There are many reasons why your home is not cooling properly.  You may have a dirty or clogged condenser or a problem with your compressor.  It could be that there is a issue with your refrigerant.  Age, wear and tear has a lot to do with parts not working properly.  Your best course of action is to get a Majestic AC technician to run a diagnostic check.  Sometimes, we catch small problems before they become large, costly ones.