Rodents gnaw on electrical wires. These “open wires” can cause house fires.

Mice and rats use insulation as bedding. Once its contaminated with urine an pheromones, the energy efficiency drops and the smell becomes a part of the house. Rats and mice leave behind salmonella, hantavirus and leptospirosis which make human sick.

Cockroaches drop detrtius (skin and waste) which becomes airborne. This is a cause of chronic respiratory issues.