What is the common design cycle condenser split for units rated at 13 SEER?

The common design cycle condenser split for units rated at 13 SEER is typically around 20°. This temperature split refers to the difference between the outdoor temperature and the refrigerant temperature returning to the condenser. A 20° split is used as a standard in sizing and performance calculations for systems rated at 13 SEER, as it balances efficiency and performance under different operating conditions.

In practice, this means that if the outdoor air is at a certain temperature, the refrigerant in the condenser will ideally be about 20° cooler than that air. This standard split ensures optimal heat exchange and effective cooling.

The other options, while they represent potential splits, are not commonly associated with the efficiency standards of a unit rated at 13 SEER. Using a split that is higher or lower could result in inaccurate performance estimation or inefficiencies in the system's operation. Therefore, adhering to the established common design cycle split is key to maintaining proper system efficiency.