How to Stop Air Leaks and Prevent Heat Loss

Air leaks account for a significant amount of a home's heat loss in winter – resulting in increased heating costs as your furnace constantly tries to replace the warm air that has escaped from your home. Fixing these leaks will save you money on your heating bills.

To stop leaks around windows and doors:

  • Remove the trims carefully.
  • Fill large cracks or gaps with foam backer rod, oakum, or expanding polyurethane foam.
  • Replace the trims and caulk along the edges.

To stop leaks along baseboards:

  • Caulk along the seams without removing the baseboard.
  • Remove the baseboard and caulk between the wall and the floor.

To stop leaks around electrical outlets on outside walls:

  • Turn off power to the outlet and remove the outlet cover.
  • Install a foam insulating pad.
  • Replace the outlet cover turn the power back on to the outlet.

To stop leaks in an unfinished basement:

  • Caulk under the basement sill plate and around the joists with a rubber–based caulking or acoustical sealant.
  • Caulk any gaps where ducts enter a wall or ceiling.
  • Insulate ducts with preformed wraps or duct–taped insulation batts.

To stop leaks in your attic:

  • Seal any cracks.
  • Weather strip your attic door and close it tightly.


Click here for more information about our natural gas furnace maintenance and protection plans.