Gather temperature and humidity together
Use a humidity meter in affected rooms and record readings alongside room temperature, settings, weather, and cycle length. Keep the meter away from a vent or obvious moisture source.
Note open windows, a running humidifier, and moisture-producing activities. Is the complaint throughout the home or limited to one space?
EPA recommends measuring humidity and controlling moisture, generally below 60%, ideally 30-50%. That is not a diagnosis or a guarantee that one reading makes every home safe. EPA indoor-air guidance.
Check the operating arrangement
Ask the installer to confirm the outdoor unit, indoor unit, coil, and thermostat combination. Request the intended cooling sequence, measured airflow, and model-specific humidity controls.
A variable-speed label does not establish which low-output or humidity functions your controls support. Ask whether the intended functions were enabled and tested.
For example, Trane's outdoor Owner's Guide discusses why continuous fan operation may be unsuitable in humid cooling conditions. That is an example to discuss, not an instruction to change an unidentified system. Trane owner's guide.
Do not enter installer menus or alter blower settings to force longer cooling.
Request a finding before an add-on
Have the provider compare cooling and moisture-removal needs with actual operation. Ask whether sizing, controls, airflow, drainage, or a separate moisture source needs correction.
A dehumidifier may deserve consideration if the measured need remains. Get its purpose, placement, care, and total cost explained before buying.
Your next step is to share the combined temperature and humidity record. Request a correction tied to the measured problem and a follow-up check addressing both temperature and moisture.