What does the One Hour mean in your company name?

The 'One Hour' in our company name indicates our guarantee to be at your home in the predetermined window quoted when you set your appointment. If we do not show up within that window, your service call fee is waived. 1. Express Appointment: This is an appointment that is scheduled during a specified one-hour time slot. You are promised that a technician will arrive at your home within this one-hour time window. You will also receive a call when the technician is en route to your home. 2. Reserved Appointment: This is an appointment that is scheduled during a specified, two-hour time slot. You are promised that a technician will arrive at your home within this two-hour time window. You will also receive a call when the technician is en route to your home. 3. Standard Appointment: This is an appointment that is scheduled during a specified four-hour time slot. You are promised that a technician will arrive at your home within this four-hour time window. You will also receive a call when the technician is en route to your home. 4. Stand-By Appointment: This appointment is for overflow situations. This appointment will not have a specified time. You will receive a call when the technician is en route to your home. 5. Emergency Appointment: This appointment is for an unspecified time after normal business hours Monday – Saturday and all day on Sundays/Holidays. Calls are dispatched in the same order they are received. You will also receive a call when the technician is en route to your home.

Do you service emergencies after-hours?

Yes, we offer emergency services 24-hours a day, year-round.

How much will my service cost?

The size and complexity of your HVAC issue will determine the cost. Because our trained, licensed HVAC technicians must diagnose the issue before we are able to quote you an accurate cost, we require an appointment to be set to complete a diagnostic on your system. Once the diagnostic is complete, your One Hour(R) technician will walk you through all costs using our Straightforward Pricing(R) Guide so there are never any surprise fees.

How often should I service my HVAC system?

It's ideal to service your cooling system each spring and your heating system each fall to ensure you find small issues before they become big problems.

How often do I need to change my HVAC filter?

Your filter should be changed every one to three months, depending on conditions in your home and your region's climate.

Do you offer purchase financing?

We work built relationships with several lenders to ensure our customers are able to restore comfort in their homes. Ask your technician about your financing options.

What are the advantages of a smart Thermostat?

Smart thermostats learn a household's patterns and adjust heating and cooling according to when a home is occupied, give homeowners the ability to control the thermostat remotely, and enable homeowners to reduce their energy use, saving you money.

HVAC means Heating, Ventilation, and Air Conditioning. HVAC systems refer to air conditioners, furnaces, and any unit that cools indoor spaces during the summer and warm them in the winter. In general, an HVAC system takes in air, heats or cools that air, and blows it into a room or any indoor space. While many homes have separate air conditioning and heating units, others have a heat pump that cools and heats the house. Not only do HVAC systems maintain desired temperatures, but they also improve indoor air quality and regulate humidity levels. But most importantly, these units provide comfort all year round.

What is a SEER Rating?

The SEER (seasonal energy efficiency ratio) is a measure of the efficiency of your heating and cooling system.The higher the SEER rating, the more efficiently a unit operates. The SEER rating of any given unit can range anywhere from 13 to 21.

Let Us Make Your Home

With Expert AC Services

One Hour Heating & Air Conditioning®

4.9

(1794 reviews)

Heating & Air Conditioning

Services By One Hour

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HVAC Repair, Installation & Maintenance

Heating, AC & Furnace Repairs in St. Charles, IL

When St. Charles homeowners want a reliable, efficient heating or air conditioning system they don’t have to worry about, they call One Hour Heating & Air Conditioning®. One Hour is the premier HVAC service brand in the United States for a simple reason: We truly care about your comfort.

At One Hour Heating & Air Conditioning, we respect you and your time. It’s why we’re the most trusted local source for heating and cooling services. We’re so committed to arriving on time that we will pay you back for being even one minute late for your appointment!

We Have a Reputation

For Being Punctual, Friendly and Knowledgeable

4.9

(1794 reviews)

Dave Evans

07-04-2025

“my a/c died in a heat wave, and One Hour responded very quickly and sent Sean to repair the problem - he was pleasant, professional, and finished the job quickly. thank you and keep up the good work!”

Joanne Tyree

07-04-2025

“Jeff came out the evening of July 3 and got our a/c back up and running. Perfect!”

Teresita Difuntorum

07-02-2025

“Another suggestion to be change but I said still alright to next maintenance schedule , anyway might be giving more discount next time. Thanks and have a great day!”

Brian Bartler

07-02-2025

“Mark was great. On-time, very efficient, explained his recommendations in detail. Thx!!”

Jamie Farny

07-01-2025

“Piyush R arrived early in my time window. That was a big help. After he cleaned the outside system, he put the grate back in place and fixed the noise it was making earlier. Service was thorough and efficient. System is running great.”

Julie Yamaguchi

07-01-2025

“Great service! Jeff showed up on time (at the beginning of his arrival window), wore shoe coverings to protect my carpet from outside dirt (a big deal for me), checked my A/C, cleaned the outside of my unit, and let me know everything looked good. Given the recent hot weather, this was great to hear.”

