Cosgriff Climate Control

Cosgriff Climate Control, now operating under the Randalls Heating and Cooling brand following a recent acquisition, has served Hermantown, Minnesota since its founding. The contractor maintains an exceptional 5.0-star rating from 32 verified customer reviews, a testament to consistent service quality in the Duluth metro area. Operating 24 hours daily, seven days a week, the company provides residential heating and cooling solutions across Hermantown and surrounding St. Louis County communities, maintaining the original phone number (218) 729-7118 for customer convenience.

Following its acquisition by Randalls Heating and Cooling, the company now benefits from expanded resources while preserving the same local service team. Reviewers consistently highlight honest diagnostic practices, multiple customers report receiving second opinions that saved them from unnecessary equipment purchases. The technicians emphasize transparent pricing and explain repairs thoroughly, ensuring homeowners understand exactly what work their systems require before proceeding.

Customer reviews reveal the technical expertise behind those five-star ratings. Mark, the lead technician mentioned by name across multiple reviews, responded to an after-hours furnace emergency within one hour for one Hermantown family. Another reviewer describes Mark completing a water heater replacement in just over an hour on a Monday, arriving on-time and explaining temperature settings before departing. A third customer notes Mark helped limped their aging boiler through final cold days before installing a replacement, demonstrating the personalized approach that earned this contractor its reputation.