Air conditioning can feel like magic on a hot day. An HVAC instructor at Northern Virginia Community College explains how it works.

This ain't no installation tech feature (though we may get to that in the near future), but it's more an overview of air conditioning systems, how they work, why they sometimes don't work, and how to ...

Your AC's outdoor unit works by pushing the heat from inside your home into the outside air. On a 44-degree afternoon, that outside air is already so hot that the unit has to work significantly harder ...