Indications of Substantial Humidity A humidity meter or hygrometer is more definitive, but specific indicators in the house and physically felt in your body can point to bigger humidity stages. Clogged or dirty filters will impede airflow, lowering your HVAC's usefulness. Clear or replace the furnace and air conditioner filters https://www.penmann.co.uk/blog/industrial-dehumidifiers-managing-moisture-in-controlled-environments/