How often should you have your HVAC professionally serviced?
Updated July 2026
Have your HVAC system professionally serviced twice a year: the air conditioner in spring, the furnace in fall. If you have a heat pump, it works both seasons, so it gets both visits. Each tune-up runs $80–200, booked in the shoulder seasons when calendars are open and rates are normal. The fall furnace visit carries the most weight: a combustion check is also a carbon-monoxide check, and most manufacturers require documented annual maintenance to keep the parts warranty alive. This is the professional layer on top of the filter changes you do yourself.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Gas furnace | Every fall | Combustion and heat-exchanger checks are safety items, not just efficiency |
| Central AC | Every spring | Refrigerant charge, coil condition, and capacitor health decided before the heat arrives |
| Heat pump (heats and cools) | Twice a year | It runs nearly year-round, double the runtime of either single-season unit |
| New system under warranty | Annually, documented | Most manufacturers condition the 10-year parts warranty on proof of maintenance |
| System 12+ years old | Twice a year, and budget ahead | Late-life systems fail at the season change; tune-ups become triage and forecasting |
| Boiler / hydronic heat | Every fall | Combustion, pressure, and circulator checks before the heating season |
The cost of skipping it
What skipping it costs: the quiet cost is efficiency drift: dirty coils, low charge, and weak capacitors each shave points, and the U.S. Department of Energy attributes meaningful energy waste to exactly this kind of neglected maintenance. The loud cost is timing: unserviced systems fail in the first heat wave or cold snap, at emergency rates. The math the tune-up buys: a $150–400 capacitor or contactor caught in April versus a $1,500–3,000 compressor in July; an $80–200 fall visit versus a $4,000–8,000 mid-January emergency furnace replacement. And a cracked heat exchanger is a CO hazard money doesn't measure. Skipped visits can also quietly void the parts warranty. The full failure math is in our cost of skipping HVAC maintenance deep dive.
How to do it (Two pro visits a year · $80–200 each · you just book them early)
- Book spring AC service in March–April and fall furnace service in September–October, before the first extreme week fills every calendar in town.
- Ask what the tune-up includes: coil inspection/cleaning, refrigerant charge check, capacitor and contactor testing, condensate drain clearing (AC); combustion analysis, heat-exchanger inspection, ignition and safety-control checks (furnace).
- Keep the invoice and findings; warranty claims want documented maintenance history (OnOtto stores documents with the recurring task).
- Between visits, do your part: filter changes on schedule, outdoor condenser kept clear of debris and vegetation by 2 feet, supply vents unblocked.
- When the tech quotes a repair on an aging system, apply the $5,000 rule of thumb: multiply repair cost by system age in years; over ~$5,000, put the money toward replacement instead.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing both tune-up bookings schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
Are annual HVAC maintenance plans worth it?
Run the math: plans typically cost $150–350/year and bundle the two tune-ups plus priority scheduling and a repair discount. If the plan price roughly equals what you'd pay for the two visits anyway, it's fine; the priority scheduling alone matters in a heat wave. It's not worth it if you'd never book the visits it replaces, and no plan substitutes for changing your own filters.
Can I skip the pro visit if I change filters religiously?
Filter discipline covers the biggest DIY lever, but it can't measure refrigerant charge, test a weakening capacitor, analyze combustion, or inspect a heat exchanger for cracks, the failure points that turn into emergencies and the safety items that matter. A young system in a mild climate can sometimes stretch to alternate years for the AC side; the gas-furnace safety check and any warranty-required maintenance shouldn't stretch.
What should a good tune-up actually include?
AC: clean/inspect coils, verify refrigerant charge, test capacitors and contactors, clear the condensate line, check amp draws and temperature split. Furnace: combustion analysis, heat-exchanger inspection, clean flame sensor and burners, test ignition, safety limits, and venting. A 15-minute "tune-up" that ends in a parts pitch is a sales call; ask for the checklist and readings in writing.
When is the cheapest time to book HVAC service?
The shoulder seasons (roughly March–April and September–October), when techs aren't running emergency calls. Some companies discount tune-ups then to fill calendars. The most expensive time is the first 95° week or the first hard freeze, which is exactly when a neglected system chooses to fail.