NATE Air Conditioning and Heat Pumps Practice Exam

When integrating a heat pump with an existing fossil-fuel furnace, ensuring efficient operation and maintenance is paramount. The requirement to ensure the number of fins per inch matches the replaced coils is not necessary in this scenario. The focus should be on the overall compatibility and performance of the heat pump system rather than matching the specifics of the old coils.

Fins per inch are a specification that pertains to the design of the coils and can impact heat transfer efficiency, but they do not affect the installation or functionality of the heat pump in conjunction with a furnace. Instead, the emphasis is placed on maintaining proper airflow, drainage, and preventing simultaneous operation, which are critical for the systems to operate efficiently and safely. Proper clearance around the outdoor section and leveling the indoor coil's condensate pan are integral steps to ensure that the system functions correctly and prevents operational issues.