An air conditioner is set to cooling mode by default, and it runs according to the set temperature, with fan speed of either low, medium or high. Electricity savings in this case will depend upon the thermostat temperature. An air conditioner running at 18 degrees set temperature will consume more energy than the one running at 25 degrees.
Quick Cooling mode
As the name suggests, this mode is definitely not a treat for your pockets. If the outside temperature is high, this mode will turn on the AC at the lowest available temperature (depends on the type of AC) and will take longer time to cool the space. This way, the compressor will blow harder to bring the temperature down to the minimum point. As a result, more energy will be consumed and higher bills you'll have to face.
In this mode, the compressor stops operating and the fan blows continuously at the set speed. Since, compressor is the most power consuming part of an AC; you can save a lot on the overall consumption. However, you may not be able to get the desired cooling. The fan will only circulate the cooled air throughout the room, to provide comfort for a short time.
Sometimes, in many locations, mostly the ones near the sea, the weather seems to be cool, but there is enough humidity to become a cause of discomfort. In such a condition, taking out the humidity from the room is all you require. Dry mode allows for humidity removal, by making the compressor work for a short time in larger cycles, to eliminate the moisture. The fan blows at a slower speed and air is dried to a point of comfort.
Power Saving mode
In the normal cooling mode, compressor cut-off happens when the room temperature becomes the same as the thermostat, and it again restarts with an increment in temperature. In the power saving mode, both the fan and the compressor is turned off, when the desired temperature is reached. This increases the cycle time in which the compressor is turned on and off, as the fan will only blow once the temperature has risen. The fan takes more time in sensing the increase in temperature, thus allowing the compressor to run less. Shorter compressor cycles can be a nightmare for your bills, in addition to calling for a need of air conditioning repair Roswell
This mode allows the air conditioner to add an extra degree to the thermostat after an hour of operation, up to a maximum increase of 3 degrees. On a bigger picture, electricity savings are great for every increase in temperature. You can save up to 20% on annual utility bills if you continue operating the AC at an optimum temperature, just enough to get the atmosphere cozy.