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BobVila.com > Channels > HVAC > All Tips > Adding Insulation Install additional attic insulation at right angles to the previous layer. You don't have to use the same type of insulation - it's fine to use batts or blankets over loose-fill, or vice versa. Upgrading from three inches to 12 inches can cut heating costs by 20 percent, and cooling costs by 10 percent. Related Showrooms A.I.M. Radiant Heating - Clean, Quiet, Efficient Heating SprayFoamDirect.com - Do It Yourself Spray Foam Insulation EdenPURE - Portable Home Heating Sears - Heating & Cooling Repair |