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HVAC will not turn on

\015 My air conditioning unit will not turn on. The technician that came out said that the freon was only half full and he found a small leak outside. Can this be the cause of the unit not turning on at all? It wouldn't blow any air. I have had 5 service calls in the past 6 months for the upstairs and downstairs units not coming on when they should. The technicians that respond are all from the same company and are answering a call for a warranty company. They have told me they couldn't find anything wrong until this call. When the heat wouldn't come on periodically they found nothing that would cause it.\015

Answers :

If the freon pressure gets low then the low pressure cutout switch kills the low voltage to the thermostat and the unit will not run.

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