Room air conditioners or window-mounted ACs are the most standard ACs you’d find in homes, but you typical won’t have one installed by a heating and air conditioning company. They fit in most windows, and they’re very efficient. The measurements that involve ACs are called Energy Efficiency Ratio or EER and Seasonal Energy Efficiency Ratio or SEER, and they both have something to do with how efficient and energy-saving the AC is. The higher the EER or SEER, the less energy it consumes. Window-mounted ACs have an average of 10 to 11 EER, which is less compared to split-type AC or central AC, but it doesn’t make window-mounted air conditioning less efficient. In fact, if you’re after energy efficiency, a window-mounted AC would be the best choice for you despite its lower EER.
Although efficient, a central AC is designed to cool a whole floor – even empty rooms, which will take a longer time to cool the entire floor completely since it has to go through empty rooms. Window-mounted AC, on the other hand, adopts a short period of cooling a room since it’s only turned on when there are people in the area.
On the contrary, the window-mounted AC simply gets air from the other side of the window, the process of conversion and cooling the air happens in the same system in a matter of seconds. Meanwhile, central AC gets the air from outdoors, as well, but makes the air go through the ducts in the house’s attic and the conversion takes place in another part of the system. The trouble with central ACs is that the ducts are very vulnerable to holes and tear, and at the same time, they’re located in an almost inaccessible area of the house. When ducts get holes, they decrease the AC’s efficiency by 20%, also reducing the cooling output.
The downside of window-mounted ACs is that they’re not so quiet. Nonetheless, this same noise reminds homeowners to turn them off before they leave the room. On the other hand, central ACs are stealthily quiet and cold at the same time which makes them forgotten and working even in empty rooms all day.
In conclusion, although very efficient, central AC encourages unnecessary and excessive usage, unlike window-mounted AC that has a noise that can serve as a reminder for homeowners to turn them off.
Another helpful fact is that when sleeping, we only need 6,000 BTU/hr to keep us cozy, and using a central AC is too much and is more than what we need. If this is too much, it could be too cold and uncomfortable.
The secret to saving power while enjoying the cold air is to get a window-mounted AC that has a lot of features, which can help conserve energy or save money because of its functions, instead of getting another appliance. If you are not satisfied with the cold air that the AC produces, it’s best to insulate the walls in your house, so the coldness stays in the room much longer even after turning the AC off.