What should indoor humidity be in winter?
Aim for 30–40% in winter — slightly lower than the summer target, since colder outdoor air holds less moisture and pushing indoor humidity too high can cause condensation on windows.
How do I measure humidity in my home?
A hygrometer is the simplest tool — inexpensive digital versions are widely available and give a real-time relative humidity reading. Many smart thermostats also include a humidity sensor built in.
Does air conditioning increase or decrease humidity?
Air conditioning decreases humidity as a natural side effect of cooling — the process removes moisture from the air as it passes over the cold evaporator coil, which is why AC helps with muggy summer air.
Should I run a humidifier and my HVAC filter at the same time?
Yes — they solve different problems and work well together. Just keep the humidifier's own filter or wick clean, since a neglected humidifier can actually introduce mold or mineral buildup into the air.
Why does my house feel humid even with the AC running?
An oversized AC unit can cool a room quickly without running long enough to remove much moisture, since dehumidification happens gradually over a longer cooling cycle. A clogged filter restricting airflow can have a similar effect.
