We check and test your vehicles air conditioning, re-gas it, treat with anti-bacterial treatment plus check your pollen filter to make sure it’s working properly as if it needs changing this makes a big difference to your filtered air in the cabin (this will need to be purchased separately), check pipes, and various other parts.
The chances are you will never of had your air conditioning system serviced, this can result in unpleasant musty smells, cold/flu symptoms increased fuel consumption and a build-up of bacteria.