While buying an air purifier, you should buy one that claims to trap the maximum particulate matter of the smallest size in microns. A good quality air purifier will trap the dust rather than the cheaper versions which will make the particles settle down and stick to the surfaces in the room. Also, most air purifiers emit ozone gas which can cause headaches and dizziness if the person is exposed to it for a longer time. These can cause respiratory disorders in people living in that particular environment. So, always remember to buy one with the best air filter.

It is better to get separate air purifier units for separate rooms in your home or office. Their efficiency depends on smooth and uninterrupted air flow which is possible only in a walled unit. The air purifiers are available in different sizes to cater to rooms of varying dimensions. The air purifier from Living air repair should be bigger than the dimensions of the room so that it can cover the whole room effectively.

Buying a cheap air purifier today because you did not allocate enough budget for it will cost you in the long run. The filters will need to be replaced periodically and any maintenance costs which may crop up will result in you having to spend whatever money you saved initially. You should know the number of filters in the air purifier, how long they will work well and the cost of replacing each filter. You may have to spend initially on a high end air purifier but its filters may last longer and provide better service than a cheap device. You should consider the cost of filter replacement for the next 4 to 5 years and then calculate if it is better to buy a high quality filter which may cost more or to go in for purchasing a cheaper one.

Some people may need an air purifier with a smoke filter if there is a chain smoker in the house. There are other varieties of air purifiers which emit special light rays which kill bacteria and have a special filter to trap toxic gases. Sometimes people have allergies to glue and other chemicals which are used in household appliances. They can buy special air purifiers which are assembled without the use of these chemicals and are safe for people who are prone to these allergies. In case you or someone in your family has any special requirements like the ones mentioned above, you can ask for the air purifiers specifically made for this purpose. 

You should consider buying an air purifier which has an indicator which warns you when it is time for the filter to be replaced. This will help you in timely replacement of your filter and will maintain the efficiency of the device. Air purifiers also have adjustable fan speed which depends on the quality of air in the room. It is a good idea to test the air purifier at the store for its sound level by running it at maximum setting. You should be comfortable with the volume of the humming sound it generates as once you install the air purifier in your room, you will have to live and sleep with that sound in the background.