Get matched with top heating and air conditioning pros in Cottleville, MO
There are 28 highly-rated local heating and air conditioning pros.
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TRUSTED BY HOMEOWNERS
4.6 
183 Verified Reviews for Heating And Air Conditioning Service pros in Cottleville, MO
*The Angi rating for Heating And Air Conditioning Service companies in Cottleville, 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 Cottleville, 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 May 06, 2025
Heating and air conditioning pros in Cottleville
Your satisfaction is very important to us, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out our services offered and call or click to schedule a free estimate today.
"Amazing, I will call him again, nice conversation, professional work its"
Muhamed Rodjak S on June 2024
Your satisfaction is very important to us, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out our services offered and call or click to schedule a free estimate today.
"Amazing, I will call him again, nice conversation, professional work its"
Muhamed Rodjak S on June 2024
We guarantee your satisfaction and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service. Check out our services offered and call or click to schedule an estimate today!
"If I could give a zero I would. They gave us a time to be to us between 7 am - 11 am. Then was told they would come after lunch. It’s almost like and can’t get ahold of them they finally answer and say they will be there at 4. Call at the 3:50 and said technician was in route and will be there at 4. It’s 5 and no one ever showed up still could not get ahold of anyone. Very disorganized and unreliable company to hire."
Tynesha O on June 2024
We guarantee your satisfaction and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service. Check out our services offered and call or click to schedule an estimate today!
"If I could give a zero I would. They gave us a time to be to us between 7 am - 11 am. Then was told they would come after lunch. It’s almost like and can’t get ahold of them they finally answer and say they will be there at 4. Call at the 3:50 and said technician was in route and will be there at 4. It’s 5 and no one ever showed up still could not get ahold of anyone. Very disorganized and unreliable company to hire."
Tynesha O on June 2024
We are a locally and family owned business. We service, maintain and install heating, air conditioning and refrigeration. Our services are for both residential and commercial customers.
"He was very nice and efficient, answer all my questions."
Brenda S on August 2023
We are a locally and family owned business. We service, maintain and install heating, air conditioning and refrigeration. Our services are for both residential and commercial customers.
"He was very nice and efficient, answer all my questions."
Brenda S on August 2023
We specialize in all phases of heating and cooling services, installs, repairs, maintenance, and more! We service St. Louis and surrounding counties. We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Call -or- click to schedule an estimate today!
"They were the only HVAC company that could respond quickly when the temperatures outside were in the single digits. They did not take advantage of the situation by over charging."
Alan H on December 2022
We specialize in all phases of heating and cooling services, installs, repairs, maintenance, and more! We service St. Louis and surrounding counties. We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Call -or- click to schedule an estimate today!
"They were the only HVAC company that could respond quickly when the temperatures outside were in the single digits. They did not take advantage of the situation by over charging."
Alan H on December 2022
We pride ourselves on the quality work we provide, while delivering great customer service. Check out our services offered and call or click to schedule an estimate today!
"Explains what is happening. If it’s a simple fix, he fixes it, instead of charging you for a huge repair when I wouldn’t know the difference. Trustworthy and communicative."
becky p on March 2024
We pride ourselves on the quality work we provide, while delivering great customer service. Check out our services offered and call or click to schedule an estimate today!
"Explains what is happening. If it’s a simple fix, he fixes it, instead of charging you for a huge repair when I wouldn’t know the difference. Trustworthy and communicative."
becky p on March 2024
Reliable HVAC Professionals Whether you need a maintenance check or an emergency repair on a heating or cooling unit, we are available to handle all of your heating, cooling, and ventilation needs. We strive to exceed your expectations by ensuring that each of our clients receives individualized service. Individualized HVAC Options We will work with you to find HVAC solutions that fit your heating and cooling needs. We will provide you with a full consultation to explain all of your available options so that you you can choose the system that is right for your home or business. Customer Satisfaction Guaranteed We serve residential heating and cooling equipment and offer a variety of money-saving solutions. We combine our use of the highest quality parts and equipment, and our dedication to delivering exceptional service to provide you with top quality service. Warranty included with all services.
"It went great. They were on time. They were very professional. They came in and got the job done."
Kalonda C on May 2021
Reliable HVAC Professionals Whether you need a maintenance check or an emergency repair on a heating or cooling unit, we are available to handle all of your heating, cooling, and ventilation needs. We strive to exceed your expectations by ensuring that each of our clients receives individualized service. Individualized HVAC Options We will work with you to find HVAC solutions that fit your heating and cooling needs. We will provide you with a full consultation to explain all of your available options so that you you can choose the system that is right for your home or business. Customer Satisfaction Guaranteed We serve residential heating and cooling equipment and offer a variety of money-saving solutions. We combine our use of the highest quality parts and equipment, and our dedication to delivering exceptional service to provide you with top quality service. Warranty included with all services.
"It went great. They were on time. They were very professional. They came in and got the job done."
Kalonda C on May 2021
"Fantastic. Jeff & Jim were prompt, professional, and courteous. The provided multiple options to solve our problem and never tried to push a sale. Their work was done with excellence. They worked to keep our home clean and were incredibly friendly. I would definitely recommend Illy HVAC to anyone."
