Whether you're looking for new units to outfit an addition or replacements for your existing windows, the experts at This Old House sort through the options to simplify your search
Units slide on plastic tracks mounted to existing side jambs.
Pro: Least expensive option. Neither trim nor opening size is affected. Installs from the inside.
Con: Available only as double- or single-hungs. Requires exact measurements for sill angle and window opening. Existing frame must be square and solid.
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