Most homeowners don't think about their HVAC system until something goes wrong. The problem? By the time a system fails, what could have been a minor repair often turns into a major one. Regular HVAC maintenance is one of the most cost-effective things you can do as a homeowner — and one of the most overlooked.
At Lanz Plumbing, Heating & Cooling, we've seen firsthand what neglect does to heating and cooling systems. This guide covers everything you need to know: why maintenance matters, what it includes, when to schedule it, and how to protect your investment for the long haul.
Why HVAC Maintenance Gets Neglected — And Why That's a Problem
Think about how the auto industry has conditioned drivers to change their oil regularly. Most people understand that skipping oil changes eventually destroys the engine. HVAC maintenance works the same way — but the industry hasn't done as good a job spreading that message.
When your furnace lives in the basement, and your AC unit sits outside, it's easy to forget they exist. You experience the comfort they provide every day, but you rarely see the equipment itself. That "out of sight, out of mind" mindset is exactly how systems deteriorate quietly over the years.
According to a U.S. Department of Energy review, 70–90% of AC and heat pump systems have at least one performance-compromising fault due to inadequate maintenance, and when duct leakage is included, that number climbs to 90–100%. Most of those failures were preventable with routine service.
HVAC Maintenance Starts With Your Air Filter
Airflow is the foundation of heating and cooling performance, and your air filter is the first line of defense. A clogged or incorrect filter doesn't just reduce air quality — it forces your system to work harder, accelerating wear on downstream components.
How Often Should You Change Your HVAC Filter?
For standard one-inch filters, the general recommendation is to change them every month. Thicker filters may last longer depending on manufacturer guidelines, but when in doubt, check it monthly.
One important caution: not all filters are created equal. Some high-efficiency filters marketed as allergen reducers are too dense for certain systems, restricting airflow and potentially damaging your equipment. If you're unsure which filter is right for your system, a licensed technician can check your system's air pressure and point you to the correct option.
Furnace Maintenance: What's Actually Happening Inside Your System
Your furnace works by pulling air across a heat exchanger, absorbing heat, and distributing that warm air throughout your home. When airflow is restricted — by a dirty filter or a buildup of debris — that process breaks down.
The Risk of a Cracked Heat Exchanger
Without adequate airflow, your heat exchanger overheats. Over time, this causes cracking — a serious issue that can allow carbon monoxide to enter your living space. It also leads to inefficient heating and, eventually, system failure.
Don't Forget the Blower Wheel
Even with good filtration, some dirt finds its way into the system. The blower wheel — which scoops air and moves it through the furnace — is a common collection point for buildup. A dirty blower wheel reduces airflow and efficiency, and it won't be visible unless a technician opens the unit up. Cleaning it is a standard part of a professional furnace tune-up.
AC Maintenance: Protecting Your Outdoor Unit
Your air conditioner's outdoor unit contains a coil that releases heat from inside your home. Because it's exposed to the elements, that coil is constantly collecting dirt, pollen, grass clippings, and other debris — and unlike your air filter, you can't see the buildup without opening the unit.
A clogged condenser coil reduces your system's cooling capacity, forces the compressor to work harder, and shortens the overall lifespan of the unit.
Leave Coil Cleaning to a Professional
It might be tempting to spray down the coil with a garden hose, but DIY cleaning can damage sensitive electrical components. A professional technician uses the right tools and techniques to clean the coil safely and effectively — and will flag any other issues while they're in there.
The Financial Case for Preventative Maintenance
Preventative HVAC maintenance is less about keeping things running and more about avoiding the cost of letting things fail. Here's how it pays off:
- Small parts get caught early. Components like capacitors — which help start and run your motors — weaken over time. Replacing a failing capacitor during a routine visit costs a fraction of what it costs to replace the motor it burns out.
- Emergency calls are expensive. A breakdown of the coldest night in January or the hottest day in July typically means premium pricing and longer wait times.
- Your warranty depends on it. Most HVAC manufacturers require documented annual maintenance to keep warranties valid. Skip a year, and you may be paying full price for a repair that would have been covered.
When to Schedule HVAC Maintenance
The standard recommendation is simple: air conditioner in the spring, furnace in the fall. Scheduling ahead of peak season means your system gets checked before it's under maximum demand — and you avoid the rush when every other homeowner is calling with an emergency.
That said, it's never the wrong time to schedule maintenance. A February furnace check-up is still worthwhile, and if a technician is already out for your heating system, it's a great opportunity to have them look at your AC as well.
Signs Your HVAC System Needs Attention Now
Don't wait for a complete breakdown. These are common early warning signs that your system needs service:
- The air filter hasn't been changed in several months
- Your home feels unusually humid or stuffy
- Rooms are heating or cooling unevenly
- The system is making new or unusual noises
- Energy bills have increased without an obvious explanation
- The system is cycling on and off more frequently than normal
Small symptoms can sometimes indicate bigger underlying issues. The sooner a technician takes a look, the more options you have.
The Lanz Comfort Family Maintenance Plan
At Lanz, we believe maintenance should be simple, consistent, and worth your money. That's why we created the Lanz Comfort Family — a membership program designed to take the guesswork out of HVAC and plumbing upkeep.
What's Included:
- Spring AC maintenance
- Fall heating maintenance
- Plumbing maintenance (water heater and fixtures)
- Reduced dispatch fees
- 15–25% off repairs, depending on plan level
- Priority scheduling — Orange level members receive guaranteed same-day service
Priority service is especially valuable during extreme weather. When temperatures drop and dozens of calls come in at once, Comfort Family members move to the front of the line.
We also handle filter delivery and replacement. We'll ship your filters for the year and change them during your scheduled visits — one less thing to remember.
Schedule HVAC Maintenance With Lanz Today
Whether you're overdue for a tune-up or you've never had your system professionally serviced, it's not too late to start. Regular HVAC maintenance protects your equipment, lowers your energy bills, preserves your warranty, and keeps your home comfortable year-round.
Call Lanz Plumbing, Heating & Cooling at 217-394-1380 or contact us online to schedule your maintenance visit or learn more about Comfort Family membership.
