The purpose of this HVACR training project is to visually show your students the change in the amount of liquid flowing through a TXV or...

When servicing an air conditioner or heat pump, we often notice a low airflow problem which needs to be fixed. If there is no indoor air...

If you suspect that an evaporator coil is clogged with dust but cannot visually see it, such as when you can't directly inspect on a...

Measuring airflow is one of the most commonly missed or ignored topics in HVAC when commissioning or diagnosing problems in systems. I...

Today most people are aware of the invisible, odorless, poisonous gas of Carbon Monoxide or CO for short. Now we know that even low...

Problem #1: No Power to the Package Unit On all HVAC systems, power is critical to operation, and a package unit is no different. There...

I just finished reading the book Unconformed, by Bryan Orr, from HVAC School. I invested about 5 hours spread over three days and let me...

(This image is courtesy of our friend JD Kelly @student_of_hvac) In this refrigerant flow diagram, we see a simplistic piping arrangement...

(This image is courtesy of our friend JD Kelly @student_of_hvac) This drawing shows how a low voltage wiring circuit can control a high...

This short project is designed to show how to teach thermostat operation and wiring to a newer HVAC technician or a student in a mobile...

Explaining how an EEV operates is much easier when you can show exactly what is happening, each step of the way. This project is meant to...

This training project is designed to provide a clear way to see how a pressure transducer operates and how they can be tested. Why does...

This training project is designed to show how bead thermistors and tube thermistors work, along with the difference in sensitivity...

Explaining how a louver motor operates is much easier when you can watch the louver blade move, each step of the way. This project is...

This article covers the ten most common locations where refrigerant leaks may be on an air conditioning system. An electronic leak...

It is certainly important to have good training and/or experience in the field prior to applying for an HVAC/R position. However, some do...

This article covers the 10 most common reasons the blower fan does not turn on! A blower motor may be installed in a forced air gas or...

In this article, we discuss the accumulator tank, its function, why its used, and its location in the system. The photo below shows the...