Consider factors such as your climate, building design, and budget when selecting insulation R-value for your home.
Use higher density insulation, such as rigid foam boards, in cathedral ceilings and on exterior walls.
Ventilation plays a large role in providing moisture control and reducing summer cooling bills. Attic vents can be installed along the entire ceiling cavity to help ensure proper airflow from the soffit to the attic, helping to make a home more comfortable and energy efficient.
Recessed light fixtures can be a major source of heat loss, but you need to be careful how close you place insulation next to a fixture unless it is marked. "I.C."-designed for direct insulation contact. Check your local building codes for recommendations.
As specified on the product packaging, follow the product instructions on installation and wear the proper protective gear.