Since the first air conditioner was invented in 1902, air conditioning has come a long way. AC units are one of the most important appliances in homes and businesses. In fact, 85% of American homes have an AC unit. Today's AC units use up to 30% less energy than they did just a decade ago. But even with all of the technological advancements, AC units can still break down.

Air conditioning systems are not cheap and the high costs add up if there is a need for repair. By taking a proactive approach to air conditioning maintenance there is a greater chance of avoiding larger issues like a complete system replacement. Here are four key areas to focus on when it comes to air conditioning repair.