By Kenneth Gray While the world as people know it today is sustained by a handful of technologies, it's fair to say that some have been more impactful than others. This particularly becomes apparent when heating and air conditioning PA come into the picture. Without this combination, it wouldn't have been possible for people to live so closely within cities, or in certain parts of the world. So it's no surprise that nothing can substitute the role your HVAC unit plays in your home, or the need for you to keep tabs with its performance. Although comfort is what often springs to mind in this context, this shouldn't make you discount its role in distributing air throughout your space. Think that air pollution is strictly an outdoor issue? Think again. This notion has been debunked by a handful of studies, with some showing that indoor air can be much more polluted than that found outside. To make matters worse, the elements responsible for this aren't as visible...