How often should I have my furnace inspected to ensure it operates at peak efficiency and adheres to safety standards? Is there a universally accepted frequency, or does it vary based on specific factors such as the age of the unit, the type of fuel used, or even regional climate conditions? What are the potential risks associated with neglecting regular inspections, and could that lead to costly repairs or hazardous malfunctions? Given the importance of maintaining an optimal indoor climate, how do seasonal changes influence inspection schedules? Should I consider an annual inspection as a baseline, or would biannual checks be a more prudent decision? And what role do professional certifications play in selecting a technician for these inspections? Ultimately, how can I ascertain that my furnace is operating safely, efficiently, and in compliance with the latest industry standards? What other maintenance practices should accompany these inspections to maximize performance?