Windows require maintenance. Broken or leaking window seals lead to drafty windows and excessive energy lost and cost. If you notice excessive moisture on window glass during the colder months, this is a sign of heat loss. The humidity will cause water to pool and collect on windowsills which can lead to further damage. If you want to test windows for leaks, burn an incense stick near the joints and connections. You have an air leak if the smoke flickers.
The warm summer temperatures can cause exterior caulk to dry out and lead to gaps and cracks. Prior to applying new caulk, remove as much of the old caulk as possible. Be sure to caulk the window where it meets the exterior siding. If wood trim surrounds the window, we recommend a high-grade polyurethane caulk to seal gaps between the trim and the siding and between the trim and the window.
Another maintenance requirement is to replace the window glazing. If a pane of glass rattles when tapped, you should replace the putty to obtain a better seal. You should also remove any hardened glazing that flakes away easily and then clean the surface prior to applying the glazing.