An HVAC engineer designs, selects, and troubleshoots the heating, ventilation, air conditioning, and refrigeration systems that keep buildings safe, comfortable, and efficient. Most people reach this job through a mechanical engineering bachelor's degree or a related associate's degree, and most of the work is calculation, drawings, and coordination with architects, electricians, plumbers, and contractors. The core idea is simple: heat moves, and you size equipment to move it where you want it. You start with thermodynamics and psychrometrics, learn to calculate heating and cooling loads, then
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Stage 1 of 4 · about 16 weeks
Learn the physics and math behind HVAC: heat transfer, thermodynamics, fluid flow, and psychrometrics. Be able to explain why a building gets hot, how an air conditioner removes heat, and read a psychrometric chart. Practice by calculating the heat gain of one room by hand and in Excel.
Engineering math and units
Every HVAC formula carries units, and most beginner errors come from mixing Btu/h, tons, kW, cfm, and L/s. If you can handle units calmly, everything after this gets easier.
Heat transfer and why buildings get hot
A load calculation is just heat transfer applied to a room. If you understand the three modes, you can explain any heat gain and know what to change to reduce it.
Thermodynamics and the refrigeration cycle
You cannot design or troubleshoot cooling equipment until you understand how it moves heat uphill from cold to hot. This is the core of every air conditioner, chiller, and heat pump.
Psychrometrics
Air is a mix of dry air and water vapor, and comfort depends on both. The psychrometric chart is the map HVAC engineers use daily to size coils and control humidity.
Fluid flow basics for air and water
Fans and pumps move heat around a building. Knowing how flow, velocity, and pressure relate helps you understand ducts and pipes before you size them in the next stage.
Then 3 more stages (about 112 weeks in all) with lessons, drills, projects, 10 interview questions with strong answers and free resources.