474. CO Alarms and Sour Smell for Heating

28 Jan 2026 · 2 min
Episode

28 Jan 2026 · 2 min

0:00

Episode 474 of the Derek Cole Podcast answers listener HVAC questions: a sour/mildewy smell when heating starts is caused by bacteria on the evaporator coil or in the condensate/drain pan and should be treated with UV lights and drain-pan treatments; carbon monoxide (CO) safety guidance stresses having CO detectors (one per living level and in sleeping areas) placed at floor level rather than ceiling height and shutting off furnaces with cracked heat exchangers due to CO risk. The episode includes host closing calls-to-action promoting healthier home air and simmons1hour.com.

Questions this episode answers

Bacteria on the evaporator coil or in the condensate/drain pan.

Use UV on the coil and apply a drain-pan (pan) treatment to kill algae/bacteria.

At floor level on the wall (near floor outlets); ceiling placement is acceptable for smoke but not effective for CO.

One in each living level and in living/sleeping spaces (multiple detectors for different sides of a single-story house).

Shut the furnace off because a cracked heat exchanger can allow CO to enter the living space; treat as a safety hazard.

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