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Top-Rated Thermostat installers and replacers in Saint-louis - Updated Nov 2026

Avatar for American Society of Heating & Cooling Specialists LLC
American Society of Heating & Cooling Specialists LLC
4.5(
21
)
Thermostat - Install or Replace

Serving Saint-louis, MO and surrounding areas

Approved

In business since 1995

Free estimates

Emergency services offered

"Patrick was extremely kind and very professional! We moved into our first home and we were not able to use our new laundry unit due to our gas piping being old and outdated. We are so very thankful for the fast response and the amazing work! Thank you so much!"
DOLLAR TREE COMMODE
DOLLAR TREE
DOLOLAR TREE
Patriot Club Member
Patriot Club Member

+9

25 neighbors recently requested a quote
Recommended by38%of homeowners
Avatar for Wise Men Heating and Cooling, LLC
Wise Men Heating and Cooling, LLC
5.0(
7
)
Thermostat - Install or Replace

Serving Saint-louis, MO and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"The father and son duo was very professional. My emergency happened after typical business hours but they still came out take a look at my thermostat. Very polite and informative. Once the store opened, they got what they needed and returned the next morning. They did an excellent job and are very affordable. I look forward to continuing business with them."
Full furnace
Full furnace
Full furnace
Heating Cooling HVAC
HVAC

+2

Response time7 hrs
Response rate100%
5 neighbors recently requested a quote
Avatar for J P Frisch Construction Svc Inc
J P Frisch Construction Svc Inc
4.7(
749
)
Thermostat - Install or Replace

Serving Saint-louis, MO and surrounding areas

Approved

In business since 2009

Free estimates

Credit card accepted

"Needed several projects done around my home and Jon completed them all with ease. I've used his company several times and he and his team are always on time and provide quality work. I highly recommend them for any home project - large or small."
Response time11 hrs
1 neighbors recently requested a quote
Recommended by92%of homeowners
Avatar for G.O.A.T heating and cooling
G.O.A.T heating and cooling
5.0(
6
)
Thermostat - Install or Replace

Serving Saint-louis, MO and surrounding areas

Approved

In business since 2020

Credit card accepted

Customers say: Quick response

"Very knowledgeable and professional. Work was done quickly and at a very reasonable price. He is a true professional. Would highly recommend and he will be the first call if my system needs to be serviced again."
HVAC
Full system
Full system
New Heat pump
New Heat pump

+17

16 neighbors recently requested a quote
Recommended by100%of homeowners
Master Remodel & Construction
4.7(
18
)
Thermostat - Install or Replace

Serving Saint-louis, MO and surrounding areas

Approved

In business since 2017

Free estimates

Customers say: Quick response

"We have used this company for both rental and owner-occupied properties. They replaced the roof, gutters, and worked with the company to make sure that our awnings and other items were replaced. They also worked very well with our insurance company and we had no problems at all. Jacob made everything so easy that if we ever need anything else done and they can do it, they have the job."
Car port
Car port
Car port
Bathroom remodel
Bathroom remodel

+11

Response time2 hrs
Recommended by100%of homeowners
Avatar for Aire Serv of St. Louis
Aire Serv of St. Louis
5.0(
5
)
Thermostat - Install or Replace

Serving Saint-louis, MO and surrounding areas

Approved

In business since 2024

Free estimates

Emergency services offered

Looking for reliable HVAC service in St. Louis? Aire Serv of St. Louis is your local expert for residential and commercial heating and cooling. From emergency AC repair during humid Missouri summers to furnace maintenance before the winter chill, our professional technicians are available to keep your home comfortable. We pride ourselves on transparent, upfront pricing, no overtime charges, and the "Done Right Promise." Whether you need a system replacement, duct cleaning, or a routine tune-up in Fenton, Webster Groves, or Kirkwood, we are the team you can trust. Breathe easy with Aire Serv—your comfort is our top priority. Call us today to schedule your service!

Logo
31 neighbors recently requested a quote
Avatar for FixPro
FixPro
5.0(
5
)
Thermostat - Install or Replace

Serving Saint-louis, MO and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

FixPro is a locally owned and operated handyman service proudly serving St. Louis, St. Charles, Lincoln, Warren, Franklin, and Jefferson Counties. We specialize in high-quality home repairs, carpentry, drywall, painting, flooring, deck repair, and general maintenance—handling everything from small fixes to larger improvement projects with precision and professionalism.\n\nWith years of hands-on experience across construction, maintenance, and service industries, I built FixPro to deliver what most contractors don’t: clear communication, reliable scheduling, and work done right the first time. We show up when we say we will, diagnose issues properly, and provide straightforward solutions without cutting corners.\n\nOur approach is simple—treat every home like it’s our own. We focus on clean workmanship, long-term durability, and customer satisfaction. If you want it done right the first time, FixPro is ready.\n\nNeed Something Fixed? Hire a Pro.

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FAQs for thermostat installation and replacement projects in Saint-louis, MO

Smart thermostats may be worth it for many homeowners. They come with various features, including voice control and smartphone apps. Vacation mode can help lower energy usage when you’re out of town for an extended period. Alert warnings let you know about major spikes or drops in temperature. Smartphone apps can track energy usage, and smart thermostats can learn your routine over time to adjust your temperature and reduce wasted energy consumption automatically.

You typically do not need more than one smart thermostat. While it’s common to see multiple mechanical thermostats throughout a large home, multiple smart thermostats may try to override each other. This can lead to problems with the HVAC system. Ensure the unit you buy has the option for dual- or multi-zoned systems to avoid compatibility issues.

Installing a programmable or smart thermostat may save you $180 per year in utility costs. A big part of this comes from a smart thermostat’s ability to learn and adapt to your regular routines. With smartphone apps or web-based interfaces, you also have the option to control your thermostat when you’re not home.

The Saint-louis, MO homeowners’ guide to thermostat installations and replacements

From average costs to expert advice, get all the answers you need to get your job done.