HVAC Company Serving Wentzville, MO

Wentzville was the fastest-growing school district in Missouri for two decades running. The homes came fast, the subdivisions filled in quickly, and the HVAC systems installed during that boom have been running hard ever since. A lot of them are now 12 to 15 years old, which is exactly where repair costs start climbing and replacement starts making more financial sense.

Martin-Jetco Heating and Air Conditioning has been working in St. Charles County since 1964, and the team knows what that generation of construction tends to need. Whether the system needs a repair, a tune-up, or a replacement, a licensed NATE-certified technician will give you a clear answer before any work starts.

Need help with heating, cooling, or comfort in your Wentzville home? Call (636) 205-1631 or message us online to schedule service with Martin-Jetco Heating and Air Conditioning.

HVAC Services for Wentzville Homes & Businesses

• AC Repair
• AC Installation
• AC Replacement
• Furnace Repair
• Furnace Installation
• Furnace Replacement
• Heat Pump Services
• Indoor Air Quality
• Ductless Mini-Splits
• HVAC Maintenance
• Emergency HVAC Service

Also available: boilers, geothermal systems, air scrubbers, whole-home humidifiers and dehumidifiers, air balancing, thermostat installation and repair, and commercial heating and air conditioning. Financing is available for larger projects.

What Does HVAC Replacement Cost in Wentzville?

Two ranges cover the majority of HVAC replacements in Wentzville:

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

Factors that affect HVAC replacement pricing:

• Home square footage
• System tonnage requirements
• SEER2 efficiency rating
• Single-stage vs variable-speed equipment
• Existing ductwork condition
• Zoning systems
• Electrical or code upgrades
• Indoor air quality add-ons
• Accessibility of installation area

Wentzville's newer construction tends toward larger floor plans and two-story layouts, both of which require accurate load calculations to size equipment correctly. Projects that involve ductwork corrections, zoning, or higher-efficiency variable-speed equipment tend toward the upper end of the range. An in-home evaluation is the only way to price the exact work your home calls for.

Several programs also help lower the out-of-pocket cost: flexible financing, utility rebates filed on your behalf, federal energy-efficiency tax credits on qualifying equipment, and seasonal coupons. We go through all of it during the evaluation so you see the full picture before committing.

Want to know where your project lands before booking an install? Request an estimate or call (636) 205-1631.

What Repairs Actually Cost: A Reference Guide

If you are weighing a repair quote against a replacement, here are the typical cost ranges for common HVAC repairs in the Wentzville area:

• 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 is pushing toward a third of what a new system costs, replacement usually pays for itself within a few years through lower bills and fewer service calls.

Is It Time to Repair or Replace?

Before getting into replacement costs, it helps to know where your system stands. A few markers make the repair-versus-replace decision clearer:

Signs repair still makes sense:

• The unit is under 10 years old with one isolated issue
• The repair cost is well below a third of what a new system would cost
• The system has otherwise been reliable and energy bills have stayed stable

Signs replacement is the smarter move:

• The unit is 12 to 15 years old or older
• It still uses R-22 refrigerant, which is no longer produced
• Repair calls are getting more frequent and each one costs more
• The home never quite reaches the set temperature on the hottest or coldest days
• Energy bills keep rising with no obvious explanation

If you are not sure which side of that line you are on, a diagnostic visit from one of our NATE-certified technicians will tell you definitively. Schedule one online or call (636) 205-1631.

