- Unusual and noticeable odors, stale or stuffy air
- Noticeable lack of air movement
- Dirty or faulty central heating or air conditioning equipment
- Damaged flue pipes or chimneys
- Unvented combustion air sources for fossil fuel appliances
- Excessive humidity
- Tightly constructed or remodeled home
- Presence of molds and mildew
- Health reaction after remodeling, weatherizing, using new furniture, use of household or hobby products, or moving into a new home
- Feeling noticeably healthier outside the home
. Questions of a Do It Yourself nature should be submitted to our "