What could be wrong with my A/C?

have you try refilling the A/C? somtimes there is a button in form of snow that u must press when the a/c is suposly on. now if you have tried that and nothing, try cheking that all fuses work. if you have try this and nothing then is time to worry, it can be the blend door, about running the a/c less than 1 time a season is not true, the cost of repair can be from 10$-500$ depending in what the problem is. (the reason i say up to 500 or posiibly more is cuz the blen door. other wise is in the 20$ or less. good luck