HVAC Challenges Wentzville Homes Run Into

Wentzville's housing spans several decades, from older ranch and split-level homes near historic downtown to the two-story subdivisions that went up during the building boom of the 2000s and 2010s. The challenges differ by era, but they show up consistently across the city:

• Aging equipment in older homes. Homes near historic downtown Wentzville and along older neighborhoods often have systems and ductwork that were installed decades ago and have never been updated to match how the home is actually used today.
• Two-story floor plans with unbalanced ductwork. The upper level runs hot in summer, the main floor is comfortable, and the basement is something else entirely. That pattern usually points to ductwork that was never properly balanced for the floor plan, whether the home is five years old or thirty.
• Open layouts and high ceilings. Common in newer Wentzville subdivisions, these design features change how air moves through the home. A system sized for the original configuration may fall short as rooms get finished or layouts get opened up over the years.
• Humidity control. A system that short-cycles never runs long enough to pull moisture from the air, leaving the house cool on the thermostat but clammy in practice. Proper sizing addresses most of it; a whole-home dehumidifier handles what remains.
• Smart thermostat and zoning questions. A thermostat upgrade only helps as much as the ductwork and equipment allow. In homes where the underlying system is undersized or unbalanced, better controls are a partial fix at best.

Neighborhoods & Areas We Serve in Wentzville

Martin-Jetco Heating and Air Conditioning serves homeowners and businesses throughout Wentzville and the 63385 zip code, with crews working across the city’s established and growing communities.

Residential areas served include Stone Meadows, Carlton Glen Estates, the Villages of Stonegate, Stone Ridge Canyon, and homes around Great Oaks, Manors at Prairie Wind, Newport Meadow, Peine Lake Estates, and the Woodlands at Bear Creek area. The team also works near historic downtown Wentzville, SSM Health St. Joseph Hospital-Wentzville, and Bear Creek Golf Club.

Families connected to Wentzville School District schools such as Holt High School, Timberland High School, North Point High School, Wentzville South Middle School, Boone Trail Elementary, Stone Creek Elementary, Lakeview Elementary, Peine Ridge Elementary, and Flint Hill Elementary can call Martin-Jetco Heating and Air Conditioning for HVAC service in this part of St. Charles County.

The team serves homes and businesses along Wentzville Parkway, West Meyer Road, Pearce Boulevard, Interstate 70, Highway 61, Highway A, Hepperman Road, and North Point Prairie Road.

A Local Record You Can Check

Martin-Jetco Heating and Air Conditioning has served the St. Louis area for decades. The company has more than 1,000 five-star Google reviews, an A+ rating with the Better Business Bureau, 6 Angie’s List Super Service Awards, and repeated recognition as a York Dealer of the Year.

Those details matter, but the service call still comes down to the technician in your home. Every technician is licensed and NATE-certified, and the team installs York, Goodman, Daikin, Carrier, and Trane. That gives homeowners more than one equipment path to consider, with recommendations based on the home, the system, and the budget.

You will not get high-pressure sales tactics. You will get clear options, an explanation of what the technician found, and follow-up support if something needs attention after the job is done.

Same-Day & Emergency Service in Wentzville

When HVAC fails in July or January, waiting is not an option. Martin-Jetco Heating and Air Conditioning offers same-day and emergency service, including evenings, weekends, and holidays:

• Morning calls often mean same-day visits, sometimes with a technician at the door that afternoon or within the hour
• After-hours calls reach a real person, with service dispatched quickly
• A diagnosis and repair quote come on the same visit, so nothing stalls
• Most repairs resolved within 24 to 48 hours of the first call

Have an urgent heating or cooling issue that can’t wait until the next day? Call (636) 205-1631 today for emergency HVAC service.

Keep a New System at Its Best

The Martin-Jetco Heating and Air Conditioning Home Comfort Agreement makes seasonal maintenance automatic. Here is what membership includes:

• A complete safety and performance inspection at every visit
• Two tune-ups a year timed before peak demand, not after a breakdown
• 20% off parts and labor on any service repairs between visits
• No overtime charges, any time of day
• Priority scheduling so you are not waiting behind new customers
• A discounted diagnostic fee on office-hours service calls
• Documented HVAC maintenance records that satisfy most manufacturer warranty requirements

Frequently Asked Questions

What zip code do you serve in Wentzville?

Martin-Jetco Heating and Air Conditioning serves all of Wentzville, including the 63385 zip code, along with the surrounding St. Charles County communities.

