Thermostat Checks During an Inspection

31 August 2023

A thermostat is one part of a heating or cooling arrangement. Its response during a visit does not establish the condition of every component or the comfort of every room.

A practical approach

Ask which system the control serves and what operating observations were made. Keep multiple zones or separate units clearly labeled. If the control or system behaves unexpectedly, use the relevant professional and equipment instructions rather than repeatedly changing settings to experiment. Record any untested functions for follow-up.

A system starting is not a full performance test

Heating and cooling observations depend on equipment type, access, outdoor conditions and the agreed scope. Starting a system can reveal some concerns without establishing its performance under every load or season. A general inspection is not a substitute for a specialist service, combustion analysis or a detailed design assessment.

Ask what was operated, what could not be checked and why. Keep service history and equipment information available, especially where several systems serve different parts of the house. A room that feels uncomfortable may involve controls, distribution, insulation or other building conditions rather than a single failing unit. A qualified heating and cooling professional should explain which observations support the proposed work instead of treating replacement as the automatic answer to every comfort complaint.

Identify the type of heat before comparing findings

A house may use a furnace, boiler, heat pump, electric heaters or a combination of systems. Those arrangements have different components and maintenance needs. Begin by identifying what serves each area and which equipment the inspector could access. A generic comment about "the heater" can be confusing when the property contains more than one system.

Service records help establish what work was performed, but they should be read alongside present observations. An old service sticker is not a current condition assessment. Ask an appropriately qualified professional about unresolved concerns, especially where fuel-burning equipment or damaged electrical components are involved. Keep operating instructions and emergency contact information accessible. Do not adjust unfamiliar combustion, pressure or safety controls during a homeowner walkthrough.

Create one reliable home information file

A home information file can hold the inspection report, equipment manuals, service records, repair photographs and relevant approvals. Organize it by system or location so a future question can be answered without searching through unrelated messages. Keep original documents and use descriptive filenames rather than relying on memory.

Distinguish an estimate, an invoice and a completion report. They document different stages and should not be treated as interchangeable proof. Record known gaps as well as available information. A note that a concealed area was not inspected is useful context for future work. Back up digital records and avoid sharing occupants' personal information unnecessarily. The aim is a usable building history, not a large folder of documents whose meaning is unclear.

An example to work through

A house with separate upper and lower systems may have similar-looking controls. Labeling them correctly prevents a result from one system being mistakenly applied to the other.

What to check

Match controls to equipment.
Record the actual response observed.
Keep separate systems clearly identified.

Sources and further guidance

ASHI: home inspection scope and standards