When you buy an air cleaner, you need to look for beneficial features appreciate a warranty. An air cleaner with a warranty has an after-repair offer that guarantees the product will last for the said number of years. In case it fails, you can claim a replacement! Some Heating and A/C contractors may offer an air cleaner warranty when installing the whole apartment air cleaner, while others only guarantee air cleaner components. For you to get the most out of your air cleaner, you should also look out for its HEPA filtration. Size compatibility is also important as air cleaners are more effective when they are compatible with the room size. Consider buying a model that will be effective in a bigger room since the air cleaner can still operate in lower settings as well as be effective, thus saving you energy. Opt for an air cleaner that can be effective even when set to be at the lowest noise level. A purifier’s clean air delivery rate(CADR) signifies its overall cleaning speed to clean dust, smoke, as well as other pathogens from the air, but use a purifier with a CADR of 300 to 400 for average room sizes. The number of times the air in the room is changed in a room should be frequent enough to guarantee its efficiency. An allergic or asthma-prone person should opt for purifiers with at least multiple times or 5 times air change per hour rating, but whenever you buy an air cleaner, make sure that it has all those features as the warranty covers it all.