The Whirlpool Whispure True HEPA Air Purifier tends to cost a little bit more than most air purifiers. Despite the cost, which typically ranges around 0, you need to remember one thing. The air purifier and air cleaner filter are designed to clean the air in rooms up to 510 fit feet. Most of the low-costing air purifiers can only pure the air of rooms with 200 to 300 square feet. In addition to the original purchase price of the Whirlpool Whispure True HEPA Air Purifier, you also need to consider the cost of the replacement filters. These replacement filters cost around 0; however, replacement filters are only needed about once a year.