Home › Common Problems › Poor Indoor Air Quality and Allergy Symptoms
Poor Indoor Air Quality and Allergy Symptoms
in Sioux Falls, SD
Sioux Falls winters mean windows stay shut for 5 or 6 months straight. That means whatever is in your ductwork gets recirculated through the house constantly with no fresh air to dilute it. Dust mites, pet dander, mold spores, and construction debris from older homes all accumulate in ducts and get blown through the house every time the furnace runs.
Quick Answer
When ducts are full of dust, pet dander, and mold spores, your HVAC system turns into an allergen delivery machine. In Sioux Falls, homes are sealed tight from November through March, so whatever is in the air inside stays inside and keeps cycling through dirty ducts. Cleaning the ducts reduces the load of particles in the air. Call (605) 250-4261 if symptoms are worse indoors than outside, especially in winter.
Telltale Signs
Warning Signs to Watch For
- Family members have runny noses, itchy eyes, or coughing that is worse at home than anywhere else
- Symptoms improve when everyone leaves the house for a day or two
- Symptoms are worst in winter when the furnace runs constantly
- You can see dust floating in sunlight near the vents when the system runs
- Pet owners notice symptoms year-round even during allergy season gaps
- Recently renovated areas of the house seem to make symptoms worse
Root Causes
What Causes Poor Indoor Air Quality and Allergy Symptoms?
Pet Dander Buildup in Duct System
Pet dander is light enough to float in air and gets pulled into return vents, where it sticks to the duct walls. With the house sealed up tight through a Sioux Falls winter, dander builds up in the ducts and gets redistributed constantly. Homes with multiple pets can accumulate a heavy dander coating inside the ducts within one heating season.
The Fix
Full Duct Cleaning with HEPA Vacuuming
A cleaning using a vacuum with a HEPA filter removes the dander without releasing it back into the house during the process. Combined with regular filter changes, this keeps dander levels manageable.
Construction Dust Trapped in Ducts
Remodeling work in Sioux Falls homes — even just drywall sanding in one room — pushes fine particles into the return air system. That dust contains silica and other fine particles that standard filters don't fully catch, and it coats the inside of ducts where it stays until cleaned out.
The Fix
Post-Renovation Duct Cleaning
A thorough cleaning after any major renovation removes the construction dust before it becomes a permanent part of the duct interior coating. This is especially important in homes built before 1978 where older materials may be present.
Mold Spores from Humid Ductwork
Mold growing inside ducts releases spores into the airstream constantly. In Sioux Falls, attic and crawl space duct runs can stay humid long after a wet summer, giving mold a long window to produce spores that get blown through the living areas.
The Fix
Mold-Focused Duct Cleaning and Treatment
Technicians remove visible mold growth and treat the duct interior with an antimicrobial agent. Addressing the moisture source is also necessary to stop spore production from resuming.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Pet Dander Buildup in Duct System | Construction Dust Trapped in Ducts | Mold Spores from Humid Ductwork |
|---|---|---|---|
| Symptoms improve immediately after leaving the house | |||
| Symptoms are worst in rooms with pets sleeping nearby | |||
| Symptoms started or got worse after a renovation project | |||
| Musty smell accompanies the allergy symptoms | |||
| Symptoms are worst in winter when the house is closed up |
Free Inspection
Get a Diagnosis in Sioux Falls
An on-site inspection is the only way to confirm which cause applies to your property. Free, no obligation.
(605) 250-4261Free on-site inspection
Written estimate before work starts
Serving Sioux Falls & surrounding areas
Other Problems
Services That Fix This
Also Helpful