It is also important to gather other site related information to properly design the system and safely completing the installation work. This information includes:
Existing electrical supply, mains, and control wiring and fuel (e.g. natural gas) piping
Site hazards (e.g. vermiculite insulation, asbestos, knob and tube wiring)
Architectural and space constraints, including but not limited to an assessment of the mechanical room and potential sites for outdoor units
Trees and adjacent structures
Below grade walls, partitions, and other relevant structures
Relevant plans, sketches, and notes
A sample checklist for the job-site survey is provided below.