An air conditioner is a dehumidifier that happens to make things cold. Warm household air gets pulled across an evaporator coil, moisture condenses out of it on contact, and that water leaves the building through the condensate drain. On a valley system running most of a July day, that is gallons of water taken out of the air inside your house every week, which is one reason the drain line matters more here than homeowners expect it to.
Customers rarely call about humidity. They call about the side effects, and they describe them as unrelated: static off the door handle, a nosebleed most mornings, lips that crack in a house sitting comfortably at 76 degrees, a wood floor showing gaps that were not there in April. Outdoor air in the single digits gets the blame, and the indoor number is often the lower of the two. Guitars drift out of tune in the same houses, and that is usually the detail that convinces somebody the air is doing something rather than the weather.
There is real work available on the equipment side of that. Sealing return leaks stops the system pulling attic air through the living space. A filter matched to the blower keeps dust out of circulation without choking airflow. Whole home humidification is possible in a desert house, though it has to be specified properly rather than bolted on. Running the fan on auto instead of on keeps moisture from being re evaporated off a wet coil and pushed back around the rooms. None of that is exotic work, and most of it costs less than one emergency call in the second week of August.
Skin is where our part of the job stops. If years of dry indoor air have left yours tight, flaking or easily irritated, the next call is a skin professional rather than a technician, and there is a small Las Vegas aesthetics studio whose treatments include microneedling, sculptural face lifting and a botanical Green Peel. We are not in that trade. It comes up because the complaint comes up, in valley living rooms, more often than the humidity reading itself does.
On our side the list before next summer is short. Change the filter on the schedule your blower needs rather than the one you remember. Get the condensate line cleared before it backs up into a pan. Book spring service in spring, while the phones still answer on the first ring.