How can I purify the air in my house to relieve my allergy symptoms?

HEPA filters. High efficiency particulate air filters are the best way to initially help. Buying additional portable air purifiers could also help. Keep the dust and pet dander to a minimum since this plays a big role.
Filters. One thing that you can do is upgrade your hvac filters. Most filters are merv 8 but a filter with a higher merv number (i.e. 10 or 11) will remove smaller particles more effectively. If you have an unusual problem like a shedding indoor amimal or an old air- leaky home, stand-alone hepa filtration systems are available. Make sure you check-our replacement filter costs before you invest.