What attracts fleas to a house?

Fleas are attracted to a house by several factors related to hosts, environment, and conditions that support their life cycle. The main attractant is presence of pets like dogs and cats that provide blood meals for adult fleas and carry fleas indoors from outdoors, as fleas jump onto pets during walks and then are brought inside where they lay eggs that fall off into carpets, pet bedding, and furniture. Warmth and humidity attract fleas because flea eggs, larvae, and pupae thrive in warm, humid conditions of 70 to 85 degrees Fahrenheit and 70 percent humidity, so homes with carpet, rugs, and pet bedding provide ideal breeding sites with organic debris and flea feces for larvae to feed on. Movement, vibrations, body heat, and carbon dioxide exhaled by humans and pets attract emerging adult fleas from pupal cocoons, as pupae wait for host cues to emerge. Clutter and lack of vacuuming allow flea eggs and larvae to accumulate undisturbed. Outdoor factors like wildlife such as raccoons, squirrels, and stray animals that bring fleas near house, and shaded, moist yard areas with tall grass where flea larvae develop, increase risk. Bringing in second hand furniture, rugs, or used pet bedding that is infested can introduce fleas. So pets, warmth, humidity, carpets, and wildlife near home attract fleas, and prevention includes regular pet flea treatment, vacuuming, washing pet bedding on high heat, and keeping yard clean and dry.