German cockroaches favor warm, humid spaces near food and water — kitchens, behind appliances, under sinks — and Roberts's a humid continental climate with cold, snowy winters and warm, humid summers, colder in the north than the southeastern corridor keeps them active most of the year. American cockroaches, larger and reddish-brown, prefer basements, drains, and utility rooms. A blend of older agricultural-area homes and forest or lake-adjacent cabins, built with real winter cold in mind.
Treatment starts with locating the harborage points — the tight, warm, food-adjacent spaces roaches actually live in — and applying gel bait directly there rather than spraying open floor space. This targets the colony at its source and avoids the resistance issues that plague over-the-counter sprays. We follow up to verify the population has collapsed, not just scattered.