How Often Should HVAC Maintenance Be Done?

If you’ve ever had your AC quit in the middle of a heatwave, you already understand why routine maintenance matters. It’s not just about comfort—it’s about preventing emergencies. At Allegiance Heating and Air, we see it all the time: a simple clogged filter turns into a burnt-out compressor. Or a small refrigerant leak, left unchecked, causes the whole system to shut down.

Many homeowners assume HVAC systems are "set it and forget it." But just like a car needs oil changes, your heating and cooling system needs regular tune-ups. Routine service doesn’t just keep your system running longer. It also makes it more energy-efficient, catches small problems before they get expensive, and ensures your family stays comfortable year-round.

So how often should you schedule maintenance? And what does a proper service plan look like? That’s what we’ll break down in this article.

How Often HVAC Systems Should Be Serviced

Twice a year. That’s the golden rule.

We recommend scheduling maintenance once in the spring for your air conditioning system, and once in the fall for your heating system. These pre-season checkups help catch problems before you actually need your system working at full capacity.

For San Diego homeowners, where temperatures can stay mild most of the year, it might be tempting to stretch the timeline. But even systems that aren’t running 24/7 collect dust, suffer from wear and tear, and drift out of calibration over time. Regular maintenance helps avoid system strain during those peak heat waves or cold snaps.

What about new systems? Some homeowners assume that a newer HVAC unit doesn’t need attention for a few years. But even brand-new systems require annual service to maintain manufacturer warranties. Skipping this can leave you unprotected if parts fail.

If your system is older (10+ years), you may benefit from seasonal checkups and periodic performance reviews, especially during heavy use months. Consistent service is the best way to extend its lifespan without risking efficiency or safety.

Seasonal Maintenance Guide

Here’s what you should expect from a professional seasonal HVAC checkup:

Spring (AC Service):

• Clean or replace air filters

• Inspect refrigerant levels and check for leaks

• Clean condenser coils and fan blades

• Test thermostat accuracy and recalibrate if needed

• Inspect ductwork and check airflow levels

• Check electrical connections and capacitors

Fall (Heating Service):

• Inspect and clean burners and heat exchangers

• Test carbon monoxide levels for safety

• Verify ignition systems are operating properly

• Check blower motor and belts

• Clean or replace air filters

• Evaluate overall system efficiency

In both cases, we test safety controls, lubricate moving parts, and identify anything that looks like it may become a problem in the near future. This comprehensive inspection keeps your HVAC system running smoothly no matter the season.

At Allegiance, our team follows a detailed checklist to make sure your system is fully prepared for the months ahead.

Signs You Need Immediate Service

Even with regular maintenance, unexpected issues can still come up. Here are a few signs that you shouldn’t wait for your next scheduled appointment:

• Unusual noises: Banging, squealing, or grinding may indicate internal damage.

• Uneven temperatures: Hot and cold spots in your home signal airflow or duct issues.

• Weak airflow: A sudden drop in air pressure could mean a failing motor or clogged duct.

• Frequent cycling: If your system turns on and off constantly, it’s working harder than it should.

• Musty or burnt smells: These could indicate mold in the ducts or electrical problems.

If you notice any of these symptoms, schedule a diagnostic visit. We offer free estimates, so you never have to second-guess whether it’s worth the call.

Many of our clients find peace of mind with our HVAC maintenance plans, which include seasonal visits, priority scheduling, and discounts on repairs. If you value comfort, safety, and long-term system health, a service plan is a smart investment.

Closing Thoughts: Maintenance Isn’t a Luxury—It’s a Lifeline

Homeowners who treat HVAC maintenance as an afterthought usually pay the price—literally. Whether it’s a repair that could have been avoided or skyrocketing energy bills due to clogged coils, neglect always costs more in the long run.

When you schedule regular HVAC service, you’re doing more than protecting your equipment. You’re making your home safer, more efficient, and more comfortable for the people inside it.

Need a spring or fall tune-up? Allegiance Heating and Air provides thorough, professional HVAC maintenance in San Diego—with no pressure and no fluff. Check our Specials Page for seasonal offers, and book your appointment today.