HVAC Company Serving Hazelwood, MO

Hazelwood's housing stock runs the full range, from 1950s ranches in established subdivisions off Howdershell Road to newer developments near Lindbergh Boulevard and McDonnell Boulevard. Whatever the property, Martin-Jetco Heating and Air Conditioning has been handling HVAC work in North St. Louis County since 1964, and our NATE-certified technicians assess the full system before recommending anything.

Martin-Jetco Heating and Air Conditioning provides:

• AC Repair
• Furnace Repair
• Heat Pump Services
• Ductless Mini-Splits
• Indoor Air Quality
• Emergency HVAC Service
• Commercial HVAC
• Ductwork Replacement and Assessment
• Same-Day Service
• Financing Available

Serving Hazelwood since 1964. Call (636) 205-1631 or contact us online to get clear pricing, honest options, and service from a NATE-certified technician.

Need HVAC Help Today?

• Same-Day Service
• 24/7 Emergency
• Financing Available
• Licensed, NATE-Certified Technicians
• 1,000+ Five-Star Reviews
• Family-Owned Since 1964

Hazelwood HVAC Quick Answers

• Do you repair all brands? Yes
• Emergency HVAC? 24/7
• Same-day service? Often available for morning calls
• Do you install heat pumps? Yes
• Do you replace ductwork? Yes
• Serving 63042? Yes
• Financing? Yes

Heating, Cooling & Air Quality Services in Hazelwood

Martin-Jetco Heating and Air Conditioning provides HVAC services in Hazelwood for homes and businesses, including heating repair, cooling repair, system replacement, maintenance, indoor air quality, and emergency service.

Services include:

• Air conditioning services. AC Repair, AC Installation, AC Replacement 
• Heating services. Furnace Repair, Furnace Installation, Furnace Replacement 
• Energy-efficient comfort options. Heat Pump Services and Ductless Mini-Splits 
• Indoor air quality services. Whole-home filtration, air scrubbers, humidifiers, dehumidifiers, and other indoor air quality upgrades 
• System care. HVAC Maintenance and Emergency HVAC Service 
• Specialty HVAC systems. Boilers and geothermal systems 
• Commercial HVAC. Heating and cooling repair, replacement, and maintenance for businesses 

Martin-Jetco Heating and Air Conditioning installs all major HVAC brands, including York, Goodman, Daikin, Carrier, and Trane. Financing is available for qualifying projects.

What an HVAC Replacement Will Cost You in Hazelwood

Most residential replacements fall into two categories:

• AC Replacement with evaporator coil: approximately $5,500 to $9,200
• Complete HVAC system (furnace and AC): approximately $8,450 to $22,990 or more

What moves a project within those ranges:

• Square footage and the tonnage the system needs to handle
• Ductwork condition, including whether resizing, sealing, or replacement is needed
• Standard versus high-efficiency variable-speed equipment
• Zoning systems for homes with finished lower levels or additions
• Electrical or code updates before installation can proceed
• Indoor air quality additions included in the project
• Equipment access in finished basements or tight mechanical spaces

For homeowners, these ranges are only a starting point. A home near the airport corridor, a ranch with older ductwork, and a two-story with a finished lower level can all price differently once the equipment, airflow, access, and installation needs are checked. Martin-Jetco Heating and Air Conditioning reviews those details during the visit, then gives you a replacement price tied to your home and the system that will actually serve it.

Should I Replace My Furnace & AC Together?

Often, yes. When both systems are aging, replacing them together means matched equipment, a single installation visit, and a fresh maintenance schedule starting at the same point. The efficiency and comfort benefits of a new furnace pair better with a new AC than with an aging one.

If one system is still relatively new and performing well, replacing only the failing unit is usually the right call. Our technicians assess both systems and lay out the practical and financial case for each approach before recommending anything.

If replacement is starting to look likely, call (636) 205-1631 to schedule an estimate and see which equipment options make sense for your home.

Is the Repair Worth It? A Guide to Common HVAC Repair Costs.

The right answer usually comes down to one comparison: what the repair costs against what a replacement would run. These ranges help frame that conversation before our technician confirms the specific diagnosis:

• 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

If your AC or furnace is acting up, call (636) 205-1631 to get the problem diagnosed and the repair cost confirmed before you decide what to do next.

Is My HVAC System Too Old?

Age alone is not the only answer, but it is a starting point. A well-maintained system can run beyond its rated lifespan. A poorly maintained one may fail before it does.

