There could be different reasons for this. Make sure your air vents are open and you do have your thermostat set to Cool - ON. If both of these are already set up as suggested, there may be a more serious issue with your AC unit. Give us a call and we can investigate whether air conditioning repair is necessary.
Is the air coming out from the vent is cold or hot? , Is it your house entry is on the north or south ? , Does it get cold at night?, Have you done this , have left the door almost close , did u see any door likely wanna to close or for the air inside it does pull that does close, like the air inside is pulling the the door, it won't close,?, Do you have big windows, does it has window tint , any laundry machine inside, do you go out often?, Have you go in the artic and see anything that air leaks? , Is it the roof flat or triangle shapes, customers should see all this and do some research in advance, thank you hopping this will do some checklist for your next Air Conditioning company .
Thanks! Your answer is awaiting moderation.