No matter if it is summer or winter, insulation can be a tool used to help reduce your energy costs, and allow you to make sure that you have a more comfortable home environment. There are lots of different types of insulation, and different places you may consider insulating. Some popular places that people talk about insulating are in the attic above the top floor ceiling and in the walls of the home. There are also different types of insulation as well. Depending on the project, and if it is new or an existing home, different types of insulation may be better suited for your needs. For example, if you have an existing home which already has insulation in the attic, but not enough you would be better suited to add in non faced fiberglass insulation over faced fiberglass insulation. Here is a quick video from "Ask This Old House" on why.
In addition to this, if you are looking at doing insulation in the walls, you may consider different types as well. One factor to consider is R Value. There are different R Values in the insulation. These numbers are talking about how much they resist letting the warm air escape. Again, something to consider is if the home is new construction where the walls are all open, or if it is old construction where there is already drywall up. Here is another video from "Ask This Old House" on the different types of wall insulation.
I hope this was helpful and was able to point you in the right direction when it comes to reducing your utility bills through proper insulation improvement.