1 This generally includes replacing a few parts like hoses, sensors, or either the compressor or condenser. 2  CostHelper readers report paying $171-$727 for minor air conditioning repairs, at an average cost of $488. 3  Extensive auto air conditioning repairs can cost $1,000-$4,000 or more, depending on make and model.
Their numerical system is similar to that of the Romans, but instead of Xâs and Iâs they use dots, bars and shells. Each dot has the value of one, each bar the value of five, and each shell the value of zero. This brings us to the main mathematical contribution of the Mayans, the concept of zero.
The Mayan Calendar. The most enigmatic of all of the Mayan contributions to astronomy is their calendar, a complex system of interlocking cycles that keep time even more accurately than our own. This complex calendar system fueled much of the New Age romanticism surrounding the Mayans.