You have reached the cross road of HVAC systems, if your home is more the 5 years old, it predates the 2012 energy code, if the codes where even being enforced which means your hvac equipment maybe sized like the wild wild west, and compromising your comfort. So you have two chooses, one swap out "the boxes" furnace and/or Air conditioner or get a comprehensive audit and size equipment properly to improve your comfort!
Air filters
Aprilaire air filter
energy Recover ventilator
ERV Energy Recover Ventilator
Humidifiers
Aprilaire humidifier is the best in the market with the Autotrak controller
Dehumidifiers
Homes that are tight may need a central dehumidifier to keep the home