The first thing to do to get this process going is to identify which motor you need. To do this, the best way to start is by going to the condensing unit or heat pump that the motor is coming out of and getting the model and serial numbers. There should be a label affixed to the outside of the unit, usually towards the back of the unit which will most likely be the side closest to the house or building. Sometimes, the unit has been installed so close, you will have to use a mirror and try to decipher the model number backwards in the reflection, but nonetheless, it can be done. In the event that the label is illegible or has been bleached away from years of sun exposure or other elements, there is still a way to make the identification on what you will need.