How to keep the log
Short entries are fine. Consistency matters more than detail.
Pick three check times
Morning, mid-afternoon and evening are practical. Smell in the same room each time first, then the room that smells worst.
Rate the strength
Use zero to four, where zero means none and four means strong enough to leave the room.
Describe the smell in plain words
Sour, sweet, smoky, earthy, sharp, sewer-like. Short descriptions are more useful than technical terms.
Note conditions
Weather, wind, whether the heating or cooling was on, and any water use or cooking.
Review after seven days
Look for repeats. Smells that follow cooling, rain or a specific time often point to the source.
A sample row layout
| Date and time | Room | Strength | Smell | Conditions |
|---|---|---|---|---|
| Day one morning | Kitchen | 1 | Sour | Cool, fan off, dishwasher run overnight |
| Day one afternoon | Kitchen | 3 | Sour | Warm, cooling on, windows closed |
| Day two evening | Family room | 2 | Musty | Rain earlier, fan on |
| Day three morning | Basement hall | 2 | Earthy | Cool, furnace off |
Reading the pattern
After a week, sort entries by condition rather than by date. If strong scores cluster when cooling runs, the air handler becomes a leading suspect. If they cluster after rain, look for moisture in the basement or crawl areas. If they cluster in one room whatever else changes, the source is probably in or near that room.
A log also gives a provider something concrete to work from. A page of dated notes with conditions is more useful than a general description, and it helps a professional decide which tests to run first.
Do not worry about perfect scoring. Two people may rate the same smell differently, and that is fine as long as each person is consistent. If two household members keep separate logs, comparing them at the end of the week can reveal rooms where one person adapts more quickly than the other.
If you can, add a short note about what the house was doing in the hour before the entry, such as cooking, laundry, showers or a delivery at the garage. These small details are often what connect a smell to a source.
Common questions
Do I have to keep it for two weeks?
Two weeks catches weather and usage cycles. If the smell is constant, you may find a pattern sooner, but a longer record is stronger.
General information for Highlands Ranch, not a quote or professional advice. In an emergency, call 911.