HVAC ACCESSORIES > GENERAL TOPICS
Welcome to MicroMetl’s General HVAC Knowledge Center
The HVAC field is full of complex systems, evolving technologies, and everyday challenges that require clear guidance. Our General Topics section breaks down foundational HVAC concepts into practical, easy-to-understand explanations for technicians, installers, service teams, and anyone looking to strengthen their technical knowledge.
From understanding the basics of air conditioning and heat pumps, to exploring static pressure, V-belts, IAQ, equipment supports, and essential measurement standards—each article is written to help you build confidence in the field and make informed decisions on the job.
Whether you’re training new team members, refreshing your own skills, or exploring how HVAC systems all work together, this is your starting point.
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What Are QR Codes and Three Reasons Why You Should Use Them!
What Are QR Codes and Three Reasons Why You Should Use Them! What’s up with those crazy squares? To get Freudian, I think the blob resembles Big Foot, and could possibly reveal the burial place of Jimmy Hoffa. When psychologist Hermann Rorschach created the Inkblot...
How Does an Air Conditioner & Heat Pump Work? – Basic HVAC Tutorial
The Simplistic Definition of an Air Conditioner… An A/C system removes heat from inside your home, and transfers it outside. This article is intended to explain the most basic functionality and operation of an Air Conditioner System and Heat Pump.
Air Duct Calculator (Ductulator), What Is It & How Does It Work – Video!
Air Duct Calculator (Ductulator) What Is It & How Does It Work VIDEO!!! So what is an Air Duct Calculator (Ductulator)? MicroMetl has produced a high quality video demystifying it's purpose and functionality. This handy little device allows you to size your new...
What Is an HVAC Equipment Support and How Does It Work?
Referred to as Equipment Supports, Equipment Rails, Support Rails & Sleeper Curbs. These load-bearing supports are typically used to elevate and/or load support rooftop piping, ductwork, HVAC equipment, RTU’s (Rooftop Units), walkways, and more. Customizable in height & length to match your specific requirements, easy to transport, and can be carried onto any roof without major hassle. Equipment Supports are constructed of galvanized steel with continuous welded and mitered corner seams. They contain a wood nailer shrouded under a galvanized metal cover, allowing you to nail/secure roofing material directly to it.
Variable Frequency Drive VFD — What Is It, And Why Use It In HVAC?
A Variable Frequency Drive VFD, controls the speed of a three phase AC motor, while resulting in energy savings! It saves energy because the motor does not require as much current at lower speeds. Although it resembles the functionality of a multi-speed motor, it is very different.
HVAC Hold Down Brackets & Wind Certification — Beware Of Imposters!
The MicroMetl's Sales Department too often receives requests for Hold Down Brackets to meet wind code requirements. The common misconception; the brackets alone installed on a standard rooftop curb will fulfill wind code requirements. Perhaps the misconception is due...
HVAC Fan Types – Is a Fan Just A Fan?
HVAC Fan Types -- Is A Fan Just A Fan? - Not at all. It’s important to understand basic fan types to properly understand how to choose the best, most cost effective type for the job. Know your fan types. All fans are designed for the sole purpose of moving air. Most...
HVAC 101: Understanding V-Belts — Types, Sizing, Tension & Best Practices
In HVAC applications, belts are everywhere: supply fans, exhaust fans, blowers, power exhaust assemblies, and accessory drives. Before working in the industry, many people assume “a belt is just a belt.” But as soon as you’re specifying or replacing them, you learn...
Enthalpy vs. Dry Bulb Sensors — Understanding the Basics (Part I)
In HVAC control conversations, one of the most common questions customers face is deceptively simple: “Do you need Enthalpy or Dry Bulb sensors?” Before we compare the two, it’s important to understand a few fundamentals about temperature, humidity, and how the human...
What Is HVAC SEER & EER? — Understanding the Ratings That Drive Cooling Efficiency
In the HVAC world, SEER and EER are two of the most frequently referenced efficiency ratings. They tell you how much cooling you get for the energy you pay for—but the path to these ratings hasn’t always been clear. Before 1975, there was no universal standard for...
