Checklist · 21 items
The Homebuyer's HVAC Inspection Checklist
A general home inspector is a generalist: they confirm the system runs on the day of the visit. What they usually don't evaluate is its age, condition, sizing, ductwork, or remaining life, exactly the things that decide whether you're buying a comfortable house or a five-figure surprise. Walk the house with this list, check items off as you go, and it saves your progress on this device.
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Cooling system
Why it matters: St. Louis summers are the stress test, an AC at end of life fails in July, not at the inspection.
Heating system
Why it matters: The furnace is both a comfort and a safety system, its age and service history matter more than how it looks.
Ductwork & airflow
Why it matters: Ducts are half the system, leaky or crushed runs waste money and create the hot-upstairs problem no thermostat fixes.
Thermostat, humidity & extras
Why it matters: The small stuff reveals how the house was cared for, and what your first-year costs look like.
Paperwork & history
Why it matters: Service records and permits tell you the system's real story, and give you negotiating leverage.
The technician's half
What Swiss Air checks that this list can't
This checklist catches what's visible. The condition calls that actually price a system, heat-exchanger integrity, refrigerant charge, capacitor strength, amp draws against nameplate, combustion safety, take instruments and a licensed technician. A pre-purchase HVAC evaluation (or a first tune-up the month you move in) turns the mystery box in the basement into a written condition report:
Covered during a tune-up
- Heat exchanger inspection and combustion/CO safety check
- Refrigerant charge and coil condition, measured, not eyeballed
- Electrical health: capacitors, contactors, and motor amp draws against nameplate
- Airflow and duct assessment for the comfort complaints you'd otherwise discover in August
- An honest remaining-life read and written findings you can negotiate with
USA Savings Club members get these on a schedule, with priority service and a free membership for active military and veterans. Plan details →
Quick answers
Frequently asked
- Doesn't the general home inspection already cover the HVAC?
- Only barely. A general inspector confirms the system responds at the thermostat and looks for obvious hazards. They typically don't evaluate age against expected lifespan, measure refrigerant charge or amp draws, inspect the heat exchanger, or assess ductwork, the exact items that decide whether you're buying a five-figure replacement in the next few years.
- When should I schedule a professional HVAC evaluation on a house I'm buying?
- During your inspection contingency window if you can, findings become negotiating leverage while you still have it. If the timeline's too tight, the week you move in is the next best time: you'll know what you own before the first heat wave or cold snap tests it.
- The seller has no service records. How bad is that?
- It's common, and it's information: no records usually means no regular maintenance, which shortens equipment life and can void what's left of a manufacturer warranty. Weight the system's age toward the pessimistic end of its range, and get a professional condition read before you count on it.
After you close