| Air conditioning was one of the most important | | | | have no electrical heating, others have as much as 5 |
| technological developments of the twentieth century. | | | | kilowatts. They use either 208 or 265 volt electricity. |
| Trane is a key manufacturer of heating and cooling | | | | The units can be turned on and off remotely. This |
| systems. Following is an overview of Trane through | | | | could be useful in a hotel, where a central location |
| the wall air conditioners. | | | | could ensure that only the rooms in use are being |
| The two main techniques for cooling air are | | | | heated or cooled. This could save both staff time |
| evaporation and refrigeration. This article does not | | | | and utility bills. |
| address the evaporation method. Refrigeration | | | | They can work with different kinds of thermostats. |
| systems actually use evaporation, but the fluid that | | | | Maintenance staff can establish upper and lower limits |
| evaporates is in a sealed system. After it has | | | | on thermostat settings. If necessary, a separate |
| provided cooling, it is recompressed and reused. | | | | temperature sensor can be placed in a better location |
| Trane used to be part of American Standard | | | | in the room. |
| Companies and is currently part of Ingersoll Rand. It | | | | They can be set to dehumidify the air without |
| makes many heating and air conditioning systems. In | | | | cooling it. In many circumstances this can give the |
| addition to air conditioners, Trane also makes gas | | | | same comfort level as cooling for less expense. |
| furnaces, heat pumps, and integrated systems. They | | | | Outside air can be vented in to the room through a |
| have both commercial and home product lines. | | | | filter. This reduces the load of pollen and dust, making |
| Most of the Trane product line consists of large scale | | | | the air more pleasant to breath and helping to keep |
| cooling systems such as central air conditioning | | | | the room from getting dirty. They can be very quiet |
| systems. They also make a line of through the wall | | | | when the fan is on low. |
| air conditioners, but they don't call them that. The are | | | | Heat pump units with electrical heating will turn on the |
| Packaged Terminal Air Conditioners (PTAC). They are | | | | electrical heat if a heat pump failure is detected. If all |
| designed to have part inside and part outside, | | | | units come back on right after a power failure, a |
| connected through a hole in a wall. They could be | | | | dangerous surge can occur. This is prevented by |
| used to cool, and possibly also heat, guest rooms in a | | | | delaying each unit's restart for a variable period. The |
| motel or hotel. This simplifies separate temperature | | | | compressor will not restart for at least three minutes |
| control for each room. It also makes it easy to turn | | | | after a shutdown. A faster restart could cause |
| off the unit when no one is using a room. | | | | excess wear. |
| PTACs can be either heat pumps or conventional air | | | | Due to their efficient and quiet operation, centralized |
| conditioners. Heat pumps are air conditioners that can | | | | air conditioning and heating are often favored. It is |
| also heat. They do this by reversing the air | | | | good to remember that less central options have |
| conditioning process and pumping heat inside from | | | | their advantages. In some situations one of the |
| outdoors. | | | | Trane through the wall air conditioners can be a good |
| Trane PTACs can cool at anywhere from 7,000 | | | | choice. |
| BTUs to 15,000 BTUs, depending on the model. Some | | | | |