In addition to reducing heat conductance, the thermal break in the construction of metal window frames does which of the following?

A thermal break in metal window frames interrupts the conductive path of heat through the frame,

reducing heat transfer.

This reduces the chance that the interior surface of the frame will drop below the dew point

temperature, thereby reducing condensation (surface moisture buildup).

Thermal breaks do not increase air infiltration; they help maintain thermal performance.

They reduce sound transmission, so B is incorrect.

Thermal breaks typically increase cost and complexity, so D is incorrect.

Reference:

NCARB ARE 5.0 Review Manual, Building Enclosure and Materials chapters

Fenestration performance and condensation control guides