  We consider fifty transiting short-period giant planets for which eclipse
depths have been measured at multiple infrared wavelengths. The aggregate
dayside emission spectrum of these planets exhibits no molecular features, nor
is brightness temperature greater in the near-infrared. We combine brightness
temperatures at various infrared wavelengths to estimate the dayside effective
temperature of each planet. We find that dayside temperatures are proportional
to irradiation temperatures, indicating modest Bond albedo and no internal
energy sources, plus weak evidence that dayside temperatures of the hottest
planets are disproportionately high. We place joint constraints on Bond albedo,
$A_{B}$, and day-to-night transport efficiency, $\varepsilon$, for six planets
by combining thermal eclipse and phase variation measurements (HD 149026b, HD
189733b, HD 209458b, WASP-12b, WASP-18b, and WASP-43b). We confirm that planets
with high irradiation temperatures have low heat transport efficiency, and that
WASP-43b has inexplicably poor transport; these results are statistically
significant even if the precision of single-eclipse measurements has been
overstated by a factor of three. Lastly, we attempt to break the
$A_{B}$-$\varepsilon$ degeneracy for nine planets with both thermal and optical
eclipse observations, but no thermal phase measurements. We find a systematic
offset between Bond albedos inferred from thermal phase variations ($A_{B}
\approx 0.35$) and geometric albedos extracted from visible light measurements
($A_{g} \approx 0.1$). These observations can be reconciled if most hot
Jupiters have clouds that reflect 30-50 per cent of incident near-infrared
radiation, as well as optical absorbers in the cloud particles or above the
cloud deck.
