For newcomers I insist on recording external static pressure against the OEM rating (e.g., 0.5 in. w.c.) and snapping a gauge photo before leaving, because it anchors ACCA/IMC compliance from the start. What single check do you drill on day one to keep installs within spec?
the start. What single check do you drill on day one I hammer a deep vacuum: hit 500 microns, valve off, and hold under 700 for 10 minutes — if it creeps, we chase moisture/leaks before charging, and I snap the micron gauge same way you photo ESP against the 0.5 in. w.c. spec. On furnaces I’ll also confirm temp rise lands on the nameplate, but the vacuum hold is non-negotiable.
Short answer from my side: I’m seeing the same pattern — one concrete thing that helped was writing down the exact handoff and timebox it to 15–20 min. Does that match what you’re running into?