attached to a free estimate, allowing homeowners to compare quotes from different providers.
A diagnostic is a more detailed process aimed at identifying specific problems within an existing HVAC system. Diagnostics requires an in-depth examination and testing of the HVAC system. This may involve checking electrical components, testing airflow, or identifying leaks, among other tasks. Diagnostics are often not free due to the time and expertise required to accurately diagnose issues and provides a detailed report of any problems found and recommendations for repairs or replacements.