A persistent smell in your house is a clue, not a nuisance. The first
job is identifying what kind of smell:
Musty / damp earth: mold or mildew.
Sulfur / rotten eggs: sewer gas, natural gas (added
odor), or dying water heater element.
Decaying flesh: dead rodent, bird, or other small
animal.
Burning plastic / rubber: electrical
overheating.
Skunky / gasoline-like: natural gas or propane
leak.
Chemical / paint: VOCs off-gassing.
Persistent smoke / pet / cooking: embedded in
fabrics or HVAC system.
Each has a different diagnostic path. Don’t spray Febreze — that
masks evidence.
Your nose is the primary tool; a notebook
and a logical map of the house is the secondary tool.
Safety first: gas smells
If the smell is natural gas, propane, or unusually
sulfurous: 1. Leave the house immediately. 2. Don’t flip
switches, start cars, or use phones inside. 3. From outside, call your
gas utility’s emergency line.
Gas leaks are not diagnostic puzzles; they’re safety events.