Steve C on June 2020
"Fantastic. Jeff & Jim were prompt, professional, and courteous. The provided multiple options to solve our problem and never tried to push a sale. Their work was done with excellence. They worked to keep our home clean and were incredibly friendly. I would definitely recommend Illy HVAC to anyone."
Steve C on June 2020
Specializing in new system installs, System replacement, indoor air quality products such as humidifiers, EAC electronic air cleaners, ductless systems (mini splits) & Wi-fi thermostats. Providing both light commercial & residential service in St. Louis! Our #1 priority is your satisfaction!
"I previously worked with another company to replace my furnace. The first company was extremely flakey and would constantly cancel my appointments or simply not show up. Eventually, I decided to go on Angie's List, and I found Siefert Mechanical. This company was extremely quick to get to my house, give me an estimate, and then perform the service. Not only did Siefert Mechanical quote me a price that was $600 less than the first company, they also never cancelled or missed an appointment. They came out once to give me a quote, then the very next time they came out to my house, they replaced my furnace. The quality of their work is extremely professional, and I would HIGHLY recommend this company for any heating/cooling service you need performed."
Aaron C on January 2021
Specializing in new system installs, System replacement, indoor air quality products such as humidifiers, EAC electronic air cleaners, ductless systems (mini splits) & Wi-fi thermostats. Providing both light commercial & residential service in St. Louis! Our #1 priority is your satisfaction!
"I previously worked with another company to replace my furnace. The first company was extremely flakey and would constantly cancel my appointments or simply not show up. Eventually, I decided to go on Angie's List, and I found Siefert Mechanical. This company was extremely quick to get to my house, give me an estimate, and then perform the service. Not only did Siefert Mechanical quote me a price that was $600 less than the first company, they also never cancelled or missed an appointment. They came out once to give me a quote, then the very next time they came out to my house, they replaced my furnace. The quality of their work is extremely professional, and I would HIGHLY recommend this company for any heating/cooling service you need performed."
Aaron C on January 2021
Hello, I'm a trained, certified professional Heating and A/C technician and General Contractor. I have additional skills in construction, electrical, minor plumbing, appliance installation and repair, landscaping and pretty much any and everything around the home. I've done apartment, house, commercial building and industrial machine maintenance for the last 15 years. I'm the owner/operator and I strive in providing excellent customer service while achieving a great and professional repour with my customers. We are an Insured and bonded company as well.
"I just wanted to take out time & say how pleased I am with the work of Justin & J5. This is the 2 job they have done for me. I am a single mom & they made sure my family & I were safe & taken care of. They have fixed & replaced my A/C, Furnace & Hot Water Heater. I will continue to be a loyal customer & refer anyone. The quality of work & communication was exceptional!"
B B on December 2023
Hello, I'm a trained, certified professional Heating and A/C technician and General Contractor. I have additional skills in construction, electrical, minor plumbing, appliance installation and repair, landscaping and pretty much any and everything around the home. I've done apartment, house, commercial building and industrial machine maintenance for the last 15 years. I'm the owner/operator and I strive in providing excellent customer service while achieving a great and professional repour with my customers. We are an Insured and bonded company as well.
"I just wanted to take out time & say how pleased I am with the work of Justin & J5. This is the 2 job they have done for me. I am a single mom & they made sure my family & I were safe & taken care of. They have fixed & replaced my A/C, Furnace & Hot Water Heater. I will continue to be a loyal customer & refer anyone. The quality of work & communication was exceptional!"
B B on December 2023
Heating and air conditioning services FAQs
Knowing how long your existing HVAC units can last is essential to determine if you need a repair or replacement. Typically, most modern air conditioning units can last between 15 to 20 years, and most furnaces can work properly for 15 to 30 years. If your HVAC system is on the older side and you decide to replace one unit, it might make sense to replace both simultaneously to save on costs and future hassle.
While different HVAC contractors might offer higher or lower prices than competitors, the best time to replace your HVAC system is when customer demand is low. The beginning of summer and the beginning of winter bring the most demand for HVAC systems, so if you can, consider replacing your HVAC units in the early spring or fall. Many HVAC companies offer special off-season coupons that help lower the overall cost.
The average cost to hire an HVAC contractor is between $50 and $150 per hour if charging hourly. However, some HVAC contractors will charge a flat fee by the type of service they are performing—for example, an inspection can cost between $150 to $500. Keep in mind that emergency repairs—which are made after business hours or around major holidays—generally cost more than scheduled repairs.
Yes, most states require HVAC technicians to be certified, and for good reason. Hiring an unlicensed HVAC technician could lead to poor quality work, costly future expenses, and potential code violations.
As you browse our pro listings, take note of the “Angi Approved” badge. Angi Approved businesses meet our standards for certification which include:
The owner, principal, or relevant manager passed a criminal background check
Required to have applicable state and local licenses
Maintain an average star rating of 3.0 or better on our network, if they have at least one review
Paying to advertise their services
Meeting any other eligibility criteria required by Angi
Keep in mind licensing is different from certifications. A license is a legal requirement to operate a business, while certifications are voluntary.
The average cost of HVAC repairs is around $350. However, that price can be as low as $100 or as high as $2,000 or more, depending on the repair. For example, replacing a capacitor is a relatively inexpensive repair, ranging from $100 to $500. However, a compressor repair is a more expensive repair, ranging from $750 to $2,000.
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