Mechanicals · definition
Annual Fuel Utilization Efficiency — the percent of fuel a furnace converts to usable heat over a year. 80% is mid-efficiency; 90–98% is condensing/high-efficiency.
Source: ENERGY STAR — Furnaces
Where this term lands on a Columbus budget
The cost pages carry the current local ranges, and the guides explain what moves them. A published range becomes a project number only after someone looks at the site.