Ask anyone who services heating and cooling where the problems live and the
answer is the same: rarely in the equipment, almost always in the loop around it.
Comfort is a loop, not a box. And most failures live in the loop.Six places a system gives way. Five of them are the loop, not the box.
A river-valley summer that gives every air conditioner a second job — drying
the air, not just chilling it. Winters that ask heat pumps to work below
freezing and furnaces to wake from months of idleness on the first cold
night. Ducts running through vented crawl spaces, leaking where nobody looks.
And whole subdivisions of same-year builder equipment reaching its decisions
together. Most of what ends a system here traces back to one of those.