Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Leave Running? I had an air filter that was best left on all the time.  Do you do the same with this one or not?  I'm guessing NOT.
Document: I have been looking for a good air purifier for months. I have shopped and read reviews on all makes and models. This is the one I bought, if fact I bought 2. They have been running non stop for a month now and doing great. I have 11 indoor cats and a husband who says he's allergic to cats. So I needed a good system. These 2 systems take care of my whole house. I also put the best whole house filter on my air conditioner system to help out.
I keep it on all the time. When I'm at the studio, I have it set to the lowest setting and I find it's fairly quiet at that setting. When I leave for the day I turn it on full blast. At full blast it's kind of noisy.
The filters are supposed to last 2-5 years, depending upon the elements in your home. In addition to the unit having a warranty, the filter also has a warranty and depending upon how long your filter lasts determines the discount you receive on the replacement filter. The shorter the time, the bigger the discount on a replacement filter. Overall, I'm very pleased with the product and will be watching for another sale on it as I would like to get a second one for my basement.
2nd purchase for bedroom almost silent running  on low noisy on high seems to do the job and probably should have got larger one as room is 24x16 but it easily does the job on medium speed. very very fast shipping.......however look for best prices on internet as they all seem to be drop-shipped from buffalo.
I didn't realized that the air I was breathing in the house could be perpetuating the problem.Over time, my wife made several comments about being able to breath easier. I couldn't believe that an air filter could make that big of an impact. As her lungs seemed to be less of an issue, we got lazy with using it and often left it in the bedroom instead of rolling it into the living room.
This item came damaged, but amazon always takes care of you. But for the short time we had it (I still need to buy the replacement) we could tell a difference. Since its been gone we can feel the difference in our lungs, and with the amount of dust in our home. Worth the price, just a little louder than I wanted. That is the biggest reason why I have not bought a replacement, I'm not sure I wanted to hear it running for the rest of my life.
The primary reason my husband I bought this product was to clean the air in our home from the dog odor that seemed really hard to eliminate with traditional cleaning. We've had this product for a year now and have LOVED it from the beginning. Right away we noticed that the dog smell in the air was practically eliminated when we leave the unit running.
They are at an angle and are loose. This unit seems like it is a second hand one and have been repaired. I'm not satisfy with the merchant MoreQualityLessMoney. They are trying to sell people used and broken units as new.Update: 6/16/11I have received another unit from a different merchant. This time it is from Hard to Find Items. Again I am disappointed with the quality of the product.
Yes, this air purifier is expensive. At the same time, it does an excellent job dealing with pet dander and regional allergens in my case. One thing to factor in is that the expected filter life for this air filter under normal use is 5 years. So while the initial investment is high, if you use it normally you wont have a yearly filter to purchase.
My wife is a teacher and has had a chronic cough for years, but only during the school year. We put this in her classroom, and it solved the problem completely. This baby has been running for two years without having to change the filter, and my wife is still cough free! LOVE IT!!! I'm sure we'll need to change it soon, and the filters can be pricey, but even if they cost $300 this product would still be worth it to me.
Answer: The Austin Air FAQ states: "Yes, Austin Air cleaners were designed and built for continuous use.  In fact, Austin Air encourages customers to leave their air cleaner on at all times to achieve the healthiest living environment possible." I keep mine running 24/7.