The current R22 refrigerant phaseout is important to many people using older air conditioning systems, most units installed before 2010 use R22. This refrigerant has been used for many years and has been in a phase out over several years. After 2020 it will not longer be produced in the US and will also be banned from import. Existing supplies can be used, but will be very costly and a finite supply.
An HVAC Inspection provides you with a system analysis which will let you know how well your system is operating. Often you can discover an issue and get it fixed before it fails. It is an advantage allowing you to make plans to repair or replace equipment before a complete failure.