Insulation that is properly installed in a building's ceilings, walls and floors can lower heating and cooling costs and help keep occupants comfortable. Types of insulation typically include fiberglass batts, blown-in cellulose, rigid foam and spray foam, the effectiveness of which depends on the material's resistance to heat flow (R-value) and how and where it is installed. Heat flows in buildings from warmer to cooler areas. Heat lost in winter is replaced by the building's heating system, and heat gained in summer is removed by the cooling system. Proper insulation reduces this heat flow, thereby decreasing the heating/cooling system's energy requirements.
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