In last month’s column [“Automatic Pumpdown Systems,” Nov. 5], we talked in general about the automatic pumpdown cycle and why it is the only sure remedy for refrigerant migration to a compressor ...

The way we control the speed of fan motors or pump motors has tremendously changed in the past two decades with the introduction of variable-frequency drives (VFDs), aka variable-frequency controllers ...

For the residents who live in rural-areas, limited water-availability is a very common problem. Therefore, many people install a water tank on the roof of the building. The water, stored in a water ...