The attic is one of the critical locations of a house that contributes to air leakage. The air in the attics heats up, rises, and escapes outside. Attics have plenty of spaces for the air to escape, such as space around chimneys, poorly sealed soffits, etc. Always check whether the attic location is properly sealed and insulated. Spray foam insulation or any other insulation method can be used around the vents, chimney boxes, access panels, attic hatch, and electrical boxes.