What's on an HVAC maintenance checklist?
Updated August 2026
A whole-house HVAC system needs a filter every 30 to 90 days, two pro tune-ups a year (heating in fall, cooling in spring) at $80–200 each, plus a seasonal condensate-drain flush and a yearly rinse of the outdoor condenser coils. Those few tasks are what keep the whole thing running its 15 to 20 years. The U.S. Department of Energy puts the efficiency penalty from a clogged filter alone at 5 to 15%, so the cheapest task on the list pays for itself.
| Task | Interval | Effort |
|---|---|---|
| Check the air filter, change when dirty | 30–90 days | 2 min · DIY |
| Make sure supply and return vents stay open | Monthly | 5 min · DIY |
| Task | Interval | Effort |
|---|---|---|
| Flush the condensate drain line | Each season | 15 min · DIY |
| Set the thermostat for the coming season | Spring and fall | 5 min · DIY |
| Task | Interval | Effort |
|---|---|---|
| Hose the outdoor condenser coils clean | Yearly | 30 min · DIY |
| Book the cooling tune-up | Yearly | $80–200 pro |
| Task | Interval | Effort |
|---|---|---|
| Test-run the heat before the first freeze | Yearly | 10 min · DIY |
| Book the heating tune-up and safety check | Yearly | $80–200 pro |
| Task | Interval | Effort |
|---|---|---|
| Have the ducts inspected for leaks | Every 3–5 years | $100+ pro |
What neglect costs
Deferred HVAC service is death by a thousand cuts, then one big bill. The dirty-filter penalty the DOE cites, 5 to 15% on your energy use, is money leaking out every month. A frozen evaporator coil from starved airflow is a $200–600 call; a compressor killed by dirty condenser coils is $1,500–2,800. On the heating side, a cracked heat exchanger caught late is another $1,500 and up plus a CO risk. The full cost of skipping maintenance stacks up fast against two $150 tune-ups.
Leave these to a pro
Two visits a year is the standard: a spring cooling tune-up and a fall heating tune-up, $80–200 each or discounted on a yearly plan around $150 to $300. The tech checks refrigerant, combustion and venting, the heat exchanger, electrical, and the parts most likely to strand you. You own the filter, the vents, the condensate flush, and the coil rinse. To compare individual systems, the central-AC, furnace, and heat-pump checklists break each one down.
This whole checklist ships as reminders in OnOtto: every task above, on the right schedule for your home, snooze-proof.
Load this checklist as remindersFrequently asked questions
What does an HVAC tune-up actually include?
A cooling tune-up checks refrigerant charge, cleans and inspects the coils, tests the capacitor and contactor, and measures the temperature split across the evaporator. A heating tune-up inspects the heat exchanger, verifies gas pressure and safe venting, cleans the burners and flame sensor, and tests the ignition. Both confirm the thermostat and airflow. Expect 45 to 90 minutes on site and a written note of anything worn.
How often should I really change my HVAC filter?
Check it monthly and change a 1-inch filter every 30 to 60 days, or every 90 for a thick pleated media filter. Pets, allergies, and heavy runtime shorten that. The filter protects the blower and coil and drives that 5 to 15% efficiency swing, so it is the single highest-value task you do. A common mistake is buying the densest filter on the shelf; match the MERV rating your system is built for so you do not choke airflow.
Can I do HVAC maintenance myself?
Much of it, yes: filters, keeping vents clear, rinsing the outdoor coils, flushing the condensate line, and a seasonal test-run are all DIY. What you should not touch is the sealed refrigerant circuit, the gas valve and burners, and the heat exchanger, which need EPA and safety credentials plus gauges. A good split is DIY the airflow and cleaning side, hire out the combustion and refrigerant side twice a year.
When should the whole HVAC system be replaced?
Most systems run 15 to 20 years. Start planning replacement past 15, on old R-22 refrigerant, or when a repair tops about half the price of a new system. Rising bills, uneven temperatures, and frequent service calls are the soft signals. Replacing the AC and furnace together often costs less than doing them a year apart, since they share the coil, air handler, and labor.