So, elsewhere on these blogs I suggest using washable filters in your HVAC system to save money on filters and improve airflow. To effectively remove allergens from the air, put one of these in your bedroom. We run ours on high during the day and low at night. This model is known for being quiet. No point breathing well and being kept awake by the noise! Filters only have to be replaced annually. Keep the bedroom door shut. Also, lose the carpet and put allergen covers on your pillows and wash pillows every six months. Click on image for link. Sweet dreams of mountain air!