We get asked this a lot, so here we're trying to explain as concisely as possible why zoning is often a symptom of a badly built home enclosure (or a poorly planned McMansion, obviously). If heat is bleeding through the skin of a home at a controlled rate in every room, there's no need to zone the HVAC system to give special attention to a weak link. There are no weak links in a well-tuned home enclosure, and so your HVAC system can be simpler with fewer components, and more sure to effectively condition the home.
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