The software allows HVAC engineers to achieve the lowest life cycle cost for an air handling unit ("AHU") while achieving the highest indoor air quality (IAQ) through the use of the manufacturer’s air filters. Instead of using theoretical averages, the software calculates the pressure loss of filters, and their actual lifespan using real-life data collected from thousands of installations and tests. This information guides users to the choice of the best-performing filter with the lowest possible energy consumption and environmental impact. Rising energy prices have made building ventilation more expensive. By optimizing air filter choices for AHUs, customers realize immediate and substantial savings without compromising IAQ. Air filters are the least inexpensive and simplest component of an HVAC system to change. The software offers several important benefits. It facilitates the preparation of reports and recommendations for environmentally-friendly air filter solutions, allows easy transfer of data and information between users and their PCs, and displays a broad range of valuable reference information. The software also recommends energy-saving fan speeds and generates multi-solution calculations and graphical reports.