How the EPA 608 exam is organized, how many questions each section has, what score you need and how to prepare.
What the EPA 608 exam is like: sections, questions and how to prepare Read More »
What A2L means, why new air conditioners use R-454B and R-32, and what precautions these refrigerants call for.
A2L refrigerants: what they are and why air conditioners are changing Read More »
The refrigeration cycle in four steps: compressor, condenser, expansion and evaporator, explained simply.
How an air conditioner works: the refrigeration cycle made simple Read More »
Overload, short circuit and ground fault: why a breaker trips and what GFCI and AFCI devices do.
Why does a breaker trip at home? The three most common causes Read More »
