  We study the prospects for charged Higgs boson searches in the $W \gamma$
decay channel. This loop-induced decay channel can be important if the charged
Higgs is fermiophobic, particularly when its mass is below the $WZ$ threshold.
We identify useful kinematic observables and evaluate the future Large Hadron
Collider sensitivity to this channel using the custodial-fiveplet charged Higgs
in the Georgi-Machacek model as a fermiophobic benchmark. We show that the LHC
with 300~fb$^{-1}$ of data at 14~TeV will be able to exclude charged Higgs
masses below about 130~GeV for almost any value of the SU(2)$_L$-triplet vacuum
expectation value in the model, and masses up to 200~GeV and beyond when the
triplet vacuum expectation value is very small. We describe the signal
simulation tools created for this analysis, which have been made publicly
available.
