Rodents sense seasonal changes, so when winter comes they look for comfortable places to settle. I recently noticed some mice nesting on top of my water heater, and Richard Estrada, owner of ATCO Pest Control, a Diamond Certified company, explained why. “Many water heaters are wrapped with insulation, so they’re good, warm places for rodents to harbor.” Besides insulation, rats and mice use paper, twigs and other debris for nests.
Droppings aren’t the only clue that rodents have moved in to your home. Mr. Estrada suggests you walk around the perimeter of your house and look for openings and chew marks on the surrounding wood. Check the bottoms of doors, screens and garage doors. Another clue is smudge marks: As the critters travel through dirt and mud, they drag their bodies along and leave prominent smudges on surfaces.