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Definitely electrical...

Motors and compressors and burners are all controlled by low voltage circuits (even if the relay or valve controls high voltage)... so learning how to deal with the low voltage control circuits... is where most of the issues are.

While one can learn electrical theory all day long... one must have hands on experience to be proficient in trouble-shooting a furnace or HP.

Having said that... airflow characteristics are important also... be sure to learn that too!
 
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