Indoor comfort guides

Start with a room question, or browse all guides by topic.

Humidity readings4 guides

Where to put the meter, what the humidity bands mean, and what to check before changing the room.

Where to Put a Hygrometer in a Room and How to Read It
Choose a repeatable spot away from sun, vents and moisture sources. Read temperature and RH together, with bedroom, bathroom and basement placement checks.
What Should Indoor Humidity Be?
Learn a practical indoor humidity range for everyday rooms and what to check when a room feels dry, sticky, or damp.
Is 60% Humidity Too High in a House? What RH Means
Understand what 60% RH means, compare it with EPA moisture guidance, and distinguish a short activity spike from persistent humidity or wet surfaces.
How to Reduce Humidity Without a Dehumidifier
Start with moisture sources and outdoor exhaust. Find practical checks for a windowless bathroom, basement or power outage, and limits of fans and open windows.

A lower thermostat setting does not answer every humidity question. Separate room readings from equipment sizing.

Summer Comfort: Temperature vs Humidity
AC running but the room is still humid? Separate cooling from moisture, compare outdoor air, and decide what to check before changing equipment.
Why an Oversized AC Feels Humid
Understand why a room can feel cold and humid when the air conditioner is too large or cycles too quickly.
What Size AC Do I Need for a Bedroom?
Estimate bedroom air conditioner size from room area, sun, ceiling height, sleepers, and comfort symptoms.
BTU to Square Feet Chart for Room ACs (ENERGY STAR)
Look up 100–2,500 sq ft in the ENERGY STAR room AC chart. See a 10x10 room example, shared-boundary rules and when the baseline needs adjustment.

Compare room air with the surface where water appears. A room humidity reading cannot supply a missing glass temperature.

Indoor Humidity in Winter: Find Your Range
Balance dry winter air with cold-window condensation. Use calculated window scenarios, a settled room reading and a repeatable checking routine.
Raise Humidity Without a Humidifier
Check dry-room readings before adding water. Compare modest changes, avoid steam and open-flame shortcuts, and stop if windows become wet.
Why Are My Windows Wet Inside?
Check which side of the window is wet, what to do first, and when room humidity cannot explain the water. Includes dry-air and cold-glass questions.
Dew Point in a House: Window Fog and When to Ventilate
Compare room dew point with a measured window surface, understand condensation-resistance ratings, and check outdoor dew point before ventilating to dry a room.

Look at repeated readings, visible water sources and product conditions before choosing a capacity class.

Ideal Basement Humidity Level
What should basement humidity be? Compare RH ranges, repeated readings and moisture clues before choosing ventilation or a dehumidifier.
When Does a Room Need a Dehumidifier?
Decide whether repeated high humidity means you need a dehumidifier, better source control, or a closer moisture inspection.
Dehumidifier Size Chart: 30, 35 and 50 Pint Ratings
Compare ENERGY STAR capacity bands by area and dampness, understand 30, 35 and 50 pint labels, and check older versus newer rating methods.

Compare temperature, relative humidity and calculated dew point. Two readings describe a difference, not a diagnosis or a proven cause.