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Can heat kill roaches and their egg cases? It can work, but only when hidden spots get hot enough and stay there long enough. In practice, cooler pockets under appliances, inside wall voids, or in clutter often stay below lethal levels. This is why DIY cockroach control attempts with space heaters and hairdryers are unlikely to eliminate a cockroach infestation.
Using temperature to kill roach eggs and roaches isn’t a perfect solution, but sustained temperatures below 45°F and above 120°F should kill most species. The point is, this is very hard to achieve in practice.
Cockroaches are notoriously hardy pests, and it often takes a professional inspection and cockroach control to eliminate infestations and help prevent them from returning.
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