1. Check professional references. Does the contractor have a good reputation in the community? If the company is a member of a respected industry organization—such as the Mechanical Contractors Association or the Chicagoland Better Heating-Cooling Council—it’s a good sign that the firm is reliable and qualified.

2. Request credentials from anyone who represents themselves as an “inspector.” Governmental and civic authorities will carry complete identification.

3. Do not let anyone have access to mechanical equipment before you are completely satisfied with respect to the authenticity and integrity of the firm or individual involved.

4. Take extra care if an unsolicited “repairman” or “contractor” calls. Don’t be pressured into doing anything before checking out their story. Find out who they represent. Call their company to see who sent them to you. Then check their company. Above all, disregard all “scare” talk.