I choose Option #2
I gather my mail and notice that my energy bill exceeds the norm. According to Rafati et al. (2022), heat, ventilation, and air conditioning (HVAC) systems are some of the most energy-intensive equipment. Their faulty or inefficient operation can significantly increase energy bills.
Rafati, A., Shaker, H. R., & Ghahghahzadeh, S. (2022). Fault Detection and Efficiency Assessment for HVAC Systems Using Non-Intrusive Load Monitoring: A Review. Energies, 15(1), 341. https://doi.org/10.3390/en15010341Links to an external site.
Bauer, R. (2018). Introduction to Chemistry (5th ed.). McGraw-Hill Higher Education (US). https://ambassadored.vitalsource.com/books/9781260162165Links to an external site.
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