The HVAC system, otherwise known as Heating, Ventilation and Air Conditioning, is akin to the lungs of a building, circulating and conditioning air for optimal inhabitant comfort. When functioning optimally, HVAC systems can significantly enhance the quality of life within a building. However, without regular maintenance and cleaning, these systems can degrade and lead to a host of complications, including health issues and energy inefficiency. Consequently, securing a proficient HVAC cleaning service is imperative for any building owner or manager.

Undertaking the task of hiring a professional HVAC cleaning service requires consideration of several factors. These factors are not unlike the axioms of financial economics, where the goal is to achieve an optimal balance of risk and return. In this context, risk translates to the potential for inadequate service, while return is a well-functioning, clean HVAC system. Therefore, it’s essential to approach this task armed with the necessary information and set of considerations that will optimize the selection process.

Firstly, it's crucial to verify the credentials of your prospective HVAC cleaning service. Evidence of certification from recognized industry bodies such as NADCA (National Air Duct Cleaners Association) is a key indicator of professionalism and competence. These certifications are not decorative badges but bear witness to the service provider's commitment to adhere to established industry standards and practices. They serve as a testament to Robert K. Merton's "Matthew Effect," where past success (in this case, the effort to get certified) is indicative of future performance (quality of service).

Secondly, the experience of the service provider should be a major determinant in the selection process. In this context, the law of large numbers, a theorem in probability and statistics, holds sway. Essentially, a service provider with extensive experience, having serviced numerous HVAC systems, is more likely to deliver satisfactory results due to their familiarity with a wide array of system types and potential complications.

Next, it is advisable to engage a service provider who conducts a thorough inspection before embarking on the cleaning process. Akin to the scientific method, where observations precede hypothesis testing, a good HVAC cleaning service gathers data (via inspection) to inform the cleaning process. An inspection should cover all the components of the HVAC system, including air ducts, coils, and blower. This thoroughness ensures that nothing is overlooked, and the cleaning is comprehensive.

Additionally, the technology and techniques utilized by the service provider are of paramount importance. There exists a tradeoff between the effectiveness and invasiveness of different cleaning techniques. For instance, while "brush and vacuum" techniques are highly effective at removing debris, they may potentially damage the internal structures of the HVAC system. Conversely, "source removal" methods, which involve blasting air through the system, are less likely to cause damage but might not be as effective at removing stubborn debris. Therefore, the service provider must demonstrate a judicious selection and application of techniques, optimizing for both thorough cleaning and system integrity.

Finally, it's essential to obtain and compare quotes from multiple service providers. This process is analogous to the economic principle of competitive markets, where prices are driven by supply and demand dynamics. By acquiring multiple quotes, you ensure you obtain a fair and competitive price for the service.

In conclusion, hiring a professional HVAC cleaning service is a critical task that requires an informed approach. By considering factors such as certification, experience, thorough inspection, cleaning techniques, and comparative pricing, one can optimize the selection process, ensuring a clean and efficient HVAC system. This is akin to a well-functioning lung, providing a healthy and comfortable living environment for building inhabitants.