Signs the system may be at the end of its useful life:

• The furnace or AC is 15 to 20 years old or older
• Repair costs are climbing and occurring more frequently
• The system uses R-22 refrigerant, which is no longer produced and expensive to service
• Comfort problems persist despite repairs
• Energy bills keep rising with no other explanation

Signs the system may have more life left:

• It was replaced within the past 8 to 10 years
• It has been serviced consistently on a seasonal schedule
• Repair history is minimal and the current issue is isolated
• Comfort and energy use have been stable

Our technicians assess the actual system condition, not just the age, before recommending repair or replacement.

Why Are My Utility Bills Increasing?

Rising energy costs with no change in usage are one of the clearest signs that an HVAC system is losing efficiency. Common causes in Hazelwood homes include:

• Aging equipment that has to run longer to reach the thermostat setting
• Duct leakage sending conditioned air into unconditioned spaces instead of living areas
• A system that is short-cycling and never completing full, efficient heating or cooling cycles
• Refrigerant loss reducing cooling capacity and forcing longer runtimes
• A dirty heat exchanger, condenser coil, or evaporator coil reducing system efficiency

Our technicians check all of these during a diagnostic visit. In many cases, the efficiency loss traces back to the duct system rather than the equipment.

Why Original Ductwork Causes Problems in Hazelwood Homes

When our technicians work on Hazelwood homes, one thing comes up more than almost anything else: the ductwork. Most of the city's housing was built in the 1950s and 1960s, and those duct systems were sized for the furnaces of that era, smaller blowers, lower airflow, different equipment entirely. When a homeowner replaces an aging system with a modern high-efficiency unit, the new equipment goes into the same old ducts, and the comfort problems that were blamed on the furnace often come right back. The system is new. The distribution is not.

Here is what that looks like in practice:

• Undersized returns. Return air systems in 1950s and 1960s homes were often sized to the minimum required at the time. A new high-efficiency furnace or AC installed into an undersized return system cannot breathe properly. The blower works against higher static pressure, airflow drops at the registers, and both comfort and equipment life suffer.
• Leaky ducts. Decades of seasonal thermal cycling cause duct joints to separate, especially in attics, crawl spaces, and unconditioned wall cavities. Duct leakage can account for 20 to 30 percent of a system's conditioned air disappearing before it reaches living spaces. A new unit cannot make up for what the duct system loses.
• Poor balancing. Duct systems in Hazelwood ranch homes were typically sized to deliver roughly the same airflow to every register, without accounting for room size, solar exposure, ceiling height, or distance from the equipment. The result is a home where some rooms are always comfortable and others never are.
• Airflow testing. Before recommending any equipment, our technicians measure airflow at every register in the home. This tells us where the duct system is losing air, where returns are undersized, and whether the existing distribution can support new equipment or needs to be addressed first.
• Static pressure. We also test static pressure throughout the system. High static pressure is a sign the blower is fighting against the duct system, which shortens equipment life, reduces comfort, and increases energy costs regardless of how efficient the unit is on paper.

Should I Replace My Ductwork?

The ductwork should always be assessed before new equipment is sized. Here is how to think through the decision:

• Seal and rebalance first when the duct system has minor leaks, separated joints, or balancing issues that can be corrected without full replacement. This is often the most cost-effective path and can dramatically improve both comfort and efficiency.
• Modify or partially replace when specific runs are undersized, returns are inadequate, or a finished basement or addition needs to be properly connected to the system.
• Full replacement is warranted when the duct system is severely degraded, fundamentally incompatible with modern equipment, or when the extent of leakage and sizing problems makes targeted repairs impractical.

Our technicians measure airflow and assess static pressure before recommending any of these paths.

If you have replaced your HVAC system but still have comfort problems, the ductwork is likely the reason. Call (636) 205-1631 or schedule a visit.

What HVAC Issues Are Common in Hazelwood Ranch-Style Homes?

Ranch homes dominate Hazelwood's residential stock, and they produce a consistent set of HVAC complaints that our technicians hear on nearly every street in the city:

• Far bedrooms that stay too hot or too cold. Long horizontal duct runs lose supply air through gaps and undersized runs before reaching the far end of the house. One thermostat on the main level cannot capture what is happening in bedrooms at the opposite end of the floor plan.
• Uneven airflow throughout the home. When ductwork was never balanced and return air is inadequate, some rooms get too much supply air and others get too little. Adjusting the thermostat does not fix the distribution problem.
• Finished basements that are never comfortable. Ranch homes across Hazelwood had basements finished long after original construction. The lower level relies on whatever conditioned air drifts down from the main floor. That is not enough. Our technicians evaluate whether a duct extension, a zoning adjustment, or a ductless mini-split resolves the problem.
• Second replacement system installed into original ductwork. Many Hazelwood homeowners have replaced their furnace or AC once already. The equipment changed; the ductwork did not. The same comfort problems that existed before the replacement often return, and the new equipment underperforms against its rated efficiency for the same reasons the old one did.
• Return air problems causing equipment strain. Without adequate return air, the system works harder than it should. Blower motors wear faster, filters clog more quickly, and the heat exchanger runs hotter. All of this shortens equipment life.

