What Insurance Carriers Should Ask When Evaluating an HVAC or Plumbing Loss

Insurance carriers and their subrogation counsel face a recurring challenge in HVAC and plumbing loss evaluations: distinguishing a covered sudden and accidental loss from a maintenance failure, a design defect with subrogation potential, or a pre-existing condition that was misrepresented at underwriting. A forensic mechanical engineer can help answer those questions before litigation — and build the technical foundation for recovery if the facts support it.

The Right Questions to Ask at First Notice

When a property loss involves HVAC or plumbing systems, the carrier’s investigation should begin with a structured engineering assessment. The questions that matter most are not whether the equipment failed — obviously it did — but why it failed, when the failure mode began, whether the failure was sudden or progressive, and whether a third party contributed to the conditions that caused the loss.

Equally important: was the equipment maintained as required by the policy? Lack of maintenance is a coverage defense in many property policies, and an engineering inspection can identify deferred maintenance that a general adjuster may not recognize. Clogged condensate drains, dirty coils, failed heat exchangers, and seized compressors all show visible evidence of prolonged neglect that a forensic inspection can document.

Common Loss Categories in HVAC and Plumbing Claims

Water intrusion from HVAC systems is among the most litigated property loss categories. The source could be a failed condensate line, a cracked condensate pan, a failed secondary drain, or improper installation of a fresh air intake that allows rain infiltration. Determining which of these caused the loss — and whether the installation was compliant — drives both coverage and subrogation analysis.

Refrigerant system failures resulting in compressor burnout are frequently disputed between the carrier, the equipment manufacturer, and the installing or servicing contractor. The question is whether the failure resulted from a manufacturing defect, a refrigerant charging error, an electrical fault, or improper servicing. Each of these points to a different responsible party.

Gas system failures — including furnace fires, gas leaks, and CO exposure — require tracing the failure to either equipment defect, installation non-compliance, or maintenance failure. The manufacturer’s installation instructions are the baseline document for this analysis.

Freeze damage to mechanical systems in unoccupied buildings raises questions about whether freeze protection was designed into the system, whether the insured complied with occupancy warranty requirements, and whether a contractor’s work on the heating system contributed to the freeze event.

What an Engineering Evaluation Should Produce

A thorough forensic engineering evaluation of an HVAC or plumbing loss should produce a written report that identifies the failure mechanism with specificity, traces it to its root cause, documents the physical evidence, evaluates the installation against applicable codes and manufacturer instructions, identifies any maintenance deficiencies, and states opinions on causation and, where appropriate, on the party responsible for the conditions that caused the loss.

This report is the foundation for subrogation demand letters, coverage declinations, and expert disclosure in litigation. It needs to be technically defensible — capable of withstanding cross-examination — and written in language accessible to a jury.

Working with Carriers and Subrogation Counsel

I work with insurance carriers and their attorneys at all stages of the claims process — from initial loss investigation through trial. I’m available to consult confidentially on cases in the Mountain West and nationally. If you have an HVAC or plumbing loss where the cause or responsible party is unclear, I’m happy to discuss the engineering aspects of the case.