A furnace does the equivalent job of a boiler in most Saskatoon homes, since forced-air heating is more common here than the hydronic boiler systems found in some older character homes. Whichever system you have, an aging or inefficient unit gets flagged as deferred maintenance during the $400 to $600 home inspection every serious buyer orders, the same way a worn roof does.
Windows work the same way: original single-pane windows read as an energy and comfort concern more than a cosmetic one, and replacing them removes that objection rather than adding a premium on top of the sale price. The exception is a full-home upgrade paired with clear energy-efficiency documentation, which some buyers will pay slightly more to avoid doing themselves.
None of this shows up cleanly in an automated online estimate, which reads the age fields on file rather than the actual condition of the roof, furnace or windows, so a hand-reviewed valuation is the only way to know whether a specific upgrade protected your price or genuinely grew it. Get your hand-reviewed valuation from Joel Dyck.