Course Description

Every HVAC system, no matter how complex, exists for one reason: to maintain a heat and moisture balance between an indoor space and the outdoor environment. Think of a building as a bucket with holes. Heat pours in through windows, walls, people, lights, and equipment. The air conditioner removes that heat. If removal equals gain, the space stays comfortable. If removal is less than gain, the temperature rises. In winter, the system adds heat to compensate for losses through conduction and infiltration. The very first rule of thumb is that roughly sixty percent of a typical commercial cooling load comes from solar gain through glass, not from people or lights. Many young engineers chase the wrong load because they focus on internal loads first. For every one degree Fahrenheit you increase the indoor temperature during cooling, you save about three percent of your cooling energy. That is huge-it costs nothing to implement, and it pays back immediately. Heavy construction materials like concrete and brick shift the peak load by two to four hours. That means the hottest part of the day outside does not line up with the hottest part of the day inside. This matters for thermal storage and for demand response strategies. Never size equipment to the instantaneous peak without considering diversity. Oversizing kills efficiency through short cycling, because the equipment starts, runs for five minutes, stops, and never reaches steady-state efficiency. The most efficient system is one that runs continuously at seventy to eighty percent of its maximum capacity. Finally, comfort is not just temperature. It is a combination of dry-bulb temperature, humidity, air motion, and mean radiant temperature. You can have perfect air temperature and still be uncomfortable if the walls are radiating heat or if the air is dead still. Always remember that.

What you'll learn in this course?

• Apply key psychrometric principles and the perfect gas laws to real-world HVAC troubleshooting without complex maths.

• Calculate sensible and latent heat loads using industry-standard rules of thumb for quick feasibility checks.

• Differentiate between laminar and turbulent flow to optimize duct and pipe sizing for energy efficiency.

• Select appropriate air side and water side equipment based on capacity, pressure drop, and noise constraints.

• Interpret fan and pump affinity laws to predict energy savings from speed reduction.

• Diagnose common system inefficiencies including low delta T syndrome, short cycling, and air lock using systematic logic.

• Apply the 10 essential HVAC rules of thumb for floor area, CFM per ton, water flow rates, and pipe velocities.

• Design a basic duct system using the equal friction method and static regain concepts without specialized software.

• Specify expansion tank sizing, air separation, and water treatment basics for hydronic systems.

• Evaluate refrigerant cycle performance using superheat and subcooling measurements on a pressure-enthalpy chart.

Prerequisites

• Basic knowledge of mechanical systems, heat transfer, temperature, pressure, and engineering units

• Familiarity with building systems and technical drawings is helpful Wiscademy | HVAC Hacks - Module 1 2