Abstract: High spatiotemporal resolution observations of the He I 10830 Å line, acquired with the Goode Solar Telescope (GST) at the Big Bear Solar Observatory (BBSO), are utilized to investigate the transition region emission, temperature structure, and their coupling with the photosphere and chromosphere in an EUV moss region located above a chromospheric plage. Complementary EUV observations and Differential Emission Measure (DEM) analysis are derived from the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO). Based on the absorption characteristics of He I 10830 Å, the target EUV moss region is categorized into Enhanced Absorption Patches (EAPs) and Less Absorption Patches (LAPs). The data analysis confirms two previously established results: (1) the density of high-temperature plasma above EAPs is systematically higher than that above LAPs; and (2) EAPs are primarily co-spatial with photospheric intergranular lanes. In contrast to previous findings, however, this study reveals that the plasma temperature above EAPs is significantly higher than that above LAPs, implying that the thermal pressure above EAPs exceeds that of the surrounding environment. Furthermore, the observations exhibit distinct fast-varying components in the EUV emission above EAPs. These findings highlight the unique diagnostic capability of He I 10830 Å narrowband observations for coronal heating studies and offer critical constraints for distinguishing between various coronal heating models.