Commercial HVAC Maintenance in St. Louis, MO

Commercial HVAC maintenance is a schedule of visits that inspects, cleans and adjusts equipment before it fails. For offices, shops and small restaurants, it replaces surprise breakdowns with planned downtime. Kenan Corporation does not publish a named plan or a price list, so the useful question is what a good schedule should contain.

What does a commercial HVAC maintenance visit include?

A visit tests the parts that fail first and records what it found. The list below is a fair baseline for a rooftop unit or split system.

• Airflow: replace or clean filters, check belts, blower wheel and motor.
• Cooling circuit: clean the condenser coil, inspect the evaporator coil, clear the condensate drain, record refrigerant pressures.
• Electrical: inspect contactors, capacitors, wiring and connections for heat and wear.
• Heating: check the igniter, flame sensor, venting and burners on gas heat.
• Controls: test the thermostat, schedules and any economizer dampers.
• Findings: write down what was found, what was done and what to watch.

When should maintenance be scheduled?

Book one visit before cooling season and one before heating season. In St. Louis, that usually means spring and early fall, ahead of the first hard heat and the first hard freeze. Light commercial units that run long hours, such as a restaurant system, may need extra filter and coil attention in between.

Owners and staff can handle the monthly filter check themselves if the filters are easy to reach. A planned visit adds the parts that need tools and training.

What are the benefits of planned maintenance?

Planned maintenance lowers surprise failures and extends equipment life. The Department of Energy's FEMP guide reports that more than 55 percent of maintenance in the average facility is still reactive, and that preventive programs can save as much as 12 to 18 percent over reactive ones. Contractors citing ASHRAE service-life tables put rooftop units at about 15 years, and routine upkeep helps a unit reach and pass that mark.

Comfort has a rulebook too. OSHA has no specific temperature standard for offices, but it recommends 68 to 76°F and says employers must protect workers from temperature extremes. A unit that was checked in spring is less likely to fail during the first heat wave.

What are the signs a building is overdue?

Squealing at startup, longer run times to hold the same temperature, ice on a coil, water around the drain pan and the same fault returning each season all point to missed upkeep. So does a filter rack nobody remembers changing. St. Louis leans on cooling equipment: the National Weather Service logged 49 days at or above 90°F in 2025, so a unit running long hours needs its check before the first heat wave, not after.

What should a scheduled service agreement contain?

A written agreement should make every expectation visible before you sign it. Ask for these items, from any contractor.

1. Equipment list. Each unit by location, model and serial number.
2. Visits and timing. How many per year, in which months and in what hours.
3. Task list. The checks and cleanings done at each visit.
4. Response terms. What the agreement says about urgent calls, in plain words.
5. Billing. What is included and what is billed separately, such as parts or refrigerant.
6. Records. Who keeps the visit log and how you receive it.
7. Term and exit. The length, renewal and how to cancel.

We invite a call to discuss what this looks like for your buildings. Say how many units you have, their ages and who handles the lease.

What does commercial HVAC maintenance cost in St. Louis?

We publish no plan or price, and we found no reliable St. Louis figure for commercial maintenance, so none appears here. Angi's 2026 range for HVAC labor in St. Louis is $75 to $150 per hour, a market range and not our quote.

What moves the price of any agreement:

• The number, type and age of the units
• Visits per year, and the hours they must happen in
• Roof access, filter counts and sizes
• Grease-heavy or long-running kitchen equipment
• Whether parts and refrigerant are billed separately

Compare quotes line by line, and weigh them against the 12 to 18 percent savings the Department of Energy's FEMP guide cites for preventive programs over reactive ones.

What is not part of a maintenance visit?

A maintenance visit does not fix what it finds. It tells you. Know the exclusions up front.

• Repairs and parts. A failed capacitor, motor or compressor is quoted separately. Our commercial HVAC repair page explains how repairs are handled.
• Refrigerant work. Adding refrigerant without finding a leak is not a fix.
• Roof and structure. Leaks, curb damage and membrane repairs belong to a roofer.
• Duct cleaning. EPA does not recommend routine duct cleaning, only in cases of visible mold, vermin or heavy debris.
• Replacement. If a unit is near its end of life, rooftop unit service covers replacement planning.

Do maintenance visits need a permit or a license?

Routine upkeep is not permit work, but what it finds can be. St. Louis County treats ordinary maintenance such as filter changes and refrigerant recharges as exempt, yet requires a permit to install, alter, repair or replace a system, done by a contractor licensed for mechanical work. Commercial rules vary by city: Maryland Heights sends commercial mechanical permits to the county, and Florissant requires an occupancy permit before a business moves in.

Missouri has no statewide HVAC license. Whoever you hire, including us, should name the license your address calls for. Have the agreement say who pulls a permit if a visit turns into a replacement.

Why Kenan Corporation for planned commercial upkeep

We do not claim a plan, a certification or a price here. What we offer is a way of working that customers describe on Google, where we hold a 4.6★ rating from 29 reviews as of October 2026.

• Plain-language findings. Candice F. wrote that the technician is great at explaining things and giving you options.
• Repair-first honesty. The company was founded in 2010 to bring fairness and trust back to a trade that leans on hard-sell pitches.
• Open 24 hours. You can report a failure at any time, with same-day service when the schedule allows.
• A clear, upfront quote. Anything outside the visit is quoted before work starts.

We reach Maryland Heights, Hazelwood and Bridgeton from our base near Spanish Lake. Call (321) 478-0693 to plan a schedule, or read the preventive maintenance checklist for property managers.

Where planned visits fit the buildings

• Maryland Heights: about 36 percent of units sit in buildings of five or more, so tell us who controls access.
• Hazelwood: a failed contactor or clogged coil on a flat roof can shut down a workspace by midday, which a pre-season check targets.
• Bridgeton: name the equipment type when you call, since a rooftop unit and a split system need different tools.
• Clayton: with 65 percent of units in multi-unit buildings, managers juggle many air handlers and condensers on one schedule.
• Shrewsbury: about 750 units sit in buildings of 20 or more apartments, so one visit can cover condensers, filters and condensate lines.
• Maplewood: about 1,160 units sit in buildings of 10 or more, so one failed unit can affect many households; tell us the unit count.
• Mehlville: about 3,000 units sit in buildings of 5 to 19 apartments, where managers can ask for scheduled condenser, filter and drain checks.
• Spanish Lake: owners and managers along Bellefontaine Road can call us directly about individual units, about 5 minutes from our base.