- Identifying issues such as unusual noises, decreased airflow, odd odors, or rising energy bills that suggest problems with the system. 4. **What are the most common mistakes made during air conditioning installation and how can they be avoided?

- Identifying issues such as unusual noises, decreased airflow, odd odors, or rising energy bills that suggest problems with the system. 4. **What are the most common mistakes made during air conditioning installation and how can they be avoided?
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