What drives the decision
Use actual quoted project cost and product warranty rather than generic prices.
What changes the budget
Cleaning is usually modest, while damaged panes or tenant changes can create localized replacement.
Operations and lifecycle
A film project may be less attractive if major façade replacement is already planned.
Planning boundary
Model multiple scenarios because service life and energy outcomes are building-specific.
Educational planning only. Actual construction, code compliance, regulated systems, hazardous materials and safety-critical work require qualified professionals and current local requirements.