You are in florida, correct?
If so, your summer nights are probably pretty warm. I am in Atlanta, GA, which has similar warm nights. Some growers nearby grow some highlanders fairly well.
The following highlanders can take lowland conditions.
N. alata
N. truncata (highland)
N. sanguinea
N. ventricosa
N. khasiana
N. maxima
N. copelandii
N. faizaliana
N. veitchii highland (hit or miss, some clones can take heat, others can't)
N. gymnamphora ( has a huge altitude range from 600-2800m, depending on the clone, you may or may not be sucessful)
All highland x lowland hybrids can grow as lowlands
highland x highland hybrids are hit or miss, but are generally more tolerant than highland species. However, a hybrid between two tricky highland species like N. sibuyanensis x hamata will be MUCH more difficult than a hybrid between an easy and a more difficult highlander like N. ventricosa x talangensis.