It is possible to add insulation to almost any house. Or, you may prefer to hire an insulation contractor. In either case, it is important to choose and install the insulation correctly. Use the recommended levels of insulation for exterior walls for new house construction. When remodeling or re-siding your house, consider using the levels recommended for new construction in your existing walls.
Heat flows naturally from a warmer to a cooler space.
During the cooling season, heat flows from outdoors to the house interior. To maintain comfort, the heat lost in winter must be replaced by your heating system and the heat gained in summer must be removed by your air conditioner. Insulating ceilings, walls, and floors decreases this heat flow by providing an effective resistance to the flow of heat. Insulation is rated in terms of thermal resistance, called R-value , which indicates the resistance to heat flow. The higher the R-value, the greater the insulating effectiveness .