Most air purifiers have notifications that tell you when it's time to replace the filter. The HEPA filter in mine needs to be changed about once a year, but other filters may require less frequent maintenance. It's best to follow the manufacturer's instructions to ensure optimal performance. The frequency of filter changes depends on the type of purifier and how often it is used.
Some filters are reusable and washable, but they require a lot of upkeep and are not usually found in the most effective air purifiers. Reusable filters are good at removing larger particles from the air, such as dust mites and pollen. You can also find UV (ultraviolet) filters on the market, which claim to destroy biological impurities like mold or bacteria, but they need more power and longer exposure to be effective. Some bacteria are even resistant to UV light. It's important to remember that HEPA filters, which are the most common type for air purifiers, trap particles throughout the fabric, not just on the surface.
If you want to use your air purifier in multiple rooms, look for a smaller device or one that is easy to move around. The filters are designed to last five years, so the replacement cost doesn't take into account the first five years of ownership. Many air purifiers have different modes that you can choose from, such as a higher fan speed for maximum cleanliness or a deep cleaning cycle before bedtime. When shopping for an air purifier, always check the CADR ratings and filter types first to make sure it meets your needs. The Winix 5500-2 is a great option because it has a nearly identical Clean Air Delivery Rate (CADR) and offers 5.1 Air Changes Per Hour (ACH) in a 350 square foot space.
ACH refers to how many times an air purifier can filter all of the air in the treatment space every hour. Portable air purifiers are usually designed for one room only, so you may need additional units for other rooms. If you notice dust and particulates around the air purifier vent, it's a sign that the filter is overloaded. Some models like the Austin Air HealthMate HM400 can reach noise levels of more than 60 dB (similar to an air conditioning unit 100 feet away). To avoid this problem, look for an air purifier with a filter replacement indicator built into the control panel.
The Dyson Pure Hot+Cool HP04 is a great choice because it combines a heater and purifier and can move more air than the TP04 model.
