A completed mechanical job can look settled while one important question remains open: Did your company design an energy-efficient system for a public building?
That question deserves a controlled file review following an ACHR News report that projects already underway may still qualify under 179D. The story also notes that a contractor responsible for a public building's mechanical design may be owed a deduction that was never brought to its attention.
This is not a reason to assume every efficient retrofit produces a deduction. It is a reason to stop treating design records, project dates, and owner correspondence as paperwork that can be scattered once the final invoice clears.
Start with the work your company actually designed
Pulling every project from the accounting system will create noise. Begin with public-building jobs where your team did more than install equipment selected and specified by somebody else.
Look for records showing who established system capacities, selected equipment, developed controls sequences, laid out distribution, or revised the design when field conditions changed. The useful distinction is between performing installation work and carrying identifiable design responsibility. Do not settle that question from memory. Check the proposal, scope revisions, drawings, submittals, and closeout package.
If the documents conflict, flag the job for review instead of forcing it into a yes or no column. A proposal may describe design assistance while the final drawings identify another designer. That discrepancy matters more than the salesperson's recollection of the job.
Build a short results worksheet
Use one row per project and record the following:
Project: Building name and internal job number
Owner type: Public, private, or uncertain
Work status: Proposed, underway, completed, or canceled
Key dates: Contract, design, construction start, substantial completion
Mechanical scope: New system, replacement, controls, distribution, or mixed work
Design role: Installer only, design contributor, primary designer, or unclear
Supporting files: Contract, drawings, calculations, sequences, submittals, change orders
Outside contacts: Building owner, designer, accountant, or tax specialist
Open question: The exact fact or document still needed
Next action: Retrieve file, confirm role, request documentation, or close review
The worksheet should produce evidence, not a guessed tax result. Its job is to show which projects are complete enough for a qualified adviser to evaluate and which ones need document recovery first.
Do not let the cutoff erase the timeline
The ACHR News summary says projects already underway can still qualify. That makes dates central to the review, but a single invoice date will not describe the full project timeline.
Collect the dated contract, notices to proceed, design revisions, equipment orders, permit records in your possession, site reports, and completion documents. Keep the original files intact and make a review copy if notes must be added. If the company uses several systems for project management, accounting, and drawing storage, reconcile their job numbers so another person can reproduce the search.
A missing date is not proof that nothing happened. Mark it missing, identify the likely source, and assign someone to retrieve it. Clean uncertainty is more useful than a confident entry with no backing document.
Separate the technical file from the tax decision
Mechanical contractors know what they designed and installed. Tax professionals determine how the applicable rules affect a particular company and project. The handoff works best when the contractor supplies a compact, traceable technical record rather than a box of unrelated closeout files.
For each candidate project, create an index pointing to the contract, design documents, energy-related calculations, revision history, and evidence of the construction timeline. Record who prepared each item and whether it is final or preliminary. Do not edit old drawings to make the design role look clearer after the fact.
This review also exposes an operational weakness worth fixing. If your company cannot identify who designed a system, when construction began, or where the final calculations live, the problem extends beyond one deduction. Future warranty questions, controls changes, replacements, and owner handoffs will hit the same missing trail.
Finish by assigning every flagged job an owner and a due date. The practical win is not declaring a deduction from the conference room. It is producing a defensible project file that lets the right specialist answer the question without rebuilding the job from fragments.