How long should termites be exposed to 140 degrees F in heat treatment?

In heat treatment for termite control, exposing termites to a temperature of 140 degrees Fahrenheit for a duration of four hours is crucial for ensuring effectiveness. At this temperature, the heat penetrates structural materials, effectively raising the internal temperature of the wood where termites may be hiding. This sustained exposure allows enough time for the heat to fully permeate the material, ensuring that all life stages of the termites, including eggs and nymphs, are killed.

Four hours at this temperature provides a sufficient safety margin to account for variations in wood density and moisture content, which may affect how quickly heat can penetrate. Treatments at shorter durations may not guarantee the elimination of the entire termite colony, especially if some individuals are deeper within the wood.

Thus, the correct choice of four hours ensures a thorough and effective treatment against wood-destroying pests.