Hvac and Refrigeration System

A complete reference book on refrigeration and air conditioning, covering the refrigeration cycle, refrigerants, system components, air conditioning, and hands on servicing. One of the most comprehensive free titles in this list.

SCERT

University lecture notes that build refrigeration and air conditioning from the ground up, unit by unit. Covers vapor compression and absorption systems, refrigerants, psychrometry, and cooling load with worked detail.

Institute of Aeronautical Engineering

A university lecture series on air conditioning and refrigeration, with a strong focus on psychrometry, cooling load, and air conditioning processes. Full of diagrams and solved examples for engineering students.

Mushtaq Ismael Al-Ebrahimy

A reference chapter on refrigerants, their properties, performance, and safety classifications, plus the phaseout of ozone depleting substances. A handy technical guide to choosing the right working fluid.

ASHRAE