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Advanced Heating & Air of Ottawa, Inc

"Serving Marseilles, Seneca And Ottawa Areas Since 1999"

About Us

Advanced Heating & Air Of Illinois, Inc. is your trusted HVAC partner in Marseilles, IL, serving LaSalle County and Ottawa. We specialize in both commercial and residential heating and cooling services, providing expert installation, maintenance, and repairs. Our team excels in handling everything from boilers to water heaters and innovative tankless systems, ensuring your space remains comfortable and efficient. Rely on us for all your HVAC needs. Reach out today for outstanding service! Our business hours are Monday to Friday, 8 AM to 5 PM. For emergencies, feel free to call, leave a message, or text us.

Areas Served

Our Professional Associations

Chamber of Commerce

Our Certifications

Licensed
Insured

What We Offer

Our Specialties include:

Heating Service Calls
Air Conditioning Service Calls
New Commercial Insulation
New Residential Insulation
Commercial AC Equipment
Residential AC Equipment
Services All Makes and Models
Furnace Repair & Installation

Our Services include:

HVAC – Complete heating, ventilation, and air conditioning services to maintain year-round indoor comfort.
Furnace Repair – Diagnostic and repair services to restore furnace performance and home heating.
Furnace Installation – Professional installation of energy-efficient furnaces tailored to your space and needs.
Air Conditioner Repair – Fast and reliable AC repairs to resolve cooling issues and improve system efficiency.
Air Conditioner Installation – Expert installation of air conditioning systems for optimal comfort and energy savings.
Boiler Repair – Skilled repair of boiler systems to fix leaks, pressure problems, and heating failures.
Boiler Installation – Installation of modern, high-efficiency boilers for consistent and reliable heating.
Water Heater Repair – Repair services for traditional and tankless water heaters to restore hot water quickly.
Water Heater Installation – Installation of water heaters suited to your household’s size, usage, and energy goals.
Tankless Water Heater Repair – Specialized repair for on-demand water heaters to fix flow rate and heating issues.
Tankless Water Heater Installation – Space-saving, energy-efficient installation of tankless systems for instant hot water.
Park Models – HVAC and plumbing solutions customized for park model homes and RVs, including compact system design and installation.

Our Brands include:

Our Products include:

Furnaces
Air Conditioners

Testimonials

On 6/27/2026 Lynda Flatness had this to say:
We felt lucky to find Chris who was able to provide us with a new unit within the week, even though he was very busy. You can definitely appreciate someone who you can rely on to get the job done well and efficiently these days. We'll definitely be passing his name on with high recommendation. Testimonial written by Lynda Flatness on this site.

On 5/30/2026 Tom Waldron had this to say:
Chris is now our go to pro for our HVAC needs. Solved our AC issue in a short visit on a Saturday no less. Very friendly and reliable. Testimonial written by Tom Waldron on this site.

On 4/17/2026 Richard Gritt had this to say:
Chris installed a complete new house AC, Heating and all of the runs did an excellent job. And answered all of our questions and service calls. I highly recommend Advanced Heating & Air.

On 2/25/2026 Mason Hunt had this to say:
My go to for heating and air in the area since I moved here. Always willing to work with you on getting repairs and things done in a timely manner.

On 2/24/2026 Adam Chapman had this to say:
Chris was very responsive, communicative and easy to work with. He diagnosed the problem and got the furnace running with a spare sensor since all the supply houses were closed on a Saturday afternoon. Highly recommended and will be calling him again for any future issues

Contact Us

Advanced Heating & Air of Ottawa, Inc
Ottawa, IL 61350
Phone: (815) 343-7637
Email: aha@mtco.com

Where To Find Us

Payment Types Accepted

Personal Checks, Discover, American Express, Debit Cards, MasterCard, Visa, Venmo

Our Hours

Monday: Open 24 Hours Call or Text on Nights or Weekends for Emergency Service
Tuesday: Open 24 Hours Call or Text on Nights or Weekends for Emergency Service
Wednesday: Open 24 Hours Call or Text on Nights or Weekends for Emergency Service
Thursday: Open 24 Hours Call or Text on Nights or Weekends for Emergency Service
Friday: Open 24 Hours Call or Text on Nights or Weekends for Emergency Service
Saturday: Open 24 Hours Call or Text on Nights or Weekends for Emergency Service
Sunday: Open 24 Hours Call or Text on Nights or Weekends for Emergency Service

News

As a locally and family‑owned contractor, Advanced Heating & Air of Illinois has proudly served Ottawa, Seneca, and nearby communities with reliable HVAC services, preventative maintenance, and top‑quality workmanship for over a decade.

Whether your furnace is failing or your boiler needs attention, our team specializes in installation, maintenance, and repair of all major systems—including tankless water heaters. Keep your home comfortable and energy‑efficient with expert care from a locally operated HVAC company.

Need dependable HVAC service? Advanced Heating & Air Of Illinois, Inc. provides trusted heating and cooling solutions for homes and businesses across Marseilles, Ottawa, and surrounding areas. From furnaces to central air systems, our experienced technicians deliver fast, professional results you can count on.

Your Comfort Is Our Priority! 🌡️
Whether it’s freezing outside or the summer heat is on the way, Advanced Heating & Air Conditioning has you covered. We provide reliable HVAC solutions to keep your home comfortable year-round.
✅ Expert heating & cooling services
✅ Energy-efficient installations
✅ Fast, friendly repairs
Don’t settle for less—choose the team that puts your comfort first!
👉 Call to schedule your service today (815) 343-7637

Stay Warm This Winter! ❄️🔥
Cold weather is here—make sure your home stays cozy and comfortable!
At Advanced Heating & Air Conditioning, we provide expert heating services to keep your system running efficiently all season long.
✅ Furnace installation & repair
✅ Heating system maintenance
✅ Emergency service available
Don’t wait until the chill sets in—schedule your service today!
👉 Learn more https://advancedheatingandairconditioningil.com/

FAQ

How often should I have my HVAC system serviced?

We recommend servicing your HVAC system at least once a year for optimal performance, ideally before the peak heating and cooling seasons.

Do you offer emergency HVAC services?

Yes, we offer emergency services. Please call or text us for immediate assistance.

What are your business hours?

We are open Monday through Friday from 8:00 AM to 5:00 PM.

Should I cover my AC unit?

You can cover your AC unit, but we recommend removing the cover. Covering can trap moisture, leading to potential damage. Instead, remove debris regularly and ensure proper airflow.