Call (636) 205-1631 or schedule a diagnostic visit if any of these describe your home.

Commercial HVAC Near Lambert Airport

Hazelwood's location adjacent to Lambert International Airport and its facilities creates one of the highest concentrations of commercial HVAC demand in North St. Louis County. Martin-Jetco Heating and Air Conditioning handles commercial HVAC for the full range of properties in this corridor:

• Warehouses and distribution centers along Missouri Bottom Road and the I-270 interchange
• Manufacturing and industrial facilities near the Boeing campus and Aviator Business Park
• Office buildings throughout the McDonnell Boulevard and Lindbergh Boulevard commercial districts
• Airport support businesses and operations facilities near Lambert
• Retail and restaurant tenants along St. Charles Rock Road and Natural Bridge Road
• Medical offices near SSM DePaul Health Center on McKelvey Road

Commercial systems in this corridor operate under different load profiles and uptime demands than residential equipment. A distribution center without climate control in summer or a medical office without heat in January cannot wait for a standard service window. Our team dispatches for commercial calls with the same urgency as residential emergencies. Call (636) 205-1631 or contact us online.

Who Shows Up at Your Door

Martin-Jetco Heating and Air Conditioning has been in business since 1964 and is still family-owned. Every technician carries NATE certification, the trade's leading independent credential. The company installs York, Goodman, Daikin, Carrier, and Trane, so the recommendation is based on what the home needs, not a required product line.

Our record is easy to check before you call:

• More than 1,000 five-star Google reviews from homeowners across the region
• A+ rating with the Better Business Bureau
• Six Angie's List Super Service Awards, based on verified customer feedback
• York Dealer of the Year, multiple times
• Read reviews from happy customers before you schedule

Reducing What Replacement Costs Out of Pocket

A replacement that lands unexpectedly is a real budget disruption, and a few programs help close the gap between the estimate and what you actually spend. Our technicians review all of them during the in-home evaluation:

1. Financing for qualifying projects. For most homeowners facing an unplanned replacement, converting the total into a fixed monthly payment is the most practical path forward.
2. Spire utility rebates on eligible higher-efficiency equipment. Our team files these on your behalf at installation. No separate paperwork for you to track.
3. Federal energy-efficiency tax credits on qualifying heat pumps and high-efficiency furnaces. The amount depends on the specific equipment and the tax year. A tax professional can confirm how it applies to your situation.
4. Seasonal promotions that vary throughout the year. Ask about what’s available you call (636) 205-1631.

Protect Your HVAC System Before It Fails

A pre-season inspection in Hazelwood does more than check a maintenance box. In a home where original ductwork may have never been assessed and the equipment has been through more than one replacement cycle, a spring check before cooling season and a fall check before heating season give our technicians a real opportunity to catch developing problems while they are still manageable.

The Martin-Jetco Heating and Air Conditioning Home Comfort Agreement makes that inspection routine rather than reactive. Members receive:

• Pre-season visits before cooling and heating demand arrives each year
• Complete safety and performance inspection at each visit, with developing issues identified and explained
• 20% off parts and labor on any repair work between scheduled visits
• No premium for after-hours or weekend calls
• Priority scheduling when an unplanned service call comes up
• Reduced diagnostic fee on calls during regular business hours

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

Neighborhoods & Areas We Serve

Martin-Jetco Heating and Air Conditioning serves homeowners and businesses throughout Hazelwood, including the 63042 zip code and neighboring North St. Louis County communities. Service is available along major local corridors such as Howdershell Road, Dunn Road, Lindbergh Boulevard, James S. McDonnell Boulevard, Taylor Road, Utz Lane, and Missouri Bottom Road.

The team also serves homes and businesses near Howdershell Park, Harry S. Truman Park, White Birch Park and White Birch Bay, Brookes Park, Prairie Commons Branch Library, the Hazelwood Community Center, and the Hazelwood Sports Complex.

Families connected to Hazelwood School District schools can reach Martin-Jetco Heating and Air Conditioning for HVAC service throughout the area, including homes near Hazelwood West High School, Hazelwood West Middle School, Armstrong Elementary, Garrett Elementary, McNair Elementary, and Russell Elementary.

