HVAC Company Serving Clayton, MO

Clayton packs a wide range of homes and buildings into just 2.5 square miles, from pre-war brick walkups in DeMun and mid-century ranch homes in Davis Place to Wydown Boulevard estates and high-rise condos near Carondelet Plaza. That range makes HVAC work here highly specific. A steam radiator conversion, condo fan coil replacement, and ranch home system upgrade all call for different planning. Getting it right starts with looking at your property.

Martin-Jetco Heating and Air Conditioning has served the St. Louis area since 1964, family-owned and operated, with licensed, NATE-certified technicians who have worked across the full range of what Clayton’s housing stock presents. 

If your HVAC system is not working the way it should, call (636) 205-1631 or reach out online to schedule service.

HVAC Service for Clayton’s Mix of Homes, Condos, & Commercial Buildings

Martin-Jetco Heating and Air Conditioning helps homeowners, condo owners, property managers, and business owners with heating, cooling, comfort, and specialty systems across the city.

• For central heating and cooling systems: AC repair, AC installation, AC replacement, furnace repair, furnace installation, furnace replacement, and heat pump services 
• For homes or units with limited ductwork:Ductless mini-splits, air balancing, thermostat installation, and thermostat repair 
• For indoor air quality: Filtration upgrades, air scrubbers, whole-home humidifiers, whole-home dehumidifiers, and other indoor air quality solutions 
• For older or more complex systems: Boilers, geothermal systems, and specialty HVAC work that requires more than a standard service call 
• For ongoing upkeep: HVAC maintenance, pre-season tune-ups, and system inspections before peak heating or cooling demand 
• For urgent problems: Emergency HVAC service when your AC, furnace, or heat pump cannot wait 
• For local businesses and institutions: Commercial heating and air conditioning service for offices, retail spaces, medical buildings, schools, and other businesses

Financing is available for qualifying projects. Equipment options include York, Goodman, Daikin, Carrier, and Trane, so repair and replacement recommendations can be shaped around the property instead of one product line.

What HVAC Replacement Costs in Clayton

The price of a replacement in Clayton depends significantly on the type of property. Two ranges cover most residential and condo projects:

• Air Conditioner & Evaporator Coil Replacement: approximately $5,500 to $9,200
• Complete HVAC System Replacement: approximately $8,450 to $22,990+

What tends to push a project toward the higher end:

• Pre-war or mid-century construction where access is limited and ductwork runs through finished spaces
• Condo buildings with shared infrastructure, mechanical room constraints, or HOA coordination requirements
• Larger single-family homes with additions, finished lower levels, or multiple zones to serve
• High-efficiency, variable-speed equipment selected for long-term energy performance
• Electrical or code updates required before modern equipment can be installed
• Indoor air quality work added to the project scope

For Clayton homeowners, an AC replacement with evaporator coil typically runs approximately $5,500 to $9,200, while a complete HVAC system replacement falls in the $8,450 to $22,990 range or higher. 

A pre-war home in Wydown-Forsyth and a 1970s condo on Carondelet Plaza may share a zip code, but the work can look very different. Call (636) 205-1631 to schedule an in-home HVAC evaluation and get a replacement estimate based on your actual property.

The Cost of Common HVAC Repairs

Once Martin-Jetco Heating and Air Conditioning diagnoses the problem, you get the repair cost and enough context to compare it against the age, condition, and remaining life of the system. These are common HVAC repair ranges homeowners may see:

• Capacitor ($150 to $450)
• Thermostat ($100 to $600)
• Ignitor replacement ($180 to $350)
• Flame sensor ($180 to $340)
• Furnace capacitor ($150 to $350)
• Blower motor ($500 to $1,400+)
• Evaporator coil ($600 to $2,000)
• Control board ($700 to $1,650)
• Heat exchanger ($2,000 to $4,000)
• Compressor-related failures (Well over $1,000)

When a single repair runs close to a third of what a new system would cost, replacement typically delivers better value over the next several years. Martin-Jetco Heating and Air Conditioning lays out both options with real numbers before recommending anything.

Call (636) 205-1631 to understand whether the fix is worth making or whether replacement deserves a closer look.

Neighborhoods & Areas We Serve in Clayton

Martin-Jetco Heating and Air Conditioning serves homeowners, condo owners, property managers, and businesses throughout Clayton, including the 63105 zip code and nearby St. Louis County communities. Service is available across Clayton neighborhoods and residential areas such as DeMun, Davis Place, Moorlands, Claverach Park, Wydown, Hillcrest, Old Town Clayton, and the downtown Clayton condo district.

The team also works near Shaw Park, the Forsyth Boulevard and Brentwood Boulevard area, the Clayton Road corridor, Maryland Avenue, Meramec Avenue, Carondelet Plaza, and the commercial and office buildings throughout downtown Clayton. Service is also available for businesses, institutions, and multi-unit properties near Forest Park Parkway, Big Bend Boulevard, Hanley Road, and Interstate 170.

