Insulate the Attic
To the same effect of sealing windows, insulating the attic is one of the best ways to create a more comfortable home atmosphere.
The attic is a dirty space packed with airborne pathogens and particles. For certain homes, the air ducts of the central air system are kept in the attic. Even if your ducts are held someplace else, the temperature of the attic plays a huge role in the overall temperature of the home.
This is because the attic climate can easily reach up to 130 degrees, most of which is heat absorbed from outside, especially during the summer.
When the air conditioner operates and cooled air runs through the ducts, the surrounding dirty, hot air of the attic reacts with the cooled air. Leaks and holes in the ductwork introduce dirty air into the clean air supply, contaminating and heating it. The central air system has to work longer and harder to condition the same air over and over again.
Attic insulation helps control the heat load in the attic space. With the blown-in fiberglass method, up to 12 inches of fiberglass is spread over the attic deck. Heat that enters the attic is absorbed into the fiberglass before it can contaminate anything else.
A second method to attic insulation is the radiant-barrier insulation. Your preferred HVAC technicians panel the underside of the roof with aluminum sheets. This prevents heat from ever penetrating the attic space, eliminating the external heat source.