Julie Graham

07-01-2025

“Technician was right on time, personable, and thorough. We will definitely work with this company again!”

Michael Ger

06-30-2025

“Jeff's service was professional, timely, and friendly. He provided good information about what to expect for future considerations.”

Melissa Hutchison

06-28-2025

“until after midnight before any real cooling took place. The humidity levels seemed too high. Jose immediately identified the issue and got to work rectifying the situation. He also showed us how to do some preventative maintenance that would ease the burden on our system. From the office scheduling through Jose’s visit we were thrilled with the fast, reliable service delivered by kind employees. We highly recommend One Hour Heating.”

Maureen Matheson

06-27-2025

“Ulises Hernandez from One Hour Heating and Air did d a wonderful job checking the AC unit. He was very professional and thorough and answered all our questions. He is a wonderful employee and we hope he is our representative for all future service calls”

Special Offers

Mention these discounts at time of service

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Free Service Call

Get a Complimentary Service Call with Completed Repair. This Is a $119 Value! (1st time clients)

Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Valid Only one per household, per lifetime.
$25 Off Any Repair

Receive $25 off any repair of $262 or more!

Not valid with any other offer. Must mention offer at time of purchase.
5% OFF

Military Discount

Valid at participating locations. Limit one coupon per household. Service fees may apply. Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Some restrictions, taxes, and fees may apply.
5% OFF

Senior Citizen Discount

Valid at participating locations. Limit one coupon per household. Service fees may apply. Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Some restrictions, taxes, and fees may apply.

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HVAC Services You Can Count On

Our customers love what we do because we treat them like the neighbors they are. While we carry the One Hour name, we are an independently owned and operated business with a personal investment in the local community. We back our work with a 100% satisfaction guarantee and provide StraightForward Pricing® so you know the fee in advance. Plus, our financing options make paying for necessary HVAC repairs and installations easier.

If you’d like us to handle all your current and future HVAC needs, consider joining our Club Membership. Once you sign up, we’ll perform a thorough tune-up and safety check for your HVAC system. You’ll also benefit from priority scheduling, discounts, regular in-depth inspections, and more!

Find out for yourself why customers love what we do by calling our St. Charles HVAC repair, installation, and maintenance team today!

Here For You

When You Need Us Most!

Yellow One Hour Heating & Air Conditioning service van with company branding and slogan.

'Round the Clock Availability

No matter the hour, you can trust One Hour to be there to help you when you get hit with the unexpected.
100% Satisfaction Guarantee

We guarantee our materials, labor, and craftsmanship for up to two years from the date of your service.
StraightForward Pricing® Guide

Before we start any work, we discuss your available options so you know exactly what you are getting and how much it will cost. No hidden fees!
Always On Time…Or You Don’t Pay A Dime!®

We understand your time is valuable, so we promise to arrive at your home within the predetermined time window that you select, or your service call is free.

0% Financing Available

Prioritize your comfort without fronting the entire bill on day 1 – contact us today to learn more about financing options.

Discover Your Options

Meet the Elk Grove Team

Bill W.

Owner

Bill W. is the respected owner of American Comfort’s One Hour. He was born and raised in the Chicago Suburbs, primarily Medinah. Bill grew up around the heating and air conditioning business and has been providing comfort for over 20 years. He has been married to his amazing and beautiful wife for over 20 years. He is a very proud father of his 2 beautiful daughters. Bill enjoys traveling abroad to explore new and exciting places. He especially loves flying his drone in his backyard to encourage the loitering geese to move on. When not spending time outdoors, Bill is collecting every gadget known to man. He is our resident gadget guru! He just has to have it!
Carl S.

Operations Manager

Carl S. is our dedicated operations manager. He was born and raised in the Chicago suburbs. Carl has been guiding people to their comfort zone for 19 years. He is married to his beautiful wife for 5 years and has 2 amazing young children. Carl is a grilling/smoking guru and the office staff has been known to participate in a few smoking cook-offs. When not enjoying watching his children experience the world, Carl is down for ANY reality tv show to be found. Keep your judgments to yourself, but bring on the DRAMA Bachelorette!!! He is ready!
Rick N

Warehouse Manager

RickÂ is our dedicated warehouse manager. He grew up in Streamwood and Hanover Park. Rick enjoys spending time with family and friends .With 4 kids, 7 grandkids and 1 great grand child, we are sure he is never bored!!!
Joe D

Installation Manager/Trainer

Joe D. is a one of our dedicated installation transformers. He was born and raised in Itasca. Joe has been installing comfort for people for over 33 years. He has been married for 25 beautiful years and has 2 amazing grown children. Joe enjoys spending quality time becoming one with nature while hiking and camping. If Joe is not venturing out into the great outdoors, you will find him relaxing in his favorite chair cheering on his favorite teams. Joe is a quiet and shy kind of guy, but wait til he gets to really know you!
Jeff B.

