My littlest one has been having some breathing problems. One thing the doctor suggested was making sure we keep our air filters super clean. I’m now convinced that Groupon has absolutely EVERYTHING I’ll ever need!! You can snag 3M Filtrete Electrostatic Furnace Filters plus FREE shipping and FREE returns for 62% off! You are supposed to change filters every 90 days, so the 12 pack will last you almost THREE YEARS. The 12 pack will last you about a year and a half! These 3M electrostatic filters are good because they take in the bad things from the air and TRAP them in the pleats. Here are just a FEW things that these filters trap: airborne allergens, pollen, mold spores, dust mite debris, smoke, pet dander, household dust, and smog, bacteria, lint and particles that can carry viruses. This is definitely something to invest in!! You’ll pay $59.99 SHIPPED for the Electrostatic Furnace Filters so that’s like paying less than $20 each year for the 12 pack. I spend more than that at ONE doctor visit!