Families connected to Glenridge Elementary, Meramec Elementary, R.M. Captain Elementary, Wydown Middle School, and Clayton High School can call Martin-Jetco Heating and Air Conditioning for HVAC service throughout the Clayton School District area.

When Heating or Cooling Fails, Call (636) 205-1631

Martin-Jetco Heating and Air Conditioning offers emergency HVAC service at any hour. How our urgent service calls typically unfolds:

• You contact us by phone or online, at any time
• A technician is dispatched, with same-day arrival common for morning calls
• The problem is diagnosed on site and explained before any work is authorized
• Most repairs are completed or fully scheduled within 24 to 48 hours of first contact

Need urgent HVAC help in Clayton? Call (636) 205-1631 now.

HVAC Challenges We Often See in Clayton Properties

Clayton’s homes and buildings are packed into a small area, but the HVAC needs can vary widely from one property to the next. Older homes, high-rise condos, brick walkups, renovated houses, and downtown commercial buildings each come with their own access, equipment, and comfort challenges.

Here are some of the situations Martin-Jetco Heating and Air Conditioning often encounters in Clayton:

• Older homes with radiator heat and no central air. Many homes in DeMun, Wydown-Forsyth, and Davis Place were built around steam or hot-water heat. Adding modern cooling may call for carefully routed ductwork or ductless mini-splits that avoid unnecessary disruption to original plaster, woodwork, and finished spaces. 
• High-rise condos with aging HVAC components. Buildings along Carondelet Plaza and the downtown Clayton corridor often have fan coil units, shared building systems, limited mechanical space, and access requirements that make replacement more involved than a standard residential job. 
• Brick walkups and pre-war flats. DeMun and parts of North Clayton include older brick apartment buildings where modern ductwork options can be limited by the original construction. These properties often need a more careful plan for airflow, access, and equipment placement. 
• Renovated historic homes with changed layouts. A home that has been opened up, expanded, or finished throughout may no longer match the system it was originally built around. Before recommending replacement, the load needs to be recalculated around the home as it exists now. 
• Humidity and comfort issues in older construction. Pre-war and early mid-century buildings can trap summer humidity or feel too dry in winter when the HVAC system is not sized, balanced, or maintained well. Indoor air quality upgrades, humidifiers, dehumidifiers, or better airflow may be part of the solution. 
• Commercial and institutional HVAC downtown. Clayton’s business district includes law offices, financial firms, medical practices, government buildings, schools, and other properties with larger or more complex HVAC demands. Martin-Jetco Heating and Air Conditioning handles commercial heating and cooling along with residential service throughout the city. 

Before you choose equipment or approve a major repair, call (636) 205-1631 to get an HVAC assessment based on the actual building, not a standard template.

Bringing the Cost Down

During the in-home evaluation, Martin-Jetco Heating and Air Conditioning reviews every available way to reduce the project total:

• Financing for qualifying projects, with monthly payment options at 0% interest
• Spire rebates filed on your behalf at the time of installation
• Federal energy-efficiency tax credits that may apply to heat pumps, high-efficiency furnaces, and qualifying AC systems
• Current seasonal offers when available

Want to see what savings may apply to your project? Call (636) 205-1631 or schedule your in-home evaluation online.

What You Can Expect from Martin-Jetco Heating and Air Conditioning

Martin-Jetco Heating and Air Conditioning has served the St. Louis area since 1964 and remains family-owned. Every technician is licensed and NATE-certified. We work with major HVAC brands, including York, Goodman, Daikin, Carrier, and Trane, giving you more than one option when it is time to repair or replace your system.

There is no pressure to decide before you are ready, and if anything needs attention after the job is done, the team returns and addresses it.

Proof You Can Look Up Before You Call

A major HVAC repair or replacement is easier to schedule when you can check the company first. Martin-Jetco Heating and Air Conditioning gives homeowners and property managers several ways to do that before booking service.

That includes:

• An A+ rating with the Better Business Bureau 
• Six Angie’s List Super Service Awards 
• Recognition as a York Dealer of the Year multiple times 
• More than 1,000 five-star Google reviews from St. Louis-area homeowners

Maintenance That Keeps Your HVAC System at Its Best

The Martin-Jetco Heating and Air Conditioning Home Comfort Agreement makes seasonal upkeep straightforward, with visits timed before each peak season and a set of membership benefits designed to reduce the cost and disruption of unplanned repairs:

• Pre-season visits scheduled before summer cooling demand and winter heating season begin
• A complete equipment inspection at each visit, catching developing issues before they become failures
• 20% off parts and labor on repair work between scheduled visits
• No premium for evening or weekend service calls
• Priority scheduling when an unplanned issue comes up
• A reduced diagnostic fee for calls during regular business hours
• Documentation satisfying most manufacturer warranty requirements

Ask about the Home Comfort Agreement when you call (636) 205-1631.

