Refrigerant Charging and Service Procedures for Air Conditioning WORKBOOK

This workbook is a great companion for anyone who learns best through repetition.

Refrigerant Charging and Service Procedures for Air Conditioning by Craig…

I like that this textbook includes practice problems with full answer keys.

VTG National Technical Schools Air Conditioning Refrigeration HVAC Course Books

You will find that this study guide fills in gaps left by the textbook.