Well mainly it s a way to save space.
Attic based ac system.
It is called a split system.
Unless you have a finished attic you probably aren t fond of spending time up there during a hot summer day.
If your attic tends to get hot it can make your air conditioner less efficient.
But with proper ventilation you can at least bring those temperatures down to match that of the outdoor air.
An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan.
With no air conditioning vents pumping in cool air and the hot sun beating down on the roof right over your head attic temperatures can soar.
They consume to much energy.
A split system is exactly what it sounds like.
In addition to making the unit hard to get to for service high attic heat can trigger the high pressure limit switch turning your condenser off.
In terms of energy use room air conditioners are not known for efficiency as well.
Some people argue that the heat in your attic will warm the air your system has cooled before it even has a chance to move through the ducts in your attic and into the rest of your home.
Typically this indoor unit gets placed in a cabinet or closet somewhere inside.
Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.
To reset the switch you ll need to climb up into.
Aesthetically and practically speaking a bulky ac system in a small space like an attic is not only ugly and obtrusive but will also take up a space and even a sizable amount of elbow room.