An annoying red light has been flashing on my air conditioner for the last two weeks—a sign that, most likely, I need to change the filter. I'm more motivated to do so after reading Jamie Ducharme's comprehensive guide to AC, which explains how it works, how to use it best, how it affects air quality and human health, and, yes, why changing the filter is so important.
Patients have saved thousands of dollars a year on medications to treat chronic and life-threatening conditions. Here are 6 strategies that have helped.
