The Dry-Air Problem: Winter Humidity

Why winter air here is so dry

Colorado is dry to begin with, and winter makes it worse. Cold outside air holds very little moisture, and when your furnace heats that air, the relative humidity drops further still. The result is the familiar winter house: static shocks on the doorknob, cracked lips, a scratchy throat, and hardwood floors that gap at the seams.

Indoor humidity in a heated Front Range home often falls to 10 or 15 percent in January. For comfort and health, the target is closer to 30 to 40 percent. That gap is what you’re feeling.

What dry air costs you

It’s more than an annoyance. Dry air pulls moisture from your skin, your sinuses, and your lungs, which is why winter brings dry skin and more frequent colds. Dry sinuses are also less able to fend off viruses, so the season’s dryness and its illnesses feed each other.

Your house feels the strain too. Wood furniture, trim, flooring, and instruments shrink and crack as they lose moisture, and gaps that open in winter don’t always close cleanly come spring.

There’s a comfort-and-cost angle as well. Humid air feels warmer than dry air at the same temperature, so a properly humidified house feels comfortable a degree or two lower on the thermostat. Adding moisture can let you turn the heat down and still feel warmer.

Adding moisture the right way

For a single room, a portable unit does the job if you keep it clean. Left dirty, a humidifier tank grows mold and bacteria and then sprays it into the air, so empty and dry it regularly.

For the whole house, a humidifier that mounts on the furnace is the better answer. It adds moisture to the air as it’s heated and distributed, treats every room evenly, and connects to your plumbing so there’s no refilling. It’s a modest add-on when paired with a furnace, and it runs quietly in the background all winter.

Don’t overdo it

More isn’t better here. Push indoor humidity too high in cold weather and moisture condenses on cold windows and inside exterior walls, where it can feed mold and mildew. The 30 to 40 percent range is the sweet spot; in a deep cold snap, ease it down so the windows stay clear.

A whole-home humidifier with a good control holds that balance for you. If your house turns into a static-charged desert every winter, ask us about adding one when we’re out for your heating service. It’s one of the smaller upgrades that makes the biggest difference in how the season feels.