A/c not cooling properly out of vents?

Have you had this problem before now? what I would do first would be inspect the duct in the attic to be sure they are insulated and be sure none have been crushed I don't know if they are rigid or the flexible tube type. Also be sure you check your air filter and change if necessary. I'm sure you do.At night the a/c does cool more efficiently.also don't know the size area vs. size of pump or age of the pump you are using. I certainly am not a heating and air pro. but there are a few things you can check yourself. You may try closing a vent in a room or area not being used to help push more cool air where needed. worth taking a little time to look before having to have a service call. Good Luck, Steve ...................The duct you mentioned is insulated. If I were you I would take time to make sure you dont have any air leaks where your duct join other duct ect. and if still think its not right make the call,