Service Technician

Jeff B. is one of our experienced and happy comfort geniuses. He was born and raised in Los Angeles. Jeff has 12 years of making customers comfortable and happy. He has been married for 12 awesome years and has 2 amazing children. On the weekends, you can find Jeff working to keep his yard beautiful, reading a good book or taking a walk with his beautiful wife. Jeff spent 7 years working HVAC in the hot city of Las Vegas before heading to the cold, cold winters of the Midwest, we wonder will he be able to keep that smile going during the bitter cold!
Jose G.

Service Technician

Jose G. is one of our experienced and friendly comfort geniuses. He was born in Mexico, but came to the US at 5 and is a proud American citizen. For 14 years, Jose has been keeping customers comfortable. He has been married for 17 beautiful years and has 3 amazing children. Jose is all about his beautiful family and spending time with them. Vacationing is a big part of their fun family time together, they especially love camping under the stars.
Piyush R

Service Technician

Plyush is one of our trusted Service Advisors. He was born in India and raised in the Chicago suburbs. He has been assisting customers with their comfort for 23 years. Plyush has been married for 11 wonderful years and has 2 young children. He enjoys spending quality time with his boys making amazing memories. On weekends, Plyush can be found racing his RC cars around town or flying his RC helicopters. He has a real NEED for SPEED!
Lisa C

Administrative Manager

Lisa Cajigas, born and raised in Chicago where she met her husband (Peter) of 32 years early in life and began raising a family. She is a mother to 3 adult children and a grandmother to 5 beautiful little ones. While raising a young family she made time to study accounting at Robert Morris College and has been in the finance/administrative field for nearly 30 years. Passionate about the youth and her community she is a volunteer religious education instructor as well as Sunday school teacher at St. Gertrudes Church. Lisa is an avid runner having logged countless miles, and participated in a number of half marathons over the past 5 years. Grateful for an amazing life’s journey Lisa is always ready to welcome new and exciting challenges with an open mind.
Ricardo G

HVAC Service Technician

Meet Ricardo, a West Chicago native with a year of experience in his field. He finds joy in weightlifting and rock wall climbing, pushing his limits both physically and mentally. Ricardo's free time is dedicated to reading and researching topics that captivate his interest. With a drive for personal growth and a thirst for knowledge, he is a dynamic individual leaving a lasting impact.
Brian J.

Client Care Representative

Brian J. is one of our happy and humorous customer service representatives. Brian has over 28 years experience making people happy. If you have ever spoken to Brian you would see why he says he is from a galaxy far, far away, but on earth he grew up in North Lake. He has been married for 11 amazing years and has a beautiful young daughter. On any given weekend, you can find Brian relaxing with his wife or searching for the best estate sale in the area. Brian is always ready to make a customer smile and laugh.
Mikilina

Client Care Representative

Mikilina is one of our valued Client Care Advisor. She was raised in a very small rural town in Illinois. She has been in customer service for over 20 years. Mikilina enjoys reading and playing with her dogs. As long as there is music playing, Mikilina is living her best life!

Michael S

Comfort Designer

Michael "Sully" Sullivan: A Comprehensive Biography** Michael Sullivan, affectionately known as "Sully," has dedicated the past 20 years to his career as a home consultant, where he has honed his expertise in helping clients create their dream living spaces. His commitment to excellence and customer satisfaction has made him a trusted name in the industry. Before embarking on his career in home consulting, Sully served his country with distinction as a Naval Aviator, achieving the rank of Lieutenant. His time in the Navy instilled in him values of discipline, leadership, and a steadfast work ethic, which he carries into his professional life. In his free time, Sully is an avid outdoorsman. He enjoys spending quality time with family and friends engaging in activities such as hiking, boating, and skiing. These adventures not only provide a refreshing break from his busy schedule but also allow him to create lasting memories with his loved ones. Additionally, Sully has a passion for gardening, finding peace and satisfaction in nurturing and cultivating his home garden. Sully has been happily married for 17 years and is the proud father of two wonderful children, ages 5 and 9. His family is the cornerstone of his life, providing him with endless joy and motivation. A little-known fact about Sully is a family lore that suggests a distant relation to the famous bare-knuckle boxer John L. Sullivan. Although he hasn't fact-checked this intriguing claim, it adds an interesting twist to his personal history. Sully grew up in the charming town of Darien, where he developed a love for the outdoors and a strong sense of community. This background has undoubtedly influenced his approach to both his personal and professional life, making him a well-rounded and relatable individual. Whether he's helping clients transform their homes, exploring nature, or enjoying time with his family, Sully approaches life with enthusiasm, integrity, and a deep sense of gratitude.

Mark M

Comfort Genius

Mark Martinez is a