Hi my Name is Nick Antonas owner of Mon-Clair Heating and Cooling, we are locally owned and operated. I have 20+ years of experiece in the HVAC industry. We are licensed and insured. We believe in doing quality work at an affordable price. We are an American Standard heating and Cooling dealer as well as a Mitsubishi Mini-Split dealer, but we work on all makes. We look forward to serving you for your residential and light commercial heating and cooling needs. We offer 10% off for military/First Responders and 5% off for Senior Citizens.
Overview
Current Top Pro
Hired 250 times
Background checked
License verified
2 employees
3 years in business
Business hours
SunClosedMon8:00 am - 6:00 pm
Payment methods
This pro accepts payments via Cash, Credit card, and Square cash app.
Top Pro status
Top Pros are among the highest-rated, most popular professionals on Thumbtack.
2025
Credentials
License verified
HVAC
License region: St. Louis, MO
Background checked
Passed by Nicholas Antonas on Jan 26, 2025.
Services offered
Duct and Vent Services Needed
Install ducts and vents
Remove existing ducts and vents
Replace existing ducts or vents
Duct and vent type
Heating
Dryer
Exhaust
Duct material
Rigid sheet metal
Flexible non-metallic material
Fiberglass
Projects and media
Projects and media
Reviews
Customers rated this pro highly for work quality, responsiveness, and professionalism.
Excellent 4.9
128 reviews
5
97%
4
1%
3
1%
2
0%
1
1%
Your trust means everything to us. Learn about our review guidelines.
Read reviews that mention:
Rhina L.
Jun 13, 2026
•
Hired on Thumbtack
Nick was able to come out pretty quickly for a service call, he was thorough and detailed. He diagnosed the issue, give me an estimate and an appointment to correct the problem. His pricing was very reasonable, I called around and compared. It was a great experience and I highly recommend.
Details: Repair • Only warm air is blowing from the vents • Basement • Outside • House • Owner
Central Air Conditioning Repair or Maintenance
Fah I.
Oct 28, 2025
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Hired on Thumbtack
I recently moved to the Belleville, IL area and found this HVAC company through Thumbtack. Nick did an outstanding job fixing my duct and vent line. The quality of his work really shows. Before, I used to hear noise every time the heater turned on, but now it’s completely quiet and runs smoothly. He was professional, on time, and explained everything clearly. I highly recommend Nick and his team to anyone looking for reliable and honest HVAC service in the area! Great job overall
Details: Furnace • Heat pump • Unusual noises from inside • Garage • Single-level building • House
Heating System Repair or Maintenance
Sanjay f.
Jun 8, 2026
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Hired on Thumbtack
Father & Son HVAC working together was impressive to me They were professional, honest, and very knowledgeable from start to finish. They arrived on time, quickly diagnosed the issue, and explained everything clearly before beginning any work. The quality of their service was excellent, and they made sure everything was working perfectly before they left.
Our furnace stopped blowing air, pipes were frozen, hot Summer days. Nick came over same day, diagnosed that it was a bad capacitor and had a replacement in his truck that was installed within the first 10 mins of his arrival. It all works perfectly and at a far cheaper cost than I had feared. Highly recommend!
Details: Repair • The power is on, but the fan won't run • Basement • Outside • House • Owner
Central Air Conditioning Repair or Maintenance
Paul S.
Aug 1, 2026
•
Hired on Thumbtack
Nick did a great job solving my freezing evaporator coil. I guess I need to clean my unit more than I realized! Lesson learned!
Great service!
Details: Routine maintenance • My A/C unit is frozen • Basement • Outside • House • Owner
Central Air Conditioning Repair or Maintenance
FAQs
What should the customer know about your pricing (e.g., discounts, fees)?
We charge an $90 service call fee to diagnose your issue. Parts and labor are extra. Standard 1" filter replacement is $10. We offer a 10% discount for Military and First Responders. We also offer a 5% discount for Senior citizens.
What is your typical process for working with a new customer?
We call the customer and set up an appointment for a 2 hour time block that meets their and our availability.
What education and/or training do you have that relates to your work?
I have a HVAC certificate from Jefferson College in Hillsboro MO which i received in the year 2000. I also carry a St. Louis County and City Journeyman's License.
