The filter is the least expensive item in your heating, ventilation and air conditioning system, but its size and style can help or hurt energy efficiency.

Popular Science has a breakdown on its choices for the best filters, with considerations for smog, pet dander, odors, allergies, budget and much more.

Check it out:

https://www.popsci.com/gear/best-hvac-filters/

Footnote: Your air filter should not be whistling while it works. The whistling means it’s not the right size.

Premier HVAC, a locally owned company, guarantees its work and is available 24/7 for emergencies.