Davis-Houk Mechanical, Inc. is a full-service firm serving all of downstate Illinois. DHM is a leading provider of plumbing, ... piping, and HVAC systems for commercial, industrial and institutional customers. The company has extensive experience in both Design/Build and competitive bid projects. Flexibility, depth of knowledge and experience. When you work with DHM, you decide on the scope of the project. Then you can trust that we have the capability and expertise to finish the project – on time and within your budget. read more