Dear Readers: These days, we’re all looking for ways to save money, and an easy way to do that is by changing your home’s air filter. Not only will the air you breathe be cleaner and healthier, but doing this on a regular basis can lower your utility bills.

When was the last time you checked or changed the filter? Having a clean filter should be a priority. If you have a permanent filter, it should be washed once a month. Be sure to follow the manufacturer’s directions—some say you can use a mild soap; others say not to. Replaceable filters should be changed when they start to look...

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