Mon-Clair Heating and Cooling LLC

Top Pro

Licensed

$80/on-site estimate

Estimated price

Select a service

Zip code

A/C unit

Property size

System type

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 182 times

Serves Millstadt, IL

Background checked

License verified

1 employee

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

Work needed

System type

Split system

Packaged system

Other

Building height

Single-level

Two-story

Three-story

Projects and media

Reviews

Customers rated this pro highly for responsiveness, professionalism, and work quality.

Excellent 4.9

96 reviews

5

98%

4

0%

3

1%

2

0%

1

1%

Read reviews that mention:

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

Mr f.

Jan 21, 2026

•

Hired on Thumbtack

Details: Replacement • Central heating or cooling • Condo/Apartment • Homeowner

Thermostat Installation or Repair

Sylvia H.

Dec 2, 2025

•

Hired on Thumbtack

Details: Furnace • No heat • Closet • Three-story building • Condo or apartment

Heating System Repair or Maintenance

Robyn W.

Nov 7, 2025

•

Hired on Thumbtack

Details: Heat pump • Leaking • Single-level building • House

Heating System Repair or Maintenance

Bill S.

Aug 16, 2025

•

Hired on Thumbtack

Details: New installation • Central heating or cooling • House

Thermostat Installation or Repair

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.