This pro has verified their business license with Thumbtack.
Licensed
This pro has verified their business license with Thumbtack.
Type of heating system
Heating system problems
Responds in about 2 hours
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About
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
1 similar job done near you
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
Type of heating system
Heating system problems
No problem, just need maintenance
No heat
Not enough heat
Unusual noises from inside
Building height
Single-level
Two-story
Three-story
Projects and media
Projects and media
Reviews
Customers rated this pro highly for work quality, professionalism, and responsiveness.
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
Sanjay f.
Jun 8, 2026
•
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
Richard B.
Mar 23, 2026
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Hired on Thumbtack
Nicholas Montclair, owner of Mon-Clair Heating and Cooling LLC, provided outstanding service from start to finish. His level of professionalism and knowledge of heating and cooling systems truly set him apart. This was complex job, and Nicholas handled it with confidence and expertise. He took the time to understand the situation, explain the process, and ensure everything was done correctly. His work ethic is second to none-he worked hard, stayed focused, and delivered results. It’s clear he takes pride in his craft and is committed to doing high-quality work. If you’re looking for someone who is reliable, knowledgeable, and professional. I highly recommend Nicholas and Mon-Clair Heating and Cooling LLC. I would absolutely use his service again.
Details: Install ducts and vents • Split system • I already have the A/C unit • Basement • Ground floor • More than 4,000 sq ft • Two stories • House
Central Air Conditioning Installation or Replacement
LeAnna R.
Jan 31, 2026
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Hired on Thumbtack
My furnace is over 20 years old, and I was fully expecting to hear that it needed to be replaced. Instead, Nick came out, diagnosed the issue quickly, and had it running better than it has in years. His knowledge and experience were obvious from the moment he started working.
On top of that, his pricing was extremely fair — especially considering the age of the unit and the time he spent making sure everything was done right. It’s rare to find someone who is both skilled and honest, but Nick is exactly that. I’m grateful for the quality service and will definitely call him again for any future HVAC needs.
Details: Furnace • No heat • Basement • Single-level building • House
Heating System 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.
