The first tip is to check the MERV ratings. To be on the safe side you should consider air filter with higher ratings especially from 5-14 can be better. This is important since filters with higher rating has the ability to remove dust, mold, pathogens effectively. The MERV always rate air filters according to their ability to remove dust and other contaminants. Being that the ratings always start from 1 to 20 you will not expect the filter that is rated 1 to work better than the one that is rated 20 which cannot be in real sense. You should also know that there are some tough stains that can only be removed by air filters with higher ratings.
Another thing that you should consider is the cost. Normally the prices are set according to the efficiency of the air filter. You find that the ones that are highly rated tend to be very expensive than the once with lower ranks. One thing that should guide you in this is to weigh the price against efficiency. It is recommended that instead of purchasing cheap low-quality filters, you should find the ones that are affordable but they can remove the dust efficiently. This is something that you can only achieve by taking your time to shop around for some of the best deals.
Apart from that, it is also important that you consider the size of air filters. For you to choose the right size you should know the size of the existing air filter. Normally the sizes are written on the filter and if not, you should just measure them. Apart from that, you should also confirm if the filter can fit well in the ventilation.
It is also important that you check the size of particles the filter can capture. In this you will be required to go for the one that can capture many dust particles. This will set you free from dusting the house all the time even though it will not eliminate all the dust from the house.
You should also use the references to find the best air filters. With this you will get references from some of your friends that have used the air filters before. As a result, you will be in a position to select some of the best filters considering that they have been seen working before.
You can as well use some online research. This should be done through sites of dealers of air filter. You can use the ratings and the product reviews to come up with some of the best filters.