Service is in our blood

“Ernst” is German for “earnest”, which means sincere and intense conviction.
It also means:

• Urgency – we respond fast when you have a breakdown
• Diligence- we take the time to get the job done right.

Schedule Service
heating services in Greenville, IL

Services

Let Ernst Take
Care Of You

Learn More >>

Financing

HVAC Financing

Learn More >>

heating installation in Greenville | Heating Repair in Illinois

Specials

Monthly Heating &
Cooling Specials

Learn More >>

State-of-the-Art Service. Old-Fashioned Care.

For more than 70 years, families have trusted Ernst Heating & Cooling to keep their homes comfortable. Al Ernst – farm kid, fixer, and all-around problem-solver – opened a small hardware and appliance shop in Hamel, Illinois in 1951.

He built the company the same way he built everything else: with his hands, his grit, and a promise to treat every customer like a neighbor.

Today, that spirit is still alive in everything we do. Ernst remains family-owned, locally grounded, and committed to honest work—just like Al intended. But we’ve also embraced the latest and best technology to make your experience faster, smarter, and more precise.

Contact us online or call 618.217.1836 for AC repair, furnace services, heat pump services, and more! 

Contact Us Today!

Make
the Switch

Geothermal energy works like no other HVAC system you’ve ever seen. Energy savings can range from 20-30%!

Learn More

The Right-Sized System with LiDAR Technology

You can save thousands of dollars by having the right-sized heating and air conditioning system. It also makes your home far more comfortable and increases system life by years (saving you even MORE money).

Most companies over-estimate the size of system you need. We use LiDAR to scan your home, calculate load requirements, and design systems with engineering-level accuracy. No guesses. No shortcuts. Your system fits your home perfectly—because we measured it perfectly.

Flat-Rate Pricing. Zero Surprises.

We believe in telling you the price before the work begins. No vague “hourly estimates.”

No mystery fees. Just clear, honest numbers you can trust.

Two uniformed workers smile at the camera from the front seats of an orange and blue service van, seen through the open window.

Real Consultations. Not Sales Pitches.

At Ernst, we slow down and ask questions.

We listen.

We want to understand your home, your comfort habits, and your concerns.

Whether we’re repairing a furnace or designing a system from scratch, we take the time to get it right—because that’s how our family has always done it.

We Treat Your Home Like Our Grandma’s

No mess. No rush.

Just thoughtful service from people who care.

Our Services

Heating

Furnace repair, maintenance, and installation—built on decades of experience and state-of-the-art diagnostics.

Cooling

AC and heat pump expertise, from seasonal tune-ups to high-efficiency system replacements.

Two HVAC technicians in blue uniforms hold tool bags and smile at the camera beside a service van parked outside a suburban house.
A technician kneels by an outdoor AC unit, actively using diagnostic tools to maintain it, with equipment and a service bag nearby.

Geothermal & High-Efficiency Systems

Ernst was one of the area’s earliest adopters of air-to-air heat pumps and geothermal systems. Today, our technicians remain among the most experienced in Illinois.

Air Quality

Cleaner air, fewer allergies, and healthier homes through purification, humidity control, and filtration solutions.

A Legacy Built by Three Generations

Al Ernst built the company through the 50s and 60s—installing furnaces, digging crawl spaces, fabricating ductwork, and learning every trade skill the hard way.

Two men smile as they stand before display cases packed with model cars and memorabilia in a brightly lit room.

Roger Ernst returned to Hamel in 1977 to expand the company, adopting new technologies like heat pumps, partnering with Lennox, and growing Ernst into a regional HVAC leader.
Today, Dusty Ernst leads the company with the same values his grandfather started with—paired with modern tools, top-tier training, and a commitment to protect the legacy that built this community staple.

Three generations. One mission:
Do the right thing for the customer. Every time.

The Ernst Comfortizer Plan

We created the ultimate plan to keep you and your family comfortable year round and save you BIG money.

  • Two Youngerizers per year (heating + cooling)
  • Priority service
  • 15% off repairs and maintenance items
  • 5% off system replacements
  • Extended repair warranty
  • Automatic scheduling—we call YOU.

All for just $16 per system per month.

Emergency Heating & Emergency AC Repair

Ernst offers emergency heating and AC repair services in the Metro East region, including Hamel, Edwardsville, Highland, Greenville, Maryville, and the surrounding areas, 365 days a year.

Call 618.633.2244  any time, day or night, and you’ll speak to a live representative who can send out an HVAC contractor immediately. We repair any make or model of HVAC system, whether we installed it or not.

Our Emergency HVAC repair services include:

Heating & Cooling Installation

With a range of models available, your Ernst HVAC installation technician can help you decide which one is the best heating and cooling fit for your home, usage requirements, and budget. Our HVAC company installs the following types of heating and air conditioning systems:

Our Energy Savings Agreement

Regular HVAC maintenance helps keep your heating and cooling system operating at its highest efficiency. At Ernst, we offer Energy Savings Agreements to help you save!

The Ernst Energy Savings Agreement gives you:

  • Two precision HVAC tune-ups a year (one on the air conditioner, one on the furnace).
  • A 15% discount on any HVAC repairs and filters
  • Priority scheduling.
  • Automatic scheduling of HVAC maintenance appointments.
  • Peace of mind knowing that you have done everything you can to reduce the risk of a major breakdown!

Why Choose Ernst for Heating & Cooling Services in Metro East Illinois?

  • We spend time with you. Our HVAC company will make sure that you understand the system we’re installing, how long it will take, and how much it costs—and why. They will also present options to you if applicable.
  • We are heating and cooling experts. Ernst’s HVAC installation technicians go through a minimum of one hour of training a week to help them stay on top of new technologies, HVAC trends, and new ways to help our clients.
  • We are innovative. Ernst Heating & Cooling was the first in the Metro East region, including Hamel, Edwardsville, Highland, Greenville, Maryville, and surrounding areas, to offer geothermal energy systems, and we are always striving to be at the forefront of the HVAC industry.
  • We offer financing options. We have several plans available through reputable national companies to help finance your HVAC replacement on your new furnace, new heat pump, or new air conditioner.

Call Today for Metro East Illinois HVAC Service

Ernst Heating & Cooling is proud to offer our friends and neighbors top-quality heating and cooling services in the Metro East region, including Hamel, Edwardsville, Highland, Greenville, Maryville, and surrounding areas.

Call Ernst at 618.633.2244 or schedule a service appointment online! 

Service in Just Hours!

With Ernst Heating & Cooling, you’ll get prompt, reliable service,
flat-rate pricing, and honest consultations. Every time.

"*" indicates required fields

This field is for validation purposes and should be left unchanged.
Name*
Address*
Are you a Preferred Club member?
Read More
See More
Scroll to Top