HVAC Basics

An introductory video explaining heating BTU's and how they relate to your home furnace. Heating British thermal unit BTU's are the most important factor when purchasing and sizing your next furnace. Without the proper BTU rating on your furnace, your furnace will not be able to heat your home adequately.

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In this video we'll be discussing system tonnage. Tonnage is a term that describes how much heat the AC unit can remove from a home in one hour. Click "Read More" to watch our video!

Watch our video on CFM to learn what it is and how it affects your HVAC system.

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in this video, you will learn what a heat pump is, how it works, and if it is right for you.

This video will help you understand how a furnace works and how a gas furnace can heat your entire home efficiently.

When replacing or updating your furnace or air handler you will need to know your system configuration. Click "Read More" to watch our video!

When selecting a new furnace, understanding the cabinet width is crucial for a seamless installation. Furnace cabinets typically come in standard widths—14.5", 17.5", 21", and 24.5"—which correspond to different airflow capacities and ductwork sizes. Choosing the correct width ensures optimal airflow, energy efficiency, and compatibility with existing duct systems. Before purchasing, measure your current setup and consult with HVAC professionals to determine the best fit for your home.

Understanding the difference between single stage, two stage, and variable speed air conditioners and heat pumps. When purchasing a new air conditioner or heat pump it is important to know the different options you have and how they will affect your efficiency and comfort.

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This video takes a look at the most common home HVAC system: Furnace and air conditioning split systems, also known simply as split systems. We'll walk you through what these systems are and how they work. There's a good chance that your home has a split system, so it's important to understand how your ac unit and furnace work together to heat and cool your home. Click "Read More" to watch our video!

Dual fuel HVAC systems combine an electric heat pump with a traditional gas furnace to deliver the most energy‑efficient home heating and cooling solution. By automatically switching to the gas unit when outdoor temperatures drop below the balance point, they ensure reliable warmth while optimizing energy costs in cold climates.

Do you want clean, freshwater and lower energy costs for your residence? In this video, we’ll discuss tankless water heaters and the benefits of installing one in your home.

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Learn how to buy your HVAC system online!

Simply take your shopping list of your system needs and use those specifications to filter down to the right HVAC system for your home. Start by going to the top navigation, selecting the type of equipment you are looking for.

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In this video, you will learn how to use our EZ install kit for ductless mini split systems. The EZ install kit allows you to install a ductless mini split without a contractor and save you hundreds on installation costs.

Looking to heat or cool a room without hiring a pro? A DIY mini split from HVACDirect.com is the easy, affordable way to add climate control to any space. Learn how to install a DIY mini split system with our step-by-step guide with video and see why it's a smart upgrade.

With the right parts and tools, owners of almost any brand or type of mini split can now self-install their system. IMPORTANT: This how-to guide is not written to add, remove, or adjust refrigerant levels. Its only purpose is to explain how to install the line set and remove air from the system. All refrigerant used comes pre-charged from the factory in the condenser unit. If adding, removing, or adjusting refrigerant is necessary, please STOP immediately and contact a licensed HVAC technician for assistance.

Your gas furnace's flue pipe is a very important component of your home HVAC system - and this video covers why it's important and what you need to know about it. We'll tell you what a flue pipe is and what it does; we'll also cover the different types of flue pipes and how they pair with different types of furnaces. (Note: This video is for demonstration purposes only and should not be repeated at home. Always have a licensed HVAC technician install your furnace or AC system.)

There are many different acronyms by which efficiency is labeled. You have probably heard of some like EER, HSPF, or SEER but what exactly do they mean and what process do they use to determine these numbers? Well I am here to explain and better help you with future purchases in the HVAC world.

Blower motors are a crucial part of every furnace. Before you purchase your next furnace it is important to understand the different types of blower motors and how they affect you.

The #1 question we get is “How much does it cost?” The most common answer is, “It depends.” But in this article, we’ll break that cost down so that you have a much better idea of what to expect when you’re shopping.

Ductless mini split systems have multiple air handler options to choose from. Depending on the type of space you're heating, each one has its own pros and cons. In this video, we will show you the different mini split air handler types to help you decide which one would be best for your home's HVAC system

Multi-zone mini split systems let you control temperatures individually in each room, improving comfort and lowering energy costs. In this video, we walk you through how to calculate the heating and cooling load of each zone—considering room size, insulation, windows, and usage—to determine the right number and capacity of air handlers for your home. Proper sizing ensures even temperatures, efficient energy use, and longer system life.

Use this glossary of HVAC (heating, ventilation, and air conditioning) terms and definitions to make better purchasing decisions. Save time and money purchasing at HVACDIRECT.COM |Buy Direct & Save Thousands On New Furnace and Air Conditioning Systems. 5-Star Customer Service. Free Shipping. Ready To Ship. Large Selection.