12 complete symptom paths42 guides and 60 questions in each1,460 Grade A articlesOne searchable, connected knowledge library140 official sourcesEvidence context with explicit limits
Operating cycles

Heating, cooling and ventilation observatory

Trace air, heat, condensate, pipes and equipment cycles that create repeating sounds, odors and moisture.

Active system layer Airflow pathways

Trace pressure, leakage, supply, return and exhaust paths that move heat, moisture and odors.

8scenes49hotspots28simulations36reactions
Air layer activeChoose a numbered hotspot to inspect the route.
01
Selected clue point

Supply air path

Conditioned air, distribution and room mixing.

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The Living House method

Same building. Different hidden stories.

01Choose the location02Switch the system layer03Follow a plausible pathway04Verify against the real house
Failure simulations

Watch the pathway unfold

Each simulation separates trigger, transport route, visible symptom and verification.

All simulations in this scene →
Material Reaction Lab

See what the layer does to the material

Materials record exposure differently. Their response can reveal a pathway without proving the source.

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Take the observation back to your house

The diagram suggests routes.
The real trigger decides.

Describe what changed, where it happened and what weather or operating cycle came first.