High Humidity in House? Causes & Solutions

Excess indoor humidity makes your home feel hotter than it is, promotes mold growth, damages wood and furnishings, and affects your health. Proper humidity control is essential for comfort.

Call (650) 397-7060 Schedule Diagnosis

Signs & Symptoms

!Clammy, sticky feeling indoors

!Condensation on windows

!Musty odors

!Mold or mildew growth

!Warped wood floors or furniture

!Peeling wallpaper or paint

!Increased allergy symptoms

Possible Causes

-AC system oversized (cools fast but doesn't dehumidify)
-AC not running enough to dehumidify
-Poor ventilation in bathrooms/kitchen
-Foundation or crawl space moisture
-Air leaks bringing in humid air
-No whole-home dehumidifier
-High outdoor humidity (Bay Area summers)

DIY Troubleshooting Steps

Try these steps before calling a professional (unless it's an emergency):

1Use exhaust fans when cooking/showering
2Run AC longer (don't set temp too low)
3Use portable dehumidifiers
4Check for plumbing leaks
5Improve ventilation
6Open windows in dry weather

When to Call a Professional

!Humidity over 60% despite efforts
!AC may be oversized
!Need whole-home dehumidifier
!Moisture intrusion from foundation
!Ductwork issues suspected
!Want integrated humidity control

Estimated Repair Costs

Diagnostic: $89-$150

Minor Repair: $200-$500

Major Repair: $1,500-$3,500

Adjustments and portable units are affordable. Whole-home dehumidifiers are a larger investment.

Prevention Tips

* Properly size AC during replacement

* Always use exhaust fans

* Monitor humidity with hygrometer

* Address water intrusion immediately

* Consider whole-home humidity control

Frequently Asked Questions

Why is my house so humid even with AC running?

An oversized AC cools air quickly but doesn't run long enough to remove humidity. Other causes include inadequate ventilation, air leaks, or foundation moisture. A whole-home dehumidifier may be needed.

What's the ideal indoor humidity?

Aim for 30-50% relative humidity. Below 30% causes dry skin and static; above 50% promotes mold growth and dust mites.

Need Help?

Our technicians can diagnose and fix this issue. Same-day service available.

(650) 397-7060 Schedule Online

* 15+ Years Serving the Bay Area

* Same-day diagnosis available

* Upfront pricing

Related Services

High Humidity Indoors Repair Near You

Oakland Berkeley Alameda San Leandro Hayward Fremont Pleasanton Walnut Creek Concord San Francisco Richmond Union City

Experiencing High Humidity Indoors?

Our expert technicians can diagnose and fix this issue quickly.

Call (650) 397-7060