  We decribe properties of 2+1-dimensional Nambu-Jona-Lasinio (NJL) models at
finite-temperature, beginning with the model with a discrete chiral symmetry.
We then consider the model with a continuous $U(1) \times U(1)$ chiral
symmetry, describing the restoration of the symmetry at finite temperature. In
each case, we compute the free energy and comment on a recently proposed
constraint based upon it. We conclude with a brief discussion of NJL models
with larger chiral symmetries.