Frequently Asked Questions

What zip code does Martin-Jetco Heating and Air Conditioning serve in Clayton?

Martin-Jetco Heating and Air Conditioning serves all of Clayton, including the 63105 zip code, along with neighboring communities in St. Louis County.

Can you add air conditioning to a home that only has radiator heat?

Yes, and it is one of the more common requests in Clayton's pre-war neighborhoods. For homes without existing ductwork, ductless mini-splits are often the most practical solution, providing cooling and supplemental heating without requiring new ductwork through finished historic interiors. Where ductwork can be added without major disruption to original construction, a conventional central system may also be viable. The right choice depends on the building, the budget, and how the home is used.

Do you work in condo buildings and high-rises?

Yes. Martin-Jetco Heating and Air Conditioning handles HVAC service in Clayton's condo buildings, including fan coil units, individual system replacements, and new installations. Condo work involves coordination with building management, elevator access, and mechanical room limitations that freestanding homes do not present. Call (636) 205-1631 or contact us online to discuss what your unit needs.

How much does it cost to replace an HVAC system in Clayton?

An AC replacement with evaporator coil runs approximately $5,500 to $9,200. A complete system replacement runs approximately $8,450 to $22,990 or more. Property type, access conditions, ductwork situation, and equipment selected all affect the final number. Request an estimate online or call (636) 205-1631.

How much does AC repair typically cost in Clayton?

Capacitors run $150 to $450 and thermostats $100 to $600. Blower motors are $500 to $1,400 or more, evaporator coil problems $600 to $2,000, and compressor-related failures often exceed $1,000 by a meaningful margin. Martin-Jetco Heating and Air Conditioning presents the repair cost alongside a replacement comparison so you have both figures before making a decision. Call (636) 205-1631 to schedule an assessment.

How much does furnace repair typically cost in Clayton?

Ignitor replacement runs $180 to $350, flame sensor cleaning $180 to $340, and a furnace capacitor $150 to $350. Blower motors are $500 to $1,400 or more, control boards $700 to $1,650, and heat exchanger work $2,000 to $4,000. At the control board and heat exchanger range, furnace replacement is usually worth comparing directly. Call (636) 205-1631 for a furnace evaluation.

My AC is running but the house is not cooling down. What is happening?

The most common causes are a dirty filter, low refrigerant, a frozen evaporator coil, a failing capacitor, a fouled outdoor condenser, duct leaks, or a thermostat fault. In older Clayton homes where ductwork was never designed for modern equipment, air escaping before reaching the living spaces is frequently the real issue. In condo units, fan coil problems or shared system constraints can also be at play. A technician needs to check refrigerant, measure airflow, and inspect the coil before confirming any AC repair.

What causes a furnace to blow cold air instead of heat?

Usually a dirty filter blocking airflow, a thermostat set incorrectly, an ignition failure, a flame sensor that needs cleaning, a gas supply issue, a tripped limit switch, or a control board that has stopped functioning. The blower can keep running after the burners shut down, which is why air continues to come out but feels cold. Because gas and combustion components are involved, call (636) 205-1631 rather than repeatedly resetting the system. A technician will identify the source and confirm safe operation before leaving.

Are heat pumps a good fit for Clayton properties?

For many Clayton properties, yes. A heat pump can provide heating and cooling through one system, and newer models perform much better in Missouri winters than older heat pump designs did.

They can be especially worth considering for:

• High-rise condo units with limited mechanical space 
• Homes where adding ductwork would be difficult or disruptive 
• Properties moving away from radiator heat 
• Homes where the electrical setup can support the equipment 
• Owners looking for an efficient option for both heating and cooling 

Martin-Jetco Heating and Air Conditioning looks at the property before making a recommendation, including insulation, ductwork, mini-split options, energy use, and comfort goals.

How often should HVAC systems in older Clayton properties be serviced?

Twice a year is the baseline. In Clayton's pre-war and mid-century properties, where equipment types and ductwork conditions vary considerably, keeping to that HVAC maintenance schedule tends to catch problems earlier than in newer construction where system conditions are more predictable. 

Is financing available for HVAC replacement in Clayton?

Yes. Financing options are available for qualifying projects, and the team reviews applicable Spire rebates, federal energy-efficiency tax credits, and current seasonal offers during your evaluation so you see the complete picture before committing.

Get Clear Answers for Your Clayton Property

Whether you are adding cooling to a home that has never had it, comparing repair and replacement costs, managing a condo unit's system, or getting ahead of the next season, Martin-Jetco Heating and Air Conditioning can help you sort through the options and take the next step. Call (636) 205-1631 or schedule your in-home evaluation online today.