Heating Repair & Installation
Furnace and heat pump repair and installation built for Midwest winters that regularly drop well below freezing.
- ✓ Gas and electric systems serviced
- ✓ Full safety inspection included
Rantoul's Small-Town Heating & Cooling Team
Heating and Air Conditioning Repair for Rantoul and the Surrounding Farm Country
Northmark Heating and Air repairs, installs, and maintains heating and air conditioning systems in Rantoul — a small town north of Champaign-Urbana surrounded by open farmland, where winter winds sweep across flat prairie and many homes and buildings date back to the former Chanute Air Force Base era.
Serving Rantoul & Surrounding Areas
About Us
Built for Rantoul's Small-Town Homes
Northmark Heating and Air is based at 118 E Sangamon Ave in Rantoul, a village of a few thousand homes whose history is tied to the former Chanute Air Force Base and whose winters are shaped by the open prairie around it.
Owner Vaughn Keller built the business for that kind of community: honest, straightforward service on older homes and buildings, with the furnace reliability flat-country winters demand and the AC capacity Illinois summers require.
What We Do
Our Air Conditioning Repair Services
Furnace and AC repairs and installs for Rantoul's homes and older buildings.
AC Repair
AC repair covering capacitors, contactors, refrigerant leaks, and blower motors, with experience on older equipment.
- ✓ Diagnosis before any repair begins
- ✓ Experience with aging systems
AC Installation
Central air and ductless mini-split installation, including options for older homes and buildings.
- ✓ Load-calculated system sizing
- ✓ Retrofit options for older buildings
Maintenance Plans
Fall furnace tune-ups and spring AC tune-ups timed ahead of each season's real demands.
System Diagnostics
In-depth troubleshooting for systems with recurring or unexplained issues.
Indoor Air Quality
Filtration and humidity control options for Illinois's swing between dry winters and humid summers.
What It Costs
Air Conditioning Repair Cost Guide for Rantoul
General ranges for orientation — every job gets a firm, written price after a free on-site diagnosis, before any work begins.
Diagnostic / Service Call
$79 – $139
Credited toward the repair if you move forward the same visit
Furnace Repair
$150 – $650
Igniters, flame sensors, and heat exchanger inspections for real Midwest cold
Capacitor or Contactor Replacement
$140 – $320
One of the most common reasons a system hums or clicks but won't start
Refrigerant Leak Repair & Recharge
$280 – $1,100
Price depends on leak location and refrigerant needed
Ductwork Repair or Sealing
$250 – $900
Common on older homes with aging ductwork
Central AC or Furnace Installation
$3,200 – $9,000
Sized correctly for older homes and buildings
Ranges reflect typical air conditioning repair costs and vary by system age, access, and parts availability. Not a quote — call (447) 202-0633 or request a free on-site estimate for your exact price.
Why Choose Us
Why Rantoul Homeowners Trust Northmark Heating and Air
Real Winter Experience
Open-prairie winters are hard on heating systems — we treat furnace work as a core service.
Rantoul Based
Local scheduling in Rantoul and the surrounding farm-country communities.
Honest, Straightforward Service
Plain explanations of what's wrong and what it costs.
Owner-Operated
Vaughn Keller is hands-on with how the business runs and how jobs are handled.
A Homeowner's Guide
How to Choose an HVAC Company in Rantoul
In a small town, you want a company that shows up and explains things plainly. Here's what to check.
Ask About Winter Reliability
Confirm the company treats furnace repair as a core service, not an afterthought to AC work.
Get the Diagnosis Before the Fix
A technician should explain what's actually wrong before quoting a repair.
Confirm Licensing and a Written Price
Illinois HVAC work should be performed under a licensed contractor, with a firm price in writing before any work starts.
Where We Work
Proudly Serving Rantoul & Nearby Communities
Northmark Heating and Air serves Rantoul and the surrounding communities.
- Rantoul
- Thomasboro
- Gifford
- Ludlow
- Paxton
- Champaign
FAQ
Frequently Asked Questions
Yes, honest diagnosis of older equipment is a large part of what we do.
Rantoul, Thomasboro, Gifford, Ludlow, Paxton, and Champaign.
Yes — open-prairie winters mean a dependable furnace matters just as much as summer AC.
Yes, fall furnace tune-ups and spring AC tune-ups timed ahead of each season.
We're open every day from 7:00 AM to 10:00 PM. Call (447) 202-0633 to schedule.
Get In Touch
Request Your Free Quote
Tell us about your system and we'll follow up to schedule a visit.
Ready to Get Started?
For heating or cooling work in Rantoul, Northmark Heating and Air is ready to help.