It has been a few years since I had the air duct of our central heating & A/C system system cleaned. This was not a great option on our area to wait so long before getting our air duct cleaned! Because of not getting our air duct cleaned, our indoor air pollen levels had been suffering a lot. The indoor air pollen levels was getting stale & it was getting a bit dusty in our house. I knew then that it was time to call the local heating & A/C system business to schedule a certified heating & cooling specialist to come out & wash the air duct of our central Heating, Ventilation & A/C unit. Then, I also thought it may be best to invest in some kind of lower priced indoor UV air purifier. Something adore a portable whole-house air purifier I think would do the trick in cleaning the indoor air pollen levels since it was not too bad yet. It was just in the start phases of what could be a extreme air quality issue. So the heating & A/C system business came out & did the full on air duct cleaning. Then once that was done, I went to the store to buy that portable whole-house air purifier I was talking about. The portable whole-house air purifier was on sale for a little over one hundred dollars which was almost half off the correct price of a portable whole-house air purifier or any type of indoor UV air purifier; Once I set up the portable whole-house air purifier in our family room, within a few afternoons our indoor air pollen levels was good once again!