You build it out of their discovery answers — all of them. Their problem frames which products get shown, their hot button sets where the time goes, their exact words introduce the benefits, and their desired outcome is the picture the whole presentation points at. Personalization is not using their name and their town; it's making the presentation impossible to give to anyone else.
The short answer
The test is mechanical: for each part of your presentation, name the discovery answer it answers. The draft problem they described opens the window section. The last contractor's failure opens the company section. The daughter's cold room is why this benefit gets five minutes and that one gets thirty seconds. A section that answers nothing they said is a section from the generic deck — and homeowners can feel generic the way they can feel a form at discovery.
How it runs
By presentation time, the personalization is either already collected or it doesn't exist — there is no improvising it at the table. That is why the pre-presentation check exists: problem, history, why-now, decision process, hot button, outcome, criteria. Two homeowners can choose the same project for completely different reasons, and the rep who presents both reasons at equal volume to both households has personalized for neither. Personalize the emphasis, the language, and the proof — the product can stay the same, because the product was never the variable. The people are.
Go deeper
Spar's rounds put a homeowner across the table while you present — graded against the system. Round 1 is free; the full camp is $29/month. Spar before you knock.