Furnace efficiency is one thing.
Best high efficiency air filter.
High efficiency air filters are a cost effective way to help improve indoor air quality which may be beneficial to family members sensitive to allergens and other particles in the air.
These filters trap 80 to 95 percent of the particles 5 microns and larger more than enough filtration for most households.
Hepa stands for high efficiency particulate air hepa filters are physical filters designed to clear out at least 99 7 percent of particulates that are 0 3 microns or larger in size.
Finding the best hvac air filters for home for most homeowners a more expensive merv 7 or 8 pleated filter provides a good balance between cost and filtration efficiency.
The best air purifiers for such a task he says are high efficiency particulate air hepa filters which can pluck out particles that are as small as five micrometers or one millionth of a meter.