Wesley Heating & Cooling Listed by sinobi Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

Wesley Heating & Cooling, an HVAC company based in Green Bay, Wisconsin, was listed by the sinobi ransomware group on January 5, 2026. The listing states that internal files were exfiltrated during a ransomware attack on the organization. The number of individuals affected is not known, and no further details on the scope or contents of the data have been made public. This incident matters because the company has provided heating, cooling, and air-conditioning services to homeowners in Green Bay, Oshkosh, Fond du Lac, and nearby areas since 1951. Customers who have arranged repairs, replacements, maintenance plans, or financing may have records held by the firm, and any exposure of those records creates uncertainty about how their information could be used.

Inside the incident

The only confirmed information is the January 5, 2026 listing by sinobi and the statement that internal files were taken. No count of affected individuals, no description of the intrusion method, and no timeline for the attack itself have been released. The organization has not issued a public statement confirming or disputing the listing.

Inside sinobi

Sinobi is a ransomware group that targets organizations, exfiltrates data, and posts victim names on a leak site when ransom demands are not met. The group’s listings function as a public claim of access rather than verified proof of the data’s authenticity or extent. Similar listings by the same actor have involved a range of sectors, with the group typically asserting that stolen files will be released or sold if payment is withheld.

Wesley Heating & Cooling and its sector

Wesley Heating & Cooling operates as a regional HVAC provider offering repair, replacement, and ongoing maintenance for residential heating and cooling systems, including geothermal heat pumps and ductless units. Companies in this sector routinely collect customer names, addresses, service histories, and payment or financing details to deliver work and manage maintenance plans. A listing involving such an organization raises questions about records that may contain both operational information and personal data belonging to local residents.

What data was at risk

The listing refers only to “internal files exfiltrated in ransomware attack.” No specific categories of data have been confirmed. Organizations of this type commonly hold customer contact information, service records, and limited financial details related to financing or maintenance agreements, yet the precise contents of the exfiltrated material remain undisclosed.

What's at stake

Individuals whose information appears in the files face the possibility that contact details or service records could be used for targeted phishing or identity-related fraud. The organization itself may experience operational disruption and costs associated with investigation and response. Because the number of affected people and the exact data types are unknown, the full extent of these risks cannot be quantified from public information.

What to do if you're exposed

Anyone who has been a customer of Wesley Heating & Cooling should monitor bank and credit accounts for unusual activity and consider placing a fraud alert with one of the major credit bureaus. Changing passwords for any online accounts linked to the same email address used with the company is a prudent step. Readers can also run a free exposure scan of their email address against known breach data to check whether their information has appeared in other incidents.

AICompiled with AI assistance from public sources and published under our editorial standards.