Not all reputable companies are reputable:
Sad: 6 out of 6 air conditioning repair companies randomly picked were all A/C scams.
Watch this video: tech caught intentionally disabling unit.
Beware of the $29 service call offers, as they usually consist of commissioned paid techs, that their salary depends upon them selling you something... regardless if needed or not. Sherlock Homes proudly pays their techs for their work and only their work, and promotes them to encourage you not be buy anything you don't need or will not want.