Westminster's houses rarely match their original floor plans. A city of families growing in place converted its garages, enclosed its patios, and added primary suites for parents, one permit, or sometimes none, at a time. The walls moved. The duct systems mostly did not. A trunk sized for a three bedroom ranch in 1962 now feeds five rooms, and the two it feeds worst are the two that were added, which are usually the rooms someone sleeps in.
That history explains the city's signature complaint, a house that is comfortable except where it matters, and its signature waste: replacement condensers bought to fix an airflow problem. Air cannot be pushed through a run that was never sized, at any tonnage. The diagnostic that respects the house is the register by register read, which takes an hour and prices the actual fault: sealing, a resized run, or a ductless head for the room the ducts cannot honestly reach.
The planning lesson travels with the house file. When a Westminster home changes hands, the addition's heating and cooling deserve the same scrutiny as its roof: how is this room served, by what run, at what measured airflow. Sellers who can answer with numbers sell a system. Everyone else sells a complaint the buyer will discover in the first heat week.
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