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Air Quality

Summer Humidity: Why the House Feels Clammy

A cool house that still feels sticky has a humidity problem, not just a temperature problem. Here is why and what helps.

ABBy Ansel Brigham, Comfort Notes Editor

On a muggy July day in Providence, you can set the thermostat to 72 and still feel sticky. That is because comfort depends on humidity as much as temperature.

Hygrometer reading high humidity on a window sill on a muggy summer day
Air Quality: Summer Humidity: Why the House Feels Clammy.

How air conditioners remove moisture

As warm air passes over the cold indoor coil, moisture condenses and drains away. But that only happens while the system is running long enough for the coil to stay cold and wet. Short runs cool the air without drying it.

Why oversized systems feel clammy

An air conditioner that is too large cools the house quickly and shuts off before it has removed much moisture. The thermostat is satisfied, but humidity stays high. A properly sized system runs longer, steadier cycles and dries the air as it goes.

The shoulder seasons

In late spring and early fall, days can be mild but very humid. The AC barely runs because the temperature is fine, so moisture builds up. This is where a whole-home dehumidifier helps, since it runs on humidity rather than temperature.

Basements make it worse

Stone and block foundations common in older Providence homes let moisture into the basement, and that damp air spreads through the house. Fixing gutters and grading outside, then running a properly drained dehumidifier inside, makes a big difference.

  • Aim for 40 to 50 percent indoor humidity in summer.
  • A simple hygrometer shows where you stand.
  • Set the fan to auto, not on, so the coil can drain between cycles.
Need a hand with this?

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Services mentioned in this note

Whole-Home Dehumidifiers

Ducted dehumidifiers that hold summer humidity near 50 percent without portable units to empty.

How we handle it

AC Installation

New central air on existing ductwork, sized by a cooling-load count with a matched indoor coil.

How we handle it

Indoor Air Quality Testing

Humidity, particles, carbon dioxide and carbon monoxide readings with a plain-language report.

How we handle it

More Comfort Notes

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