How much does HVAC replacement cost in Wentzville?

An air conditioner and evaporator coil replacement typically runs approximately $5,500 to $9,200, while a complete system replacement runs approximately $8,450 to $22,990 or more. Home size, floor plan, ductwork condition, equipment type, and efficiency rating all determine where the project lands. Call (636) 205-1631 or request an estimate online for a number tied to your specific home.

How much does AC repair cost in Wentzville, MO?

Costs depend on the problem. Capacitors run $150 to $450, thermostats $100 to $600, and blower motors $500 to $1,400 or more. Evaporator coil problems run $600 to $2,000, and compressor-related failures can go well past $1,000. Martin-Jetco Heating and Air Conditioning gives you the repair cost up front so you can compare it against the cost of a new system before making a decision.

How much does furnace repair cost in Wentzville, MO?

Ignitor replacement typically runs $180 to $350, a flame sensor $180 to $340, and a furnace capacitor $150 to $350. Blower motors run $500 to $1,400 or more, control boards $700 to $1,650, and heat exchangers $2,000 to $4,000. When a repair gets into control board or heat exchanger territory, furnace replacement is often worth comparing. Call (636) 205-1631 and a technician will diagnose the issue and walk you through furnace repair options.

My Wentzville home is about 15 years old. Is the system ready to be replaced?

Possibly. Systems installed during the building boom of the early-to-mid 2000s are reaching or past the typical 12 to 15 year lifespan. Whether repair or replacement makes sense depends on the specific system, its repair history, and what a diagnostic visit turns up. Schedule an evaluation and we’ll help you figure out your next step!

Why is my AC running but not cooling my Wentzville home?

Common causes include a dirty filter, low refrigerant, a frozen evaporator coil, a failing capacitor, a dirty condenser coil, ductwork problems, thermostat issues, or an aging system that can no longer manage Missouri humidity. In Wentzville's newer two-story and open-plan homes, airflow and system sizing often play a role too. A technician should check refrigerant, measure airflow, inspect the coil and condenser, and tell you whether an AC repair solves it or whether something larger is going on.

Why is my furnace blowing cold air?

Cold air from a running furnace usually points to a dirty filter, thermostat issue, ignition or pilot problem, flame sensor failure, gas supply interruption, tripped limit switch, or a control board fault. The blower can keep running even when the burners are not firing, which is why the air feels cold. Because furnace problems involve gas and combustion components, call (636) 205-1631. Our NATE-certified technicians can inspect it, identify the cause, and confirm the system is safe before putting it back in service.

Are heat pumps effective during Missouri winters?

Yes, modern heat pumps handle Missouri's climate well, delivering both heating and cooling in one system. Newer models work in colder temperatures than older heat pump designs did. For some Wentzville homes, a dual-fuel setup or backup heat source is worth considering for the coldest stretches of winter. Martin-Jetco Heating and Air Conditioning evaluates insulation, ductwork, comfort goals, and energy use before recommending either direction.

How long does a new HVAC system last?

A properly sized, installed, and maintained system typically runs 12 to 15 years, and some hold up longer. Wentzville's humid summers and cold winters place steady demand on both air conditioners and furnaces. Two tune-ups a year, regular filter changes, clean coils, and prompt attention to early warning signs all help extend equipment life and keep most manufacturer warranties valid.

How long does installation take?

Most single-system replacements wrap up in one day. Projects involving ductwork corrections, zoning, or electrical updates may take longer, and Martin-Jetco Heating and Air Conditioning gives you a clear timeline during the evaluation. Contact us online or call (636) 205-1631 to get started.

Get Clear HVAC Recommendations for Your Wentzville Home

Whether you are comparing repair versus replacement, pricing a new system, dealing with an emergency breakdown, or planning ahead with maintenance, Martin-Jetco Heating and Air Conditioning can help. Call (636) 205-1631 or schedule an in-home evaluation online today.