There are some truly warm growing species out there, and a lot of intermediates. Masdevallia infracta might be considered an intermediate grower. The warm growers I've read about are:

M. anfracta
M. ayabacana
M. bennettii
M. crescenticola
M. demissa
M. lata
M. livingstoneana
M. martiana
M. naranjapatae
M. norae
M. sprucei
M. tonduzii
M. tubuliflora
M. vieriana

The ideal temperature ranges for these plants is 60.8 to 64.4°F (16 to 18°C) at night and from 68 to 80.6°F (20 to 27°C) during the day. But I bet they would adapt and not require such a large diurnal range.