Replacing at a High Floor: Why We Staged It by System

A living and dining area that has gone warm and stayed warm, while the bedrooms still cool normally. Both sets of equipment went in with the original fit-out and neither has been replaced. A single price covering both has already been proposed.

Two systems of the same age can sit in completely different condition. Each is tested on its own terms rather than judged by a shared install date. A full cooling check on each, then a measurement of what each draws to hold the same temperature. The one that has aged badly shows in both numbers. The one that has not shows in neither.

Exposure and duty do the ageing, not the calendar. A ledge is rarely uniform: one end takes sun and driven rain while the other sits shaded, and the areas they serve are occupied for very different hours. Over a decade that gap compounds until one system is finished and its twin is mid-life. They will always share an install date and they stopped sharing a condition years ago.

Replace the living area system and leave the bedroom system in service. Doing both together scraps working equipment to save one round of ledge access, and that access is a modest line beside the price of a second system. Worth saying plainly is when the second one comes: measured, not guessed, at the point its own numbers move rather than at the point the first one was replaced.