Fumigation
Fumigation is mainly used for widespread drywood termite infestation when activity is distributed through multiple parts of the home. It can be effective for whole-structure eradication, but it requires planning, temporary vacancy, and follow-up prevention because it does not stop reinfestation by itself.
Localized vs. whole-house treatment
Localized treatment can make sense when inspection confirms a small, contained problem. Whole-house treatment is more defensible when infestation is widespread, hidden in multiple zones, or moving faster than spot work can reasonably control.