Modern Refrigeration and Air Conditioning, Althouse

Modern Refrigeration and Air Conditioning is one of the most widely used textbooks in HVACR (Heating, Ventilation, Air Conditioning, and Refrigeration) education. Written primarily by Andrew D. Althouse and later coauthored by Carl H. Turnquist and the Bracciano authors, the book is considered an industry-standard reference for students, apprentices, and HVAC technicians.

Purpose of the Textbook

The textbook is designed to teach both:

• Fundamental refrigeration and air-conditioning theory
• Practical service and troubleshooting skills

It prepares students for careers in:

• Residential HVAC
• Commercial refrigeration
• Air-conditioning installation
• System maintenance
• Energy management
• HVACR diagnostics and repair

Main Topics Covered

The book progresses from basic concepts to advanced HVACR systems. Major subjects include:

Refrigeration Fundamentals

• Heat transfer
• Pressure and temperature relationships
• Refrigeration cycles
• Refrigerants and environmental impacts
• Compressors, condensers, evaporators, and metering devices

Electrical and Control Systems

• Basic electricity
• Motors and motor controls
• Electrical troubleshooting
• Wiring diagrams
• Electronic controls and thermostats

Air Conditioning

• Psychrometrics (air properties)
• Humidity control
• Residential and commercial AC systems
• Heat pumps

Heating Systems

• Gas furnaces
• Electric heating
• Hydronic systems
• Oil burners

Commercial and Industrial Refrigeration

• Walk-in coolers/freezers
• Ice machines
• Supermarket refrigeration
• Chillers and large systems

Service and Troubleshooting

• System diagnostics
• Leak detection
• Refrigerant charging
• Maintenance procedures
• EPA safety standards and environmental regulations

Features of the Book

The textbook is especially valued for its hands-on instructional style. It includes:

• Hundreds of diagrams and illustrations
• Step-by-step service procedures
• Troubleshooting charts
• Real-world HVAC scenarios
• Safety guidelines
• Practice questions and lab activities
• “Thinking Green” environmental sections in newer editions

Teaching Style

The writing style is:

• Technical but beginner-friendly
• Organized in a logical sequence
• Heavy on visuals and practical applications
• Designed for vocational schools, trade schools, and community colleges

Many HVAC technicians describe it as a long-term reference manual rather than just a classroom textbook. HVAC professionals on Reddit often refer to it as “the big blue book” and praise it for covering “just about everything you’ll see out there.”

Editions

The textbook has gone through many revisions over decades:

• 18th Edition (2004)
• 19th Edition (2014)
• 20th Edition (2017)
• 21st Edition (2021)
• Newer editions continue updating refrigerants, environmental regulations, digital controls, and modern HVAC technologies.

Why It’s Important

This book is considered foundational because it bridges:

• Classroom theory
• Field diagnostics
• Installation practice
• Modern HVAC technology

It is commonly used in:

• HVAC certification programs
• EPA Section 608 preparation
• Trade apprenticeships
• Technical colleges
• Professional technician training programs

Official Publisher Information

• Goodheart-Willcox HVACR textbook page
• Online textbook overview