  The habitability of exoplanets can be strongly influenced by the presence of
an exomoon, and in some cases the exomoon itself could be a possible place for
life to develop. For moons outside of the habitable zone, significant tidal
heating may raise their surface temperature enough to be considered habitable.
Tidal heating of a moon depends on numerous factors such as eccentricity,
semimajor axis, size of parent planet, and presence of additional moons. In
this work, we explore the degree of tidal heating possible for multi-moon
systems in resonance using a combination of semi-analytic and numerical models.
This demonstrates that even for a moon with zero initial eccentricity, when it
moves into resonance with an outer moon, it can generate significant
eccentricity and associated tidal heating. Depending on the mass ratio of the
two moons, this resonance can either be short-lived ($\leq200$ Myr) or continue
to be driven by the tidal migration of the moons. This tidal heating can also
assist in making the exomoons easier to discover, and we explore two scenarios:
secondary eclipses and outgassing of volcanic species. We then consider
hypothetical moons orbiting known planetary systems to identify which will be
beast suited for finding exomoons with these methods. We conclude with a
discussion of current and future instrumentation and missions to better
understand how practical it will be to make exomoon discoveries in these ways.
