Originally posted by wyoming
recently also purchased and read the volumes 1,2,3 of the Audel hvac fundamentals. found them very helpful and for the price affordable for the information contained in them.

Even though the fundamentals remain the same, the Audels books are a bit out of date.

In addition, the book "Modern Refrigeration and Air Conditioning" by Althouse, etc... is also out of date and contains a few errors. Is more of a reference book than a textbook too. There are better.