Refrigerants
One page per refrigerant: regulatory status with dates and primary citations, a PT chart, replacement paths, and the equipment rated for it.
R-404A
GWP 3,922, A1 (no flame propagation)
R-404A legal status with dates and Federal Register citations, an interactive PT chart, replacement options, and equipment models rated for R-404A.
R-454B
GWP 466, A2L (lower flammability)
R-454B (Opteon XL41, Puron Advance): GWP 466, A2L safety class, regulatory status with citations, and an interactive PT chart.
R-448A
GWP 1,386 (computed per 40 CFR 84.64, commonly published as 1,387), A1 (no flame propagation)
R-448A (Honeywell Solstice N40) legal status under the 2026 interim GWP limits with Federal Register citations, an interactive PT chart, retrofit guidance, and equipment models rated for R-448A.
R-449A
GWP 1,397 (computed per 40 CFR 84.64), A1 (no flame propagation)
R-449A (Chemours Opteon XP40) legal status under the 2026 interim GWP limits with Federal Register citations, an interactive PT chart, retrofit guidance, and equipment models rated for R-449A.
R-290
GWP 3.3, A3 (higher flammability)
R-290 propane refrigerant: purchase rules, SNAP charge limits, safety class, an interactive PT chart, and where it fits in commercial refrigeration.
R-407C
GWP 1,774 (computed per 40 CFR 84.64), A1 (no flame propagation)
R-407C legal status with citations, an interactive PT chart with glide guidance, and commercial refrigeration models documented for R-407C.
R-407A
GWP 2,107 (computed per 40 CFR 84.64), A1 (no flame propagation)
R-407A legal status with citations, an interactive PT chart with glide guidance, and the commercial refrigeration models documented for R-407A.
R-744 (CO2)
GWP 1 (the reference gas), A1 (no flame propagation)
CO2 (R-744) as a refrigerant: why it passes every GWP limit, how transcritical operation changes the PT picture, and the walk-in unit cooler models rated for it.