Hundreds of years of scientific breakthrough have been based on observations and data. The data has come from diverse sources and, when interpreted, allows scientists to discover breakthroughs like gravity, the laws of motion, and the fact that the Earth is round. More recently, it has allowed sensor technology to bloom and artificial intelligence to advance. Both commercial and residential mechanical rooms are filled with new sensors that provide a deluge of data points for contractors to use. As the data pours in, contractors are learning to interpret and leverage this information to create optimal systems for the building management staff as well as the homeowner. A direct result of this data — predictive maintenance — is now a possibility as HVACR contractors endeavor to help their customers remain comfortable and efficient in their office buildings and homes.