At least once a year. Ideally twice — once in the spring for the AC and once in the fall for the furnace. That's the consensus from ENERGY STAR, most manufacturers, and most working HVAC technicians. The exact cadence depends on your system type, your climate, and what your warranty requires.
Different systems get different schedules. Here's the cleanest way to decide:
| Your system | How often | When |
|---|---|---|
| Separate AC + gas/oil furnace | Twice a year | Late Feb–Mar (AC) and late Aug–Sep (furnace) |
| Heat pump (heating and cooling) | Once a year | Spring is typical; either shoulder season works |
| Mini-split (ductless) | Once a year | Spring; clean filters monthly between visits |
| Boiler + window AC units | Boiler annually, AC self-clean | Boiler: late summer. Window units: when reinstalling. |
| Old system (15+ years old) | Twice a year, regardless | Catch failure modes before they strand you |
A national recommendation is a starting point, not a finish line. The actual run-time of your system is what determines wear, and that varies by where you live.
Florida, Texas, the Gulf Coast, Phoenix. The AC runs 8–9 months a year. Twice-a-year service is the minimum, and aggressive coil cleaning matters most.
Most of the U.S. — meaningful heating and cooling demand. Twice-a-year service is the standard recommendation, with the visits split spring and fall.
Coastal California, Pacific Northwest. Light HVAC use year-round. Once a year is generally adequate, with self-maintenance (filters, clearing the condenser) in between.
This view shows up regularly on r/HVAC and a few contractor blogs. The argument: routine annual visits don't prevent the majority of failures, and most of what a tech does in 15 minutes is cosmetic — checking pressures, looking at the capacitor, glancing at the coil. Doing the basic stuff yourself (filter changes, keeping the condenser clear, washing the outdoor coil with a hose every spring) covers most of the value.
It isn't a fringe opinion. But it has trade-offs:
The contrarian advice is reasonable for someone who is already mechanically inclined, plans to stay in the home for the system's full life, and is willing to absorb the warranty risk. For most homeowners, annual professional service plus monthly filter changes is the right balance.
Don't confuse filter changes with system service. A new filter every 1–3 months is what keeps airflow strong and the indoor coil clean between visits. It's the single highest-impact thing you do as a homeowner, and it gets skipped almost as often as the professional service itself.
For a tighter dive into what the technician actually does at each professional visit, see the HVAC maintenance checklist. For the case-by-case stakes of skipping years, see what happens if you skip HVAC maintenance.
Twice a year, six months apart, when you're not thinking about heating or cooling at all — that's the hard part. A reminder set once for late February and once for late August handles it for as long as you live in the house.
See the parent guide on HVAC service reminders for the full setup, or set the reminder right now:
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At least once a year, and ideally twice — once in the spring before cooling season and once in the fall before heating season. The twice-a-year cadence is recommended by ENERGY STAR and most major manufacturers, and it's the only schedule that catches problems before either season starts.
Yes. Annual professional service is the minimum required by most manufacturer warranties, including Carrier, Trane, Lennox, and Goodman. Skipping a year usually doesn't cause an immediate failure, but it can void warranty coverage and starts the slow degradation that ends in a major repair years sooner.
For separate furnace and AC systems, yes — different components, different failure modes, different testing windows. For a single heat pump that handles both heating and cooling, once a year is sufficient because the same equipment is inspected either way. If your home has central air plus a gas furnace, plan for two visits.
Yes. In hot, humid climates (Florida, Texas, the Gulf Coast), the AC runs eight or nine months a year and needs more frequent attention — twice a year is the floor, not the ceiling. In mild climates with light heating and cooling demand, once a year is generally fine. Cold-climate furnaces working hard all winter benefit from a fall pre-season check regardless.
It's a real opinion held by some technicians, and it's not crazy if you handle the basics yourself: monthly filter changes, keeping the outdoor condenser clear, listening for unusual noises. But the trade-off is real — you give up early detection of refrigerant leaks, weak capacitors, and cracked heat exchangers, and you almost certainly forfeit warranty coverage.
Every 1–3 months for standard 1-inch filters, every 6–12 months for high-efficiency 4–5-inch media filters. Filter changes are not a substitute for professional service; they're a baseline you do between visits. Pets, allergies, or new construction nearby push the frequency to the shorter end.
Late February to early March for the spring AC tune-up, late August to early September for the fall furnace tune-up. Booking before the season hits means contractor availability is wide open and rates are normal. Wait until the first hot week or first cold snap and expect a 2–4 week wait at peak rates.
Free email reminders for your spring and fall tune-ups. No account, no app, follow-ups until you mark each one done.
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