PVT properties are presented for both the gas-phase and liquid-phase, vapor pressures and saturated-liquid densities for hydrofluoroether (HFE) refrigerants, trifluoromethyl methyl ether (CF3OCH3) and pentafluoroethyl methyl ether (C2F5OCH3), that were obtained with a Burnett apparatus and a vibrating-tube densimeter. A total of 250 liquid densities and 70 gas-phase PVT properties for CF3OCH3 and 281 liquid densities and 125 gas-phase PVT properties for C2F5OCH3 were obtained in wide ranges of temperature (240 to 380) K and pressure up to 7 MPa with a rapid density measurement system with a vibrating-tube densimeter. For CF3OCH3, 109 gas-phase PVT properties were obtained with a Burnett apparatus at the temperatures (300 to 380) K and up to nearly the critical density. On the basis of the present measurements, we have also developed thermodynamic models to complement the experimental data. Equations of state for the liquid phase and truncated virial equations of state are discussed in this paper, as well as a couple of correlations for vapor pressures and saturated-liquid densities.