Overview

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This course introduces essential HVAC formulas that technicians use to design, troubleshoot, and optimize heating and cooling systems. Learners will build practical skills by working through real-world calculations, including how to clock a gas meter for accurate fuel consumption, determine airflow in cubic feet per minute (CFM), and interpret psychrometric charts to analyze total heat conditions. The course also covers how to calculate sensible and latent heat, along with understanding moisture removal in air systems. By completing this course, learners will gain confidence in applying critical formulas on the job, leading to more precise diagnostics, improved system performance, and better customer outcomes.

Syllabus

Clocking a Gas Meter

This lesson provides HVAC technicians with a step-by-step guide to the "timing method" for measuring gas consumption. Technicians will learn how to isolate a single appliance, time the rotation of the gas meter service dial, and apply specific formulas based on dial size. The lesson concludes by demonstrating how to translate these readings into BTUs, a critical skill for equipment sizing and performance verification in the field.

Calculating CFM

This module provides a comprehensive guide for HVAC technicians to accurately measure and calculate air volume (CFM) using the temperature rise method. Learners will explore why gas furnaces require efficiency adjustments due to flue losses, while electric furnaces utilize a direct one-to-one energy conversion based on Ohm's Law. Through detailed step-by-step examples, the lessons demonstrate how to integrate temperature differences, gas meter timing, and electrical measurements to ensure optimal system performance and safety.

Total Heat

This module explores the critical role of enthalpy and psychrometrics in determining the total heat load of an air conditioning system. Technicians will learn how to use a psychrometric chart to identify energy content in BTUs and calculate the "Delta H" between return and supply air. The content also details the mathematical relationship between air volume (CFM) and the weight of air, providing a standardized method for optimizing system design and cooling efficiency.

Sensible Heat

This module provides a comprehensive guide on calculating sensible heat within HVAC systems, specifically focusing on air passing across a furnace heat exchanger. Learners will explore the step-by-step application of the sensible heat formula using CFM, the standard air constant (1.08), and the calculation of Delta T. By the end of the module, technicians will understand how these calculations serve as a foundational skill for improving energy efficiency and system reliability.

Latent Heat

This module focuses on the critical role of latent heat and dehumidification within HVAC systems. Learners will master two primary calculation methods—one utilizing the relationship between total and sensible heat, and the other involving Cubic Feet per Minute (CFM) and psychrometric data. Additionally, the module covers the conversion of liquid water extraction into energy values (BTUs) to assist in the precise sizing of dehumidifiers and air conditioning units for both residential and commercial applications.

Final Knowledge Check

This final knowledge check is designed to reinforce key concepts from the lesson and assess your understanding. You’ll apply what you’ve learned through a series of multiple choice questions, helping ensure you’re confident and ready to move forward.