Vehicles built since the mid-2010s use R-1234yf, and it is not interchangeable with R-134A. What changes for shops servicing both.

Two R-404A replacements with almost identical performance. Here is what genuinely separates them and why the decision often comes down to something other than the datasheet.

The order of operations for converting an R-22 system, and the three steps most often skipped that cause the callback.

Three R-22 replacements that work with the oil already in the system. They are close enough that the choice usually comes down to two practical questions.

Soap bubbles, UV dye, electronic sniffers and infrared sensors. What each method actually finds, where it fails, and when to reach for which.

Virgin, reclaimed and recovered mean three different things, and only two of them are legal to sell. Here is how to tell what is in the cylinder.

Pallet pricing is where the cost per cylinder actually comes down. Here is how to work out which tier fits your volume without tying up capital or floor space.

R-32, R-454B and R-1234yf are all A2L. Here is what mild flammability actually means on a service call, and what it does not.

From 2.5 LB top-up cylinders to 30 LB service size. How to stock a van without carrying weight you never use or running short mid-call.

R-404A has one of the highest GWPs still in commercial use and the phase-down is closing in. Here is how the three main replacements differ and which suits which system.