If you have central HVAC, there could definitely be sections of your home that don't receive enough conditioned air. That is, your AC might not reach the far corners of some rooms. Also, the airflow issues you have during the winter months with your heater are bound to be different than what you are going to have with your AC during the summer months. A room that needs more heat during the winter isn't necessarily going to need more cool air during the summer. You need to figure out how you can maximize airflow in your HVAC system to make sure that every square inch of your property is being penetrated by your heat and air conditioner.
Fans Work Great During Summer
During the summer, the obvious solution for your AC system is to use electric fans that help circulate the air further into the rooms. The best thing about fans is that they are affordable, convenient, they can be moved around the room, and you can put them away in a closet when you aren't using them. But you still have to deal with the hassle of getting the fan out, adjusting it, and having the cords strung across the room. Also, fans can be used to move heat further through a room, but the fan will obviously cool down the air as it pushes it.
One great solution to airflow problems that actually works during the winter and summer is to install booster registers in the rooms that need them the most. These are essentially electronic registers with small fans directly inside them. The fans push the air out of the register with much greater force and speed. The register will have a better range so the air can be more effective in larger rooms.
Also, you don't need to have the boosters on all the time. So if your AC is running, you can turn on the fans so that you get a little more airflow only when needed the most. These boosters are very convenient when you consider the fact that they don't have any cords, don't need to be plugged in, don't need to be put in storage, and don't take up any space. They are the same size and profile as normal air registers.
Whether you use fans or booster registers, don't be afraid to do what you can to increase your airflow. It could save you money in the long run by enabling you to adjust your thermostat.
Contact an air conditioning repair company for more information on how to boost your airflow.