I have experience with allergies and air cleaners that I would like to pass along so hopefully I can save someone else some money. My wife and I had all types of allergy symptoms such as runny nose, watery eyes, and sinus headaches. We purchased a HEPA room cleaner and it collected alot dust but didnt do a whole lot for the air. A friend mine is a heating guy and he told me that a room cleaner will pull some of the dust from the room, but the dust will average out through the home over time. A room cleaner will never keep up with the dust in the home. You would have to spend a fortune for a room air cleaners and spend your entire day cleaning them all.
I then purchased 3 Ionic Breezes. The air smelled clean. My same heating contractor friend told me that a IONIC air cleaner produces Ozone which gives you that fresh rain smell. Ozone is also a lung irritant. That is why when there is ozone alerts, those with respiratory problems are told to stay inside.
He finally recommended that I put a HEPA/air exchanger that cleans the the air in the whole house. He put in a Broan HEPA/air exchanger and we could smell the fresh air right away. The outside air and inside air is filtered through the HEPA filter. The temperature is changed in the core of the unit so the humidity in the home is maintained at the optimum level so that mites and mold doesnt grow and it is comfortable for humans.
It works great. After a few days, our allergy symptoms began to go away. No more cleaners or pills.