  We study the thermal structure and energetics of the point-like EUV
brightenings within a system of fan loops observed in the active region
\textsl{AR~11520}. These brightenings were simultaneously observed on 2012 July
11 by the HIgh-resolution Coronal (Hi-C) imager and the Atmospheric Imaging
Assembly (AIA) on board the Solar Dynamics Observatory (SDO). We identified 27
brightenings by automatically determining intensity enhancements in both Hi-C
and AIA ~193~{\AA} light curves. The energetics of these brightenings were
studied by using the Differential Emission Measure (DEM) diagnostics. The DEM
weighted temperatures of these transients are in the range $\log{T} (K) = 6.2 -
6.6$ with radiative energies ${\approx}10^{24-25}$~ergs and densities
${\approx}$ a few times $10^{9}$~cm$^{-3}$. To the best of our knowledge, these
are the smallest brightenings in EUV ever detected. We used these results to
determine the mechanism of energy loss in these brightenings. Our analysis
reveals that the dominant mechanism of energy loss for all the identified
brightenings is conduction rather than radiation.
