The answer to 'how to prevent fumigation' is to use effective pest prevention methods that eliminate the need for fumigation. This includes regularly inspecting your home for signs of pests, sealing cracks and entry points, practicing good sanitation, and using targeted pest control treatments when necessary.
Fumigation is a last resort option that involves releasing toxic gases into a home or building to kill all pests. It is disruptive, expensive, and can pose health risks if not done properly. Preventing the need for fumigation is the best approach for most homeowners.