Frequently Asked Questions

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

Martin-Jetco Heating and Air Conditioning serves all of Hazelwood and the 63042 zip code, along with neighboring North St. Louis County communities.

My home was built in the 1960s. Where does a replacement project start?

Our evaluation starts with the ductwork, not the equipment. In a 1960s Hazelwood ranch, the duct system was sized for equipment standards that have changed substantially, and installing a modern system without addressing the distribution can limit performance significantly. Our technicians assess the ductwork alongside the equipment so the estimate reflects what the home actually needs, not just the unit swap.

The far bedrooms in my home are never as comfortable as the main areas. Can that be fixed without replacing the system?

Often, yes. In ranch homes with long duct runs, temperature gaps between the near and far rooms are typically a distribution problem. Our technicians measure airflow at each register, check for duct leaks or undersized runs, and determine whether a duct correction, a zoning adjustment, or some combination resolves it before recommending a full replacement.

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

Two categories cover most residential replacements:

• AC with evaporator coil: approximately $5,500 to $9,200
• Complete system (furnace and AC): approximately $8,450 to $22,990 or more

Ductwork condition, home size, equipment type, and installation access all affect where a specific project lands. Call (636) 205-1631 or request an estimate online.

How much does AC repair typically cost in Hazelwood?

Repair costs by component:

• Minor repairs (capacitors, thermostats): $150 to $600
• Mid-range repairs (blower motors, evaporator coils): $500 to $2,000
• Major failures (compressor-related, control boards, heat exchangers): $700 to well over $1,000

Our technician confirms the exact cost after diagnosing the failure, then compares it against AC replacement before recommending a direction.

How much does furnace repair typically cost in Hazelwood?

Common repair ranges:

• Ignitor and flame sensor: $180 to $350
• Furnace capacitor: $150 to $350
• Blower motor: $500 to $1,400+
• Control board: $700 to $1,650
• Heat exchanger: $2,000 to $4,000

At the control board and heat exchanger level, our technicians compare repair against furnace replacement before recommending either path.

My finished basement is always uncomfortable no matter what the thermostat says. What is going on?

In ranch homes where basements were finished after original construction, the lower level was rarely connected to the home's duct plan. It runs off whatever conditioned air finds its way down from the main floor, which is not designed airflow. Our technicians evaluate whether a duct extension, a zoning system, or a dedicated ductless mini-split for the lower level is the right fix for your specific layout.

My AC runs but certain rooms never cool down. What should our technicians check?

In Hazelwood's older ranch homes, uneven cooling is almost always a duct problem rather than a failing system. Long horizontal runs that were never sealed or properly sized lose supply air before it reaches the far rooms. Our technicians check refrigerant charge, measure airflow at each register, and inspect the duct system before confirming whether the fix is an AC repair, a duct correction, or something else.

My furnace turns on but shuts off before the house warms up. What does that mean?

A furnace that starts and stops short of completing a full heating cycle is almost always responding to a safety shutdown. A clogged filter restricts enough airflow to overheat the heat exchanger, which trips the limit switch and shuts the burners down while the fan keeps running. Replacing the filter and letting the system cool resolves it if that is the only cause. If the short-cycling continues, the limit switch itself may be failing, the heat exchanger may have developed a crack, or a control board fault may be interrupting the cycle. A cracked heat exchanger is a safety issue, so call (636) 205-1631 if a filter change does not solve it.

Are heat pumps a practical choice for Hazelwood ranch homes?

For a home with usable ductwork, a heat pump is worth evaluating directly against a traditional furnace and AC. For homes where the ductwork has distribution problems that were never corrected, our evaluation addresses those first, since they affect performance regardless of what equipment is installed.

How often does an HVAC system in Hazelwood need to be serviced?

Before cooling season and before heating season is the right cadence. In Hazelwood, where a meaningful share of the housing stock has original or early replacement ductwork and equipment through multiple service cycles, pre-season inspections give our technicians the best chance to catch problems before they turn into failures during peak demand. Documented HVAC maintenance also keeps most manufacturer warranties valid.

Is financing available?

Yes. Financing is available for qualifying projects. Our evaluation also covers applicable Spire rebates, federal energy-efficiency tax credits, and any current seasonal promotions, so you have the full cost picture before deciding.

Schedule HVAC Service in Hazelwood

Whether a system is showing its age, a comfort problem has never been properly diagnosed, or something needs attention today, Martin-Jetco Heating and Air Conditioning can help. Call (636) 205-1631 or schedule your evaluation online.