The Electro-Gun is intended for treatment of localized infestations. If the infestations are extensive, or if they are in completely inaccessible areas, fumigation with heat or chemicals may be the only choices available. The KEY to protecting your home from extensive termite damage is regular checkups for early detection and treatment. Most operators offer a warranty on their work, so if termites do persist, you are not charged for a re-treatment. Probably not, unless further precautions are taken.
Termites swarm annually looking for a place to live.
If your home was treated successfully and all the termites were killed, but you still leave their tunnels behind uncovered, the tunnels will serve as ready-made condos for new swarms. To help reduce the possibility of reinfestations you should consider a borate or other residual treatment, spraying all unfinished exposed wood and injecting all tunnels making these areas unattractive to termites. Also you should consider caulking around all windows, removing all wood and debris under or next to your house, keeping your exterior wood properly painted, as well as placing a very tight meshed screen wire on all attic and subarea air vents. Most warranties cover one to two years. Beyond that the best course is regular maintenance and an annual inspection so that if a re-infestation does occur it can be treated early while still a localized infestation, thus keeping your cost down.