If your air conditioner requires refrigerant every year, it most likely has a leaking refrigerant circuit and will need to repair or replace the system. The refrigerant circuit consists of the air conditioner, the set of copper refrigeration pipes and the evaporator coil. When you buy through the retail links on our site, we may earn affiliate commissions. Keep in mind that if your central air system works constantly or if you have pets, you'll need to change your filters more often. For a living room or family room, you'll need a large air conditioner, from 9,800 to 12,500 BTUs, especially if you have an open floor plan.