4.7 
2.8k+ *The Angi rating for Nest Installation companies in O Fallon, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Nest Installation needs.
*The HomeAdvisor rating for Nest Installation companies in O Fallon, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Nest Installation needs.
Last update on May 27, 2026
Serving O Fallon, MO and surrounding areas
Approved
In business since 2009
Warranties offered
Credit card accepted
"They were professional from the phone call to the installation. He had everything he needed to replace the hot water heater and proceeded. I would definitely recommend Hosack Plumbing."
+2
Serving O Fallon, MO and surrounding areas
Approved (Corporate)
In business since 2010
Free estimates
Emergency services offered
"Peace of mind at last! Joffre was wonderful explaining everything and even came over to our home during install to answer any further questions. Pat was an excellent installer and we can finally be rest assured that we are safe at home and away. Thanks again Alarm Protection Group!"
+1
Serving O Fallon, MO and surrounding areas
Approved
Super Service Award Winner
In business since 1998
Free estimates
Warranties offered
"great, on time, expert installation, reasonable price."
+19
Serving O Fallon, MO and surrounding areas
Approved
Super Service Award Winner
In business since 2024
Emergency services offered
Small jobs welcome
"Excellent job. He was on tine and quickly repaired our stuck front door. I will save his name for any future handyman jobs needed"
+1
Serving O Fallon, MO and surrounding areas
Approved
In business since 1947
Free estimates
Emergency services offered
"Great Experience. I was concerned about the 22 yr age of our air conditioner able to keep working and wonder if a long wait time to get a product shipped like refrigerators last year, I called for a quote and within a week it was installed and working! Installers worked tirelessly until their work was done, clean and neat!"
+2
Serving O Fallon, MO and surrounding areas
Approved
In business since 2001
Free estimates
Small jobs welcome
"There was a problem with the first installer that did not show back up to complete the installation I placed a call to the owner and he immediately sent another installer and he finished the job and got everything working. Everything is working fine"
+35
Serving O Fallon, MO and surrounding areas
Approved
In business since 1976
Free estimates
Emergency services offered
"Very quick and courtious installers. They answered my questions even on other projects they were not working on at the time."
Serving O Fallon, MO and surrounding areas
Approved (Corporate)
Super Service Award Winner
In business since 1979
Free estimates
Emergency services offered
"Installed ok and he left ! No complaints!"
+18
Serving O Fallon, MO and surrounding areas
Approved (Corporate)
Super Service Award Winner
In business since 1874
Free estimates
Emergency services offered
"I had a wonderful experience with the Protect Your Home - ADT Authorized Dealer. Sam installed the system at my home and was very helpful and did a great job with both the wiring and wireless installations. I would highly recommend ADT and Sam for security alarm installation."
+35
Serving O Fallon, MO and surrounding areas
Approved
In business since 2003
Free estimates
Emergency services offered
"Very informative and detailed. Parts we needed not in stock we just couldn’t wait due to extreme heat conditions. Other than that I would highly recommend"
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