Books on HVAC and Refrigerant Concepts
There are many books you can find that will get you a head-start in HVAC and Refrigerant concepts.
These are our Top Picks from Amazon.
Disclaimer
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Please note that Environmental Protection Agency law requires certain individuals to be licensed before purchasing some refrigerants. You will be required to provide your certificate number or declare the item will be resold to an EPA certified technician on certain types of Refrigerant. (R-410A & R-134A are excluded from this.)