I have the worst type of allergies. I am allergic to all kinds of pollen and I am highly allergic to house dust. House dust causes me to have symptoms that are worse than when I had the flu. The only difference is that with the flu I had nausea and diarrhea. One of the things that helps with my allergies, is when I change the air filters more often. I was changing the air filters about once a month, but I had to change that time. I realized that if I changed the air filter every couple weeks, my allergies would be less severe. The air filters help to take out the dust,, dirt and pollen, before it is able to get into the house. When the air filters get too full, they aren’t able to remove as much dust and dirt from the air. I was looking online one afternoon, and I started reading about HEPA air filters. I was beginning to wonder if the HEPA air filter wouldn’t be a better option for me. I went online and I found a place where I could purchase the HEPA air filter. I couldn’t believe the difference they made in my HVAC system. My air was cleaner than it had ever been. I even had comments from my family about how good my air quality was. I found that the HEPA air filter was much more expensive than my regular air filters. I was worried about the cost. I went online and I found a coupon where I would only need to pay half the price if I bought a full case of the HEPA air filter.