I recently shared a detailed breakdown of how I built the frontend interface of my tools using JavaScript (you can check it out on my Dev.to profile). Today, I want to focus on the backend—the part that does the real heavy lifting.
As a TAB (Testing, Adjusting, and Balancing) Technician, the calculations I handle go far beyond simple math. They involve fluid dynamics, fan laws, and air density corrections that vary with altitude and temperature. While JavaScript powers the user interface, I chose Python to manage the core engineering logic behind the scenes.
Working in the Bay Area presents unique challenges. Microclimates mean one project may be at sea level while another is in the hills. Many standard calculators ignore air density ratios, which can skew balance reports by 5–10%.
To solve this, I built a lightweight Python library for TestAndBalance.xyz that standardizes these corrections and automates fan law calculations. Unlike most proprietary and expensive HVAC software, I believe the core math behind our trade should be open and accessible.
You can explore the tools live at TestAndBalance.xyz or view my full portfolio at dyamiconnell.com.
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