Final answer:
Systems with a capacity of 7.5 tons or more and that employ a thermostatic expansion valve will include a distributed refrigerant circuit for efficient operation and varying efficiency ratings based on the installed coil.
Step-by-step explanation:
Systems rated at 7.5 tons and higher that use a thermostatic expansion valve at each coil will also have a distributed refrigerant circuit. This ensures that the correct amount of refrigerant is supplied to each coil, allowing for efficient operation of the system. The efficiency ratings of such systems can vary depending on the coil installed, and it is advisable to consult with your contractor for specific details relevant to your geographical area. Additionally, these systems typically include a condenser, evaporator, and compressor, with the condenser and evaporator coils facilitating heat transfer in accordance with the second law of thermodynamics.