Thermal deflector unit
Thermal deflector units used a variant of force field technology to generate a barrier against . The units could be tuned for varying efficiency levels of heat dissipation and deflection. As with most force fields, their efficiency varied inversely with the area of the field generated.

The units could be networked and cross-connected to generate a broader or stronger heat shield. Such a configuration required the units to be very precisely calibrated. Due to radiation and subspace interference often found in the environments where these devices were used, remote calibration was often not possible, thus experienced technicians may have needed to operate the units on-site.

Thermal deflector units were successfully employed to protect a colony on Bersallis III from fire storms while colonists were evacuated. The thermal barrier field was ultimately unable to deflect the path of the fire storms, however, and the colony structures were lost. Away team leader Lieutenant commander Nella Daren was able to reconfigure the deflector units to protect the team members by generating tightly focused, very intense deflection pockets reinforced with their hand phasers. Unfortunately, one of the units was unable to withstand the force of the fire storms and two team members were lost. ()

See also 
 Heat-dissipation unit

de:Wärmedeflektor
Shield technology