Fenton, MO · Maintenance

HVAC Maintenance - Fenton | A Plan that Protects Your System & Wallet

Your HVAC system needs maintenance to avoid surprise breakdowns and maximize its lifespan. That's why we offer an HVAC maintenance plan. You get better pricing plus some bonus discounts and services.

Call (314) 527-2722

Licensed & Insured
Emergency Service
Locally Owned
Satisfaction Guaranteed

Technician checking refrigerant pressures on an outdoor HVAC unit

We want to incentivize your maintenance. It really is that important! As a regional HVAC contractor in Fenton backed by 35 years of experience, we would rather earn your business by helping you maintain your equipment. That's because we are in the business to help people.

Patriot technician performing a seasonal HVAC tune-up in Fenton, MO

What Comes with Our HVAC Maintenance Plan

Two annual tuneups
15 percent off all repairs
10 percent off all installations
10 percent off all indoor air quality products
Priority service
Reduced professional service fee of $99 (normally $125)
$150 per year loyalty credit towards a furnace and AC system upgrade
Multi-year inflation-free pricing available
Water heater inspection

Call to sign up today: (314) 527-2722

Why You Need HVAC Maintenance

Preventive maintenance prepares your system for the coming season. Fenton gets real seasons. So Summers are hot with heavy humidity. Winters bring hard freezes and frigid wind chills. Those weather swings are tough on any HVAC system. This is why we recommend two annual visits.

Spring in the St. Louis area can change fast. Cool mornings give way to muggy afternoons. Your AC sat idle all winter and you don't know if the refrigerant level is good or if the coils are clean. A spring visit checks all that and more and gives you peace of mind.

Furnaces have their own needs. Just like the AC they sat unused for months before a cold snap forces you to switch from AC to heat, sometimes in the same day. A fall check can find a cracked heat exchanger or failing igniter while repairs are easier.

Some homeowners try to fit both checks into one visit. It doesn't work the same way. A spring check can't tell you much about how your furnace will hold up in December.

Maintenance Process

Our licensed technicians follow a specific maintenance checklist (opens in a new tab) that meets local building codes. Some tasks vary depending on the system and season.

Full system inspection. We start inside then move outside. We check capacitors, controls, drains, vent airflow, thermostat communication, pilot light, electrical systems and refrigerant pressures.
Lubrication and documentation. Your tech will lubricate all moving parts and document any worn parts or potential issues.
Filters. We also replace or clean filters, based on your system needs.
Coil cleaning. Your tech will remove dirt from evaporator and condenser coils.
Findings. After the inspection and cleaning, your tech will provide photos of worn components and let you know how soon they need to be replaced. We will never pressure you into a decision.

Coils and ductwork cleaned during a Patriot HVAC maintenance visit

Scheduling Maintenance for Fenton's Two-Season Climate

We recommend you book your AC check in early spring before the first heat wave. For your furnace or boiler check, it's best to get it checked at the beginning of fall starting in September because there's a 10 percent chance for freezing temps by Oct. 14. Getting on the schedule early gives you confidence that your system is ready for the season before it starts.

Why Homeowners Choose Us

In-House Training: Our technicians train at our facility in Fenton under a 35-year industry veteran. We never use your home as a learning opportunity.
Full-System Diagnostics: Every service call includes a complete system diagnostic to catch hidden problems before they cause a total breakdown.
Vetted Team: Every employee passes background checks and drug screenings.
Fast Response & Weekend Hours: We typically can get to you within 24 hours and offer weekend hours for emergencies.
Licensed Local Experts: Our work is code-compliant and fully insured, performed by technicians holding St. Louis County Journeyman (ML12523) and Mechanical (MSM02530) licenses. Not in St. Louis County? We have techs licensed for surrounding counties too.
Photo Documentation: We share photos of worn components and explain our findings clearly without high-pressure sales tactics.

Patriot Heating, Cooling & Air Quality

(314) 527-2722
Mon–Fri: 8:00am – 5:00pm
Emergency service available

Good to Know

Frequently Asked Questions

Common questions about HVAC Maintenance

You should book maintenance twice a year, once in spring and once in fall. Fenton has hot, humid summers and hard winter freezes, and each season puts different stress on your system. A spring visit gets your AC ready before the first heat wave. A fall visit checks your furnace before the first cold snap. Skipping one visit often means you find out about a problem during the worst week of the year, like a broken furnace on a freezing night.

You can expect a full check of your indoor and outdoor equipment, not just a quick look. We test your thermostat, clean the coils, check refrigerant levels, replace your filter, inspect ductwork, and check the condensate drain line. Every visit follows the same steps, even if your system seems fine. We explain anything we find before doing any extra work, so you always know what's happening in your own home.

Many Fenton homes built in the 80s and 90s have ductwork that wasn't sized for today's higher-efficiency systems. That mismatch is often the first sign homeowners notice, usually as one warm upstairs room while the rest of the house feels fine. Restricted airflow puts extra strain on your whole system over time. A maintenance visit checks your ducts and vents for gaps or blockages that may be causing the problem.

Yes, a filter change can solve a lot of common problems, especially weak airflow during humid Fenton summers. Hold your filter up to the light. If you can't see through it, swap it out. But if you've already changed the filter and things still feel off, that points to something deeper, like a refrigerant issue or a clogged drain line. Those problems need a full maintenance visit, not another filter.

A full maintenance visit takes longer than people expect because we work through your entire system, not just one part. Homes with a single furnace and AC unit finish faster than homes with several ductless units plus a central system, since each indoor unit needs its own inspection. We check coils, refrigerant, electrical connections, and the drain line before we're done, so nothing gets missed along the way.

What Our Customers Say

Real reviews from homeowners across Fenton and the St. Louis metro.

"An outstanding experience! They scheduled a visit and arrived promptly the very next day. The technician was incredibly friendly and knowledgeable, took the time to answer all my questions, and offered valuable suggestions for improving my heating and A/C system. Their professionalism earned my trust — highly recommend!"

Ronnie K. via Google

"I had the opportunity to speak with the company and got some great advice on my HVAC situation. Great experience — a lot of knowledge with this company. I would recommend them for all your needs."

Terry S. via Google