Heating, Cooling, Plumbing & Electrical in O’Fallon, IL

From the older homes near Main Street to the subdivisions off I-64, your neighbors at GRP|WEGMAN keep O’Fallon homes running.

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24/7 Service

Flat-Rate Pricing

Union-Trained Techs

Locally Owned

Your Neighbors in O'FAllon

O’Fallon has grown fast. The railroad still separates the older homes around historic Main Street from the subdivisions that filled in after the 1980s and the I-64 expansion. Those subdivisions include Thornbury Hill, Fairwood Hills, Nolin Creek Estates, and Deer Creek. A lot of those homes are still running the furnace, AC, and water heater the builder put in.

O’Fallon is five miles from Scott Air Force Base, so plenty of neighbors are new in town or getting ready to move. Whether you’ve been here 30 years or 30 days, GRP|WEGMAN brings union-trained techs, honest flat-rate pricing, and a phone that’s answered 24/7. We’ve been part of the Metro East for more than 70 years.

Home Services in O'FAllon

Heating, cooling, plumbing, and electrical, all from one local team.

GRP|WEGMAN technician testing the wiring inside a home furnace with a meter

Furnace & Boilers

Repairs, replacements, and fall tune-ups for forced air and boiler heat.

Heating Services

GRP|WEGMAN technician checking an outdoor AC unit with refrigerant gauges and a multimeter.

Air Conditioning

Fast AC repair and honest advice on when it’s time to replace.

Air Conditioning

Plumbing

Leaks, fixtures, and repairs done right the first time.

Plumbing

Water Heaters

Tank, tankless, and heat pump water heaters, repaired or replaced.

Water Heaters

GRP|WEGMAN technician carrying a tool bag up a home’s front walk, with a company service truck in the driveway

Drains & Sewer Lines

Clogged drains cleared and older sewer lines inspected.

Drain Cleaning

Wall-mounted EV charger plugged into an electric car in a home garage

Electrical

Panel upgrades, EV chargers, lighting, and repairs, with permits handled.

Electrical

What We See in O'Fallon Homes

O’Fallon’s homes tell the story of how the city grew.

Historic Downtown Homes

The streets around Main Street have O’Fallon’s oldest homes, some built more than 100 years ago. Many have older drain and sewer lines, aging wiring, and heating that’s been updated more than once. We take extra care in older homes.

Early Subdivisions

The neighborhoods built during O’Fallon’s 1980s growth are solid homes, but most are on their second furnace and AC by now. Original ductwork and water heaters are worth checking.

Growth-Boom Homes

After I-64 expanded in the 1990s, subdivisions went up quickly, often with builder-grade equipment. At 15 to 25 years old, those systems are near the end. Planning a replacement now beats a breakdown in July or January.

NEWER BUILDS

O’Fallon keeps building. Newer equipment runs efficiently when it gets regular care, and many manufacturer warranties expect yearly maintenance. The At Home Club handles both tune-ups.

Not sure what your home needs? Call 618-258-9000 or request service

How It Works

Simple, upfront, and no surprises.

At Home Club Members

pay no service call fees.

See the Club →

Call or Request Service

Call 618-258-9000 anytime, 24/7, or request service online. We'll find a time that works for you.

Get Your Price Up Front

Your technician finds the problem and gives you a flat-rate price before any work begins. No hourly guessing and no surprises at the end.

Problem Solved

We fix it right, clean up after ourselves, and make sure everything’s working before we leave

GRP|WEGMAN AT HOME CLUB

Your O’Fallon Home, Covered Every Season

The At Home Club keeps your heating and cooling running right, with two tune-ups a year, priority service, and no service call fees.

$198/year

No monthly fees

Join the At Home Club →

Spring & Fall Tune-Ups

Your AC checked before summer, your furnace before winter.

Priority Service

Members get priority scheduling, even during heat waves.

No Service Call Fees

Including nights, weekends, and holidays.

10-Year Labor Warranty

On new HVAC systems installed by GRP|WEGMAN.

What Our Neighbors Say

“

They were here the next day and had my air conditioner in and I had air that night.

“Our AC had went out... I called and they got it all set up and they were here the same day to evaluate the situation... It's so quiet you can't even hear it... fantastic guys, very courteous, very professional, explained everything about the whole unit. It was just a very fabulous experience with us.”

RHONDA Edwards

GOOGLE REVIEW

See our reviews on Google →

O'Fallon
Questions

Still have a question?
Call 618-258-9000, 24/7.

Do you serve all of O’Fallon?

Yes. We cover downtown and the Main Street area, Thornbury Hill, Fairwood Hills, Nolin Creek Estates, Deer Creek, Forest Hills, and the neighborhoods near Scott AFB. We also serve Shiloh, Belleville, and the rest of the Metro East.

My subdivision home still has its original furnace and AC. Is it time to replace?

It depends on age and condition. If your system is past 15 years and needs a major repair, replacing may be the better value. If it’s running well, a tune-up can keep it going. We’ll show you the numbers either way.

We just moved to O’Fallon. Can you check our home’s systems?

Not always. If they're running well, a tune-up may keep them going for years. If they're 15 or more years old and need a big repair, we'll walk you through the numbers and give you an honest answer.

Can you install an EV charger or upgrade my electrical panel?

Yes. Our union-trained electricians check whether your panel can handle the load, pull the permit, and handle the inspection.

How fast can you get to my home?

Call 618-258-9000 any time, day or night. We’ll give you a real arrival window, not a guess.

Request Service

Tell us what's going on and we'll call you back during business hours.
Need help now? Call 618-258-9000, 24/7.

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Heating, Cooling, Plumbing & Electrical in O’Fallon, IL

From the older homes near Main Street to the subdivisions off I-64, your neighbors at GRP|WEGMAN keep O’Fallon homes running.

Your Neighbors in O'FAllon