What should an HVAC inspection cover before closing?

Start with an independent whole-home inspection, then order an HVAC-specific evaluation when the result could change your offer, repair request, or replacement budget. The CFPB distinguishes a buyer’s inspection from an appraisal and recommends an inspector who is accountable to the buyer (CFPB). An appraisal is not a substitute for a condition review.

The useful result is not “the AC turned on.” It is a record of what was observed, what was measured, what documents support the history, what could not be tested, and what needs a price before closing.

Ask for records before the inspection period runs out

Request these items early enough to investigate gaps:

invoices for installation, maintenance, and major repairs;
warranty registration and transferable coverage details;
model and serial numbers for the outdoor unit, indoor coil or air handler, furnace if present, and major controls;
permit and inspection records for HVAC, electrical, gas, roof, elevation, and renovation work;
seller disclosures and documentation of prior water or storm damage;
recent utility bills, with the understanding that occupant habits and weather affect them;
any load calculation, duct design, commissioning report, or balancing report.

New Orleans lets the public search permits and violations by street address through One Stop (City of New Orleans). A matching permit can corroborate a work date and scope. A missing search result does not prove work was unpermitted: records, address formats, older work, and permit requirements can differ. Ask the City when the answer matters.

Record the equipment without guessing its age

Photograph visible rating plates. Record the full manufacturer, model, and serial number; do not rely on a seller’s estimate or the age of only the outdoor cabinet. The indoor and outdoor sections may be different ages or an unmatched combination.

Use the manufacturer’s current lookup, warranty certificate, installation invoice, or permit to decode the record. Carrier, for example, asks for a serial number from the rating plate but warns that its online result is a guide and may not contain complete warranty information (Carrier). That is why a serial decoder should return a confidence level, not a made-up exact date.

Age is planning evidence, not a condition test. It can change the likelihood and consequence of a future repair, but it does not establish capacity, installation quality, current efficiency, or remaining life.

Separate observations from measurements

Evidence	What it can tell you	What it does not prove
System starts and makes cool air	Controls and cooling operated during the visit	Capacity on a design-hot day, refrigerant charge, or future reliability
Clean cabinet and recent filter	Visible maintenance at that moment	Clean coils, correct airflow, or good ducts
Supply and return temperature readings	A snapshot under stated indoor and outdoor conditions	A diagnosis by themselves
Model and serial plates	Equipment identity and a path to age records	Installation date, match, condition, or warranty transfer
Permit or invoice	Documented scope and date	That every part of the installation still performs correctly
No visible water or corrosion	No obvious problem in the areas viewed	No hidden drain, flood, or moisture damage

An HVAC evaluation should state the weather, thermostat settings, run time before readings, and access limitations. When conditions permit, ask the professional to evaluate:

cooling and heating operation in all installed modes;
temperature, humidity, and airflow patterns at representative rooms;
blower airflow or static pressure when the decision requires measurement;
visible coil, cabinet, drain, pan, trap, and condensate-disposal condition;
accessible supply and return ducts, insulation, leakage signs, and return-air paths;
electrical disconnects, overcurrent protection, wiring condition, and equipment data;
refrigerant-circuit performance using appropriate instruments, without declaring charge from temperature split alone;
furnace or other combustion safety when the system includes fuel-burning equipment;
thermostat, zoning, ventilation, and dehumidification controls;
whether equipment combinations and installation details match manufacturer requirements.

ENERGY STAR’s quality-installation guidance treats sizing, airflow, refrigerant charge, and ducts as connected issues, not visual impressions (ENERGY STAR). Its commissioning materials use actual airflow, fan-power, and refrigerant-charge checks for new certified homes (ENERGY STAR). An occupied resale house may not justify every commissioning test, but the evaluator should say which tests were and were not performed.

Check ducts, drainage, and the house around the equipment

Look beyond the machinery. Record crushed or disconnected flex duct, torn insulation, staining, rust, biological growth-like material, blocked returns, damaged platforms, poor service access, and condensate discharge locations.

A room that stays hot may reflect solar gain, air leakage, a closed path back to the return, duct damage, low airflow, or system capacity. A short inspection cannot select among those causes without evidence. Ask for the next test rather than accepting a confident guess.

Investigate flood and storm exposure separately

Check the current FEMA flood map and insurance implications, but do not treat a flood zone as a property damage history. FloodSmart says every home has some flood risk and that maps describe levels of risk (FloodSmart). Ask where the outdoor unit, indoor equipment, electrical panels, controls, ducts, and generator sit relative to known flood elevations and observed high-water evidence.

Look for corrosion lines, replaced lower panels, fresh paint over rust, mismatched components, elevated equipment, and repair invoices. These are questions, not proof. FEMA explains that flood risk to HVAC components depends on their location and elevation and describes elevating vulnerable utilities as mitigation (FEMA).

Ask the seller for prior flood information and documentation allowed by the transaction. Do not promise that a public claims search will reveal the property’s history: the NFIP says a prospective buyer generally cannot obtain a prior owner’s individual flood-claim record without the required authorization (FloodSmart). Obtain an insurance quote and clarify needed disclosures with the appropriate real-estate and insurance professionals.

Turn findings into a buying decision

Ask for a short report with five parts:

Observed facts: equipment IDs, operating conditions, photos, measurements, and records found.
Immediate concerns: safety, active leaks, failed operation, or damage needing action.
Unresolved questions: inaccessible ducts, unsuitable weather, missing records, or tests not performed.
Scoped next work: the specific diagnostic, repair, or design step needed and who is qualified to do it.
Budget evidence: itemized repair and replacement proposals when cost affects the transaction.

Do not ask an inspector to guarantee years of remaining life. Decide using the combination of verified age, present condition, measured performance, installation quality, repair history, flood exposure, access, parts and refrigerant context, and the cost of failure after closing. If uncertainty is material, price the uncertainty or extend the investigation instead of turning a visual snapshot into a promise.

Sources

CFPB — Schedule a home inspection, accessed 8/12/2026
ENERGY STAR — HVAC quality installation, accessed 8/12/2026
ENERGY STAR — Requirements and resources for HVAC contractors, accessed 8/12/2026
City of New Orleans — Search permits and violations, accessed 8/12/2026
FEMA — Protecting building utility systems from flood damage, accessed 8/12/2026
FloodSmart — Know your flood risk, accessed 8/12/2026
FloodSmart — NFIP policies and claims data FAQ, accessed 8/12/2026
Carrier — Warranty lookup, accessed 8/12/2026