Any air filter rated higher than 13 will restrict airflow to the point of causing damage to your HVAC system, resulting in an additional expense to repair it. Another unwanted effect of this reduced airflow is on the cooling side. The air conditioner has a hot coil on the outside, the condenser and a cold coil on the indoor air handler. This cold coil has a specific preferred operating temperature.
That temperature is based on a certain amount of hot air flowing through that coil and the coolant circulating through that coil's copper tube. With a higher merv filter that reduces airflow through this crucial part of the air conditioning system, the cold coil can eventually freeze and become an ice ball, restricting airflow completely. Without giving further details, this causes more costly problems in the outdoor condenser coil. While the highest merv ratings are the most effective for air quality, they can damage your HVAC system.
Not all filters have a MERV. Not all filters have a merv rating %26, many of them are purchased in large stores. The merv scale is a standard measure of a filter's ability to remove particulates from the air in your home. In this case, you want to have the air as clean as possible without restricting airflow to the HVAC unit and wasting energy.
Merv 13 filters, for example, also remove bacteria, tobacco smoke, car fumes, insecticide dust, pet dander and more. Mcmaster Carr manufactures the MervMcMaster Carr manufactures the Merv-15 airbags that some universities are testing for face masks. While ASHRAE recommends MERV 13 and 14, it's best to select a filter with the highest possible MERV rating for your specific HVAC system. With all due respect Allison, with all due respect Allison, I question the need for the MERV 13 leak.
I'm wearing a MerVi cape. I am using a layer of Merv 1900 3M Filtrete on my mask (I made the mask as a cover so I could remove the filter to wash it). Also, if I tried this modification of the MERV13 filter myself, I would make many filter discs and change them after each exposure to several people. MERV filters 9 to 12 are the best filters that a residential HVAC system can accommodate without major system modifications.
Most modern HVAC systems have no problem working with higher MERV filters, so millions of homeowners rely on them.