4.7 
81 *The Angi rating for Heating And Air Conditioning Service companies in Herculaneum, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.
*The HomeAdvisor rating for Heating And Air Conditioning Service companies in Herculaneum, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.
Last update on July 19, 2026
Serving Herculaneum, MO and surrounding areas
Approved
In business since 2003
Free estimates
Emergency services offered
"A-ok! Dunn OneHour HVAC is always top notch!"
Serving Herculaneum, MO and surrounding areas
Approved
Super Service Award Winner
In business since 2017
Emergency services offered
Warranties offered
"Liberty did a fantastic job identifying and rectifying airflow problems with our existing Hvac system that was installed less than two years ago by another company. They were punctual, responsive and incredibly knowledgeable. I highly recommend them."
+10
Serving Herculaneum, MO and surrounding areas
Approved
In business since 2014
Free estimates
Emergency services offered
"MCS techs were very courteous. New HVAC system install went well. They explained all their work professionally. Also found a crack in the flue and replaced which was overlooked by a previous contractor. They are very thorough and reasonable. I highly recommend MCS."
Serving Herculaneum, MO and surrounding areas
Approved
In business since 1954
Free estimates
Emergency services offered
"They came out and cleaned the outside unit. The a/c is doing a better job keeping up with this heat."
+1
Serving Herculaneum, MO and surrounding areas
Approved
In business since 2006
Free estimates
Credit card accepted
"Great guy and good service had me fixed up went out of his way to get ac going."
Serving Herculaneum, MO and surrounding areas
Approved
In business since 1980
Free estimates
Emergency services offered
"The service tech was prompt, friendly, and helpful. They identified the issue with two fridges, and they recommended replacement or adjustment rather than costly unnecessary repairs."
Serving Herculaneum, MO and surrounding areas
Approved
In business since 1982
Emergency services offered
Warranties offered
Founded in 1982. Team members that are drug tested and background checked insuring that the people in your home are safe. We specialize in repairing and replacing residential heating and air conditioning systems. "Fixed Right or It's Free"\nTechs available Sat & Sun call for appointment.
Serving Herculaneum, MO and surrounding areas
Approved
In business since 2025
Emergency services offered
Credit card accepted
"Had a few issues with my HVAC. Austin was fantastic and fixed everything the same time. Was late"
Serving Herculaneum, MO and surrounding areas
Approved
In business since 2025
Free estimates
Emergency services offered
"They did a fabulous job in cleaning all the vents in the house. The entire crew was very professional and treated our home with care. Even our dog loved them! We highly recommend using them!"
+21
Serving Herculaneum, MO and surrounding areas
Approved
Free estimates
Emergency services offered
Warranties offered
Property maintenance is an essential yet often daunting task for homeowners and businesses. Finding the time or the right tools to carry out these tasks can be difficult and exhausting, leading to delays and frustration. At House Doctors of St Louis, we are here to alleviate these challenges, providing reliable solutions to all your maintenance and improvement needs efficiently and professionally.\n\nOur skilled handyman team excels in managing an extensive range of tasks for residential and commercial projects alike. We transform overwhelming to-do lists and stalled projects into completed tasks, ensuring a smooth process from start to finish. Whether it's quick repairs or major renovations, our technicians handle a variety of requests backed by free estimates to initiate the process, thus making your goals achievable.\n\n
+1
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