On a hot summer day, people may take for granted how their air conditioner can keep their home or business so cool and comfortable. A room air conditioner works by drawing in warm room air through a filter and moving it past cooling coils filled with refrigerant. The refrigerant exchanges between a liquid and gas state within the air conditioner as the warm air circulates through the coils. This process consumes the heat in the air, allowing only cold air to blow back into the room. We have the quality replacement parts you need to keep your A/C unit delivering refreshing cold air -- even on the balmiest of summer days.