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How to Replace a Condensing Fan Motor

Service calls about condensing fan motor failure are quite common. Even though fan motor replacement is a standard proce

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Don’t Get Depressed (Unless You’re a Core)

This website is for professional HVAC techs and those actively learning to become professional HVAC techs, not DIY homeo

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Design and Performance Challenges of Air-Source Heat Pumps Across Diverse Climatic Conditions

This tech tip was inspired by Alex Meaney and Ed Janowiak’s session at NCI’s High-Performance Summit 2025: “Good Design

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Brownouts and How They’re Killing HVAC Equipment

HVAC technicians typically focus on diagnosing issues related to mechanical wear, refrigerant leaks, or control problems

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CAT Ratings on Electrical Multimeters

If you have a multimeter for HVAC work, you most likely have a meter with a CAT III rating on it. Some might also be rat

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AHRI Performance Data vs. Manufacturer Expanded Performance Data (and When to Use Each)

Equipment selection may seem like a pretty straightforward process: look at the data plate, find the tonnage that’s clos

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Field Guide to Crankcase Heaters

Crankcase heaters are a critical but often overlooked component in air conditioning and refrigeration systems. Their fun

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What Makes a Thorough Comfort Consultation

This tech tip is based on an HVAC School podcast episode with Tim De Stasio. Tim has written several articles about HVAC

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Compressor Failure: Diagnosis and Replacement Checklist for Residential and Light Commercial Equipment

Special thanks to Ty Branaman and Bert Testerman for their work and feedback on this tech tip about compressor failure.

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Scroll Compressors in a Changing Regulatory Landscape

This tech tip is based on an HVAC School podcast episode with Jeff Kukert and Tom Fesenmyer from Copeland. Jeff is the s

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Ducting Ventilating Dehumidifiers

This tech tip was written with the guidance of Nikki Krueger, the Director of Marketing & Business Development at Santa

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Measuring RTU Curbs with Adapters in Place

Each commercial rooftop unit (RTU) needs to be mounted to a curb. A curb supports the RTU and provides openings for the

Search results in Books

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Review of Vacuum for Service Engineers
Vacuum Science & Procedures

Review of Vacuum for Service Engineers

Revised by Jim Bergmann & Bryan Orr
Buy on Amazon
Refrigerant Charging and Service Procedures for Air Conditioning
HVAC Procedures

Refrigerant Charging and Service Procedures for Air Conditioning

Craig Migliaccio
Buy on Amazon
Bob’s House
HVAC Sizing and Design

Bob’s House

ACCA
Buy on Amazon
Commercial Refrigeration for Air Conditioning Technicians
Commercial Refrigeration in Plain Language

Commercial Refrigeration for Air Conditioning Technicians

Dick Wirz
Buy on Amazon
Refrigeration & Air Conditioning Technology
HVAC/R Textbook

Refrigeration & Air Conditioning Technology

John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Buy on Amazon
Fundamentals of HVACR
HVAC/R Textbook

Fundamentals of HVACR

Carter Stanfield, David Skaves
Buy on Amazon
Understanding Manual D
Residential Duct Design

Understanding Manual D

Jack Rise
Buy on Amazon
Electricity for Refrigeration, Heating, and Air Conditioning
HVAC/R Electrical Textbook

Electricity for Refrigeration, Heating, and Air Conditioning

Russell E. Smith
Buy on Amazon
The Home Comfort Book
Home Performance & Science

The Home Comfort Book

By Nate Adams
Buy on Amazon
Modern Hydronic Heating
Hydronic Heating

Modern Hydronic Heating

By John Siegenthaler
Buy on Amazon

Search results in Apps

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Browning® Toolbox Technician™

Browning® Toolbox Technician™

Regal Beloit America Incorporated

The FREE Browning® Toolbox Technician™ app delivers an indispensable toolset for all HVAC contractors and maintenance personnel, including calculation tools, conversion tools, GPS enabled distributor locator, plus informative reference, installation and troubleshooting guides for everything from bearings to v-belts. This app also features the revolutionary V-Belt ID Wizard™, empowering personnel in the field to quickly identify an installed belt, even when the product ID is unknown.

Browning® Toolbox Technician™ features:

- V-belt troubleshooting

- V-belt selection guide

- Bearing basics & FAQs

- Air handler bearing interchange

- V-belt ID Wizard™ with part lookup & product images

- Where to Buy with GPS option

- Various conversion tools

- Efficiency calculators

- Much more!

Ref Tools

Ref Tools

Danfoss A/S

The essential, all-in-one mobile app for air conditioning and refrigeration technicians

Get the guidance, support, information, and tools you need—on the job and infield. Ref Tools is a free, powerful app that contains essential tools every air conditioning and refrigeration technician needs in their digital toolbelt.

Previously known as Refrigerant Slider, Ref Tools represents the next digital evolution in the cooling industry. HVACR tools are becoming smarter, better, and easier to use, and Ref Tools puts them in the palm of your hand.

Our latest update greatly improves the in-app podcast experience—you can now subscribe to podcasts, enable notifications for new episodes, filter podcasts by language, and enjoy a new, streamlined player.

Measure Quick Hvac

Measure Quick Hvac

MeasureQUICK

With measure Quick HVAC you can diagnose system problems from the most trivial to the most complex.

Our powerful data aggregation tools, coupled with just-in-time education, will increase a technicians ability to solve problems on the job site, ultimately leading to a huge increase in productivity.

Measure Quick makes measurement science work!

HVAC School

HVAC School

By Techs for Techs

The app that helps you remember some things you forgot along the way, as well as helps you remember some things you forgot to know in the first place.For all current and aspiring HVAC technicians: HVAC School is the premiere source for knowledge and success in the HVAC industry.

With this app you can:

Listen to all episodes of the HVAC School podcast, a podcast committed to bringing you relevant and up to date knowledge of the HVAC industry and what it means to be an HVAC technician.

Read tech tip articles written by industry professionals on various topics to help build your knowledge base and understanding of HVAC theory

Interact with calculators that employ common HVAC equations to help build your understanding of important HVAC mathematics

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