What is the box on my ductwork? A whole house humidifier
A box with a power cord and a little screen mounted on your ductwork is usually a whole house humidifier. In winter your heat dries the air out, and this puts moisture back into the air as it leaves the system, so every room gets it.
5.0 stars across 1,130 reviews
Get your price in writing
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
Rather talk now? (703) 997-9757
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceWe answer day or night, and we will tell you honestly when we can get there.
Our own HVAC installersA dedicated heating and cooling team, separate from our plumbers
Price in writing firstYou see every option priced before anything is ordered
From one of our jobs
A whole house humidifier above a heat pump
Right now: Check the setting on the humidistat. Around 35 to 40 is right for most winter days; if the windows fog up inside, turn it down.
This one sits on the duct right above the heat pump unit, with its own power and a water line. It only runs when the heat runs and the humidity in the house drops below what it’s set to.
Set it around 35 to 40 on most winter days and lower on the coldest nights, or the windows sweat. Most need a new pad or a cleaned canister once a season, which is the part that gets forgotten.
Quick answers
What people ask about whole house humidifiers
What does a whole house humidifier do?
It adds moisture to the air your heat blows out, so the whole house stays comfortable instead of dry. Fewer static shocks, less dry skin, happier wood floors.
What should I set my whole house humidifier to in winter?
Around 35 to 40 on most days. Drop it when it gets very cold out, or you’ll get water on the inside of your windows.
Why is my humidifier not working?
Usually a worn pad, a clogged water valve or the water supply turned off. Check that the heat is running too, since it only works when the heat does.
How often do you change a humidifier pad?
Once a heating season for most homes, more often with hard water. A crusty white pad isn’t adding much moisture anymore.
Who installs whole house humidifiers in Northern Virginia?
Call SwiftPro at (703) 997-9757. We install, repair and maintain whole house humidifiers across Northern Virginia.
Seeing this at your house?
Tell us what you’re seeing. We’ll tell you what it is and what the fix costs, in writing.
What it costs
What we charge to check your heat and humidifier
More real photos from our jobs
Seeing this at your house?
Want us to take a look at yours?
Tell us what you’re seeing. We’ll give you a time and a price in writing before any work starts.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
Virginia Class A contractor license #2705192276