⌂HouseSymptomsHOUSE INTELLIGENCE

12 complete symptom paths42 guides and 60 questions in each 1,460 Grade A articlesOne searchable, connected knowledge library 140 official sourcesEvidence context with explicit limits

HouseSymptoms field intelligence

Symptoms

Start with the visible, audible, physical or measurable sign—not the name of the fault.

Whistling at an air vent

A high tone is produced at a grille or filter area.