HVAC Services in Mount Vernon, IL

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One Hour Heating & Air Conditioning® Serving Mount Vernon

4.84

(160265 reviews)

One Hour Heating & Air Conditioning® provides year-round heating and cooling in Mount Vernon, IL, to keep your home comfortable through every season. Whether you're dealing with an aging furnace or a failing AC unit, we’re ready to step in with the fast, dependable service you expect. Our team shows up on time, prepared to fix the problem without wasting your day. We handle everything from routine maintenance to emergency HVAC service when your system quits unexpectedly. You can also rely on us for a full range of heating and cooling services including repairs, replacements, and tune-ups. We work hard to keep your system running strong so you can avoid surprises and stay comfortable, no matter the weather outside. When your system breaks down, contact One Hour Heating & Air Conditioning® for heating and AC services in Mount Vernon.

Licensed Technicians,Certified HVAC Service

Our technicians are fully licensed and certified in Illinois, so you can trust the work done in your home meets all state standards. We stay current with training and local codes to deliver safe, accurate service every time. Whether it’s a quick repair or a full system replacement, your HVAC project is in qualified hands from start to finish.

Why Do Homeowners Choose One Hour Heating and Cooling®?

StraightForward Pricing® Guide: We review your options with you before any work begins, so you’ll know exactly what to expect. No surprises, no hidden charges—just clear, honest pricing.
Always On Time... Or You Don’t Pay a Dime!®: Your time matters. We guarantee to arrive within the scheduled window, or your service is on us.
‘Round the Clock Availability: Emergencies don’t follow a schedule. That’s why One Hour® is ready to respond day or night whenever your system fails.
100% Satisfaction Guarantee: We stand by our work. If you’re not satisfied, neither are we. We back our service, parts, and labor for up to two years.
A Strict Code of Ethic: We treat your home and time with respect, always following our ethical standards and relying on courteous, trained professionals to serve you.

Your One-Stop HVAC Company for Heating and Cooling in Mount Vernon

We handle every part of your HVAC system. Repairs, maintenance, system replacements, and air quality checks are all covered in one visit. You won’t need to call multiple contractors or manage separate appointments. Our team does the work from start to finish with skill and precision. You get complete service designed to keep your home comfortable in every season.

Our Complete Line of AC Services in Mount Vernon Includes:

We Serve Homeowners Throughout the Entire Mount Vernon Area

Mount Vernon’s humid summers and freezing winters put constant stress on your HVAC system. Sudden temperature swings can wear down parts faster and reduce performance. One Hour Heating & Air Conditioning® stays ahead of the weather by offering seasonal tune-ups, prompt repairs, and expert system checks. We keep your equipment ready to handle the extreme conditions that come with Southern Illinois.

You Can Find Us All Over Mount Vernon, Including:

East side
North side
South side

FAQs

Have questions about HVAC service in Mount Vernon? We’ve answered the most common ones below to help you understand what to expect. Whether you're planning or dealing with an urgent issue, you’ll find clear, helpful answers right here.

What HVAC Services Do You Offer in Mount Vernon, IL?

We handle repairs, replacements, tune-ups, and full system installations for both heating and cooling. You can also count on us for air quality services and emergency HVAC support. Every job is backed by licensed Illinois technicians and our satisfaction guarantee.

How Often Should I Schedule HVAC Maintenance for My Mount Vernon Home?

We recommend scheduling maintenance twice a year—once in the spring for your AC and once in the fall for your furnace. Regular tune-ups help extend the life of your system and catch small issues before they become major problems. Seasonal service also keeps energy bills lower by maintaining peak efficiency.

How Do I Know When My AC Should Be Repaired or Replaced?

If your AC needs frequent repairs, struggles to cool your home, or is over 10 years old, it may be time to replace it. Rising energy bills and uneven temperatures are also warning signs. We’ll inspect your system and give honest guidance based on what’s best for your home.

Get Efficient Heating and Cooling Service Today

Don’t wait for your system to break down when the weather turns. Call One Hour Heating & Air Conditioning® in Mount Vernon for trusted service backed by certified local technicians. Whether you need a quick fix or a full system upgrade, we’re ready to help. Book your appointment today and take the stress out of heating and cooling your home. Fill out our online form or call One Hour Heating & Air Conditioning® for reliable emergency HVAC service in Mount Vernon.

We Have a Reputation

For Being Punctual, Friendly and Knowledgeable

4.84

(160265 reviews)

Mallory Vivar

in the last week

“Had to reach out to an A/C company, had no idea who to choose but took a chance on One Hour Ac & Heat. Came out to our house at 1am, got us fixed up and signed up for yearly maintenance. Professional all the way around. Thank you so much! Highly recommended!!”

Adria Thomas

in the last week

“Brian did a great job. He was very professional and knowledgeable of his job. I had an appointment for a couple of days later. He called me the next morning saying he was coming that day to repair my a/c and I appreciate it because my house was hot. Brian did a great job!”

SaKarsha SanchezHunter

in the last week

“Spencer provided outstanding HVAC service—he was patient, caring, and incredibly personable throughout the entire visit. He took the time to explain everything clearly, making sure I understood each step of the process. His professionalism and attention to detail were evident, and I truly appreciated how informative and thorough he was. Spencer went above and beyond to ensure I felt comfortable and confident in the work being done. It’s rare to find someone so knowledgeable and genuinely committed to excellent customer service. I highly recommend Spencer for anyone needing trustworthy, top-quality HVAC support.”

Nat Le Narvor

in the last week

“Yesterday, the issue was diagnosed. AC unit needed to be replaced. The team came this morning to install the new unit (inside and outside) and again, they were all very professional, did a great job. Very friendly technicians. They explained the difference between the new unit and the old and shared advice on how to best operate the AC. I highly recommend the service of this company! And my house is called again😃”

Jackie P

in the last week

“Great company! Reliable, responsive and incredibly knowledgeable. They were able to accommodate us same day, thoroughly explain the issue I was having and remediate quickly. Thank you so much for your expertise and professionalism!”

Vernon Fawcett

in the last week

“Nick was amazing. He completed the requested service and also provided some recommendations that we appreciated. Nick was thorough and we're very pleased with the work that was completed today.”

Saundra Middleton

in the last week

“I am very pleased with this maintenance service I received from One Hour Air Conditioning The technician Roberto was very professional and pleasant. He called to let me know he was on his way greeted me at my door, also, he asked if I had any concerns or special needs for his visit. He went right to work cleaning my outdoor unit and also taking care of the unit in the garage Also had great suggestions regarding what type of filter to place in the unit. thank you, Roberto. we’ll see you again in three months.”

Michael Puglise

in the last week

“I actually had One Hour do some work last year and they were out again this year. I really appreciate the fact I can call these guys and they'll show up the same day. That really helps, especially in this Texas heat. I had the same technician, Brent, nearly exactly a year later. He's patient, answers any questions I have, gives me tips on how to maintain the system and got me back up and running. I'll keep coming back here for my HVAC needs because I can depend on them. Im giving the 5 star specifically for Brent. I appreciate the business model and always getting there in a timely manner, their costs are just higher than most others.”

Keith Maholic

in the last week

“Anthony Romero Came out to my Home and it was very nice to have a service tech explain everything that he was checking and doing. Explaining what was wrong and how the service plans that were available and how they worked. Tony was very efficient he had the Blower motor replaced within a hour after he showed up very quick and would highly recommend him and Mitchell Heating and Air Conditioning Service.”

Bret Martin

in the last week

“Davis was amazing. Knew what was going on as soon as o told him. He was very professional and did not try to sell me stuff that I did not need. Will go back again if and when I need too.”