This study focuses on the relevance and intensity of thermal equilibration in large-scale atmospheric blocking episodes. Other studies have not explored the relationships between long-duration blocking events and equilibration in much detail. We evaluate whether or not thermal equilibration becomes more evident in blocking episodes. We identify both wintertime and summertime large-scale blocking episodes over the North Atlantic and Europe using a dynamical blocking index on the NCEP/NCAR Reanalysis dataset. After identifying episodes, evidence of thermal equilibration is presented and analyzed through regional composites of atmospheric variables in blocked and non-blocked situations. Relationships between potential vorticity (PV) and streamlines are also described and presented through scatter plots. The results provide significant evidence that thermal equilibration is more probable in blocking episodes than in non-blocked states.