This study evaluates the fuel properties and energy performance of hydrochar produced through co-hydrothermal carbonization (Co-HTC) of swine manure (SM) and coffee waste (CW). Reaction temperature (160 °C, 200 °C, 240 °C) and SM:CW mixing ratio (1:1, 3:1, 5:1) were varied to examine their effects on carbonization behavior, energy densification, and combustion characteristics. The hydrochar yield (HY), except at 160 °C (3:1), ranged from 53.4% at 240 °C (1:1) to 67.6% at 160 °C (5:1), with highe