From the exterior, the installation joints between the windows and doors can be inspected and repaired as needed. Damaged trim and sealant can be removed and replaced. From the interior, applying narrow beads of sealant at the joints between window and door frames and adjoining interior wall surfaces can greatly reduce air leakage at these locations. Building occupants may be aware of problem areas that need attention, and sealing all such joints is a relatively inexpensive task. Side hinged doors are often characterized by significant air leakage, whether due to worn or faulty weather seals, or warping of the door slabs. Unlike windows and sliding doors, these products use fairly standard interchangeable components. Generic weather seals in the door frame can be easily replaced, and retrofit mouldings with flexible contact surfaces can be installed to follow the profile of a permanently warped door sash. Adjustable door bottom weather seals are also easy to replace.

Dealing with air leakage between the fixed and operable portions of windows and sliding doors is more challenging. Depending on the age of the product, replacement seals may be difficult or impossible to find. Sometimes the air leakage is due to swinging sashes that don't close properly due to sagging or worn bar hinges, or worn out roller assemblies for sliding sashes. Replacement parts can be hard to come by, and some problems cannot be affordably repaired. In these cases, replacement of the window or sliding door is usually necessary.