Seal air leaks with caulk. Applying caulk around windows, doors, electrical wiring and plumbing can save energy and money.
Before applying new caulk, clean and remove any old caulk or paint with a putty knife, screwdriver, brush or solvent. The area should be dry before you apply the new caulk.
Apply the caulk in one continuous stream, and make sure it sticks to both sides of the crack or seam. Afterwards, use a putty knife to smooth out the caulk, then wipe the surface with a dry cloth.