Maintenance efforts over time are generally

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warped, faded, or displaced frames; and
etched or fogged glass.
As glazing becomes scratched, distorted, or clouded, building occupants may complain of compromised views, along with bothersome glare that can affect daylighting schemes.

Another factor to consider is maintenance and cost control. As windows age, it may become increasingly difficult and cost-prohibitive to find replacement parts. Keeping up with the needs of older windows is more rcs data demanding, as maintenance personnel spend hours responding to user complaints. (While windows have generally become more thermally efficient,

increased the result of deterioration and failure of window components [e.g. gaskets, seals, and hardware] rather than shortcomings in the original design.) Protecting building infrastructure from environmental infiltration and chasing after damage can become a strain, and the cost of ongoing problems adds up.