How often should you service your HVAC?

Once a year for each system. If your home has central air conditioning and a furnace, that means two professional visits: the cooling side in spring, before the first heat wave, and the heating side in fall, before the first cold night. If you have a heat pump doing both jobs, it works hard year round and deserves both visits.

Between those visits, the filter is your responsibility, and it needs attention far more often, typically every one to three months depending on the filter type and the household. That is a separate habit with its own logic, and we cover it in our guide to changing HVAC filters. This post is about the professional visit: what it includes, what skipping it costs, and how to stop relying on memory.

Why once a year, and why those seasons?

Heating and cooling equipment drifts. Refrigerant charges fall slightly, burners collect dust, electrical connections loosen a fraction, drain lines grow things you would rather not think about. None of it announces itself. The system just works a little harder each month to produce the same comfort, and you pay for the difference on every utility bill.

An annual visit catches that drift while it is still adjustment-sized rather than repair-sized. The timing matters for a practical reason too: spring and fall are the shoulder seasons, when technicians have open calendars and you are not waiting behind forty emergency calls. Book the air conditioner tune-up in a week when you do not need the air conditioner.

What does a professional tune-up actually include?

A real tune-up is inspection and adjustment, not a glance and a sticker. For the cooling system, expect the technician to check refrigerant levels, clean the condenser and evaporator coils, clear the condensate drain, test the capacitor and electrical connections, and verify the temperature drop across the system. For the furnace, expect a burner and heat exchanger inspection, a check of the ignition system and safety controls, and a combustion test.

Two things should always happen regardless of season: the technician measures something, and you receive a record of what was measured. If a visit produces no numbers and no paperwork, it was a sales call. Ask questions, and keep whatever documentation they leave. A dated service history is worth real money later, both for warranty claims and for showing a future buyer the system was cared for.

What happens if you skip a year?

Usually nothing, at first, which is exactly why skipping becomes a habit. The system keeps running. But three quiet costs accumulate underneath.

The first is efficiency. A drifting system consumes more energy to do the same work, month after month. The second is lifespan. Furnaces typically last roughly 15 to 20 years, and where a given furnace lands in that range depends heavily on climate, usage, and how it was maintained. Neglect tends to spend those years faster. The third is warranty risk: many manufacturer warranties expect proof of regular professional maintenance, and a claim can stumble without it.

There is also the matter of timing. Unserviced systems do not fail on a mild Tuesday in October. They fail on the hottest week of the year, under maximum load, when every HVAC company in town is booked solid. A tune-up is partly a payment to avoid ever making that phone call. And when a technician does eventually find a serious problem in an aging furnace, a documented service history makes the repair-or-replace decision far clearer, a decision we walk through in our furnace repair or replace framework.

Is a service contract or maintenance plan worth it?

Sometimes. Most HVAC companies sell an annual plan that bundles the two seasonal visits, priority scheduling, and a discount on repairs. Whether it makes sense depends less on the math and more on your behavior. If you would reliably book two visits a year on your own, paying per visit is usually fine. If you know yourself well enough to admit the fall visit would quietly not happen, the plan is buying follow-through, and follow-through is the entire game in home maintenance.

Read the plan before signing. The good ones commit to the full tune-up checklist above. The thin ones commit to a filter change and a look around, which you could do yourself.

How do you make it automatic?

The failure mode here is never ignorance. Everyone knows HVAC service is a good idea. The failure mode is that April and October arrive with no trigger attached, and the thought simply never surfaces. Whatever system you use has to do the remembering for you.

The simplest version is two recurring calendar events with the company's phone number in the notes. A stronger version ties the reminder to the house itself, alongside the record of every past visit, so you can see when the system was last touched and what the technician found. That is the approach behind maintenance in Holm: the house keeps its own schedule and taps you on the shoulder at the right moment, instead of the schedule living in your head. For the broader picture of what the rest of the year should look like, our month by month maintenance schedule lays out the full rhythm.

However you build the trigger, build it once and let it run. Two visits a year, a filter habit in between, and a record of what was done: that is the entire discipline.

A well-kept system hums along in the background of a well-kept house, unremarkable in the best possible way. If you want the remembering handled, the records kept, and the whole rhythm running without you carrying it, Holm was built for exactly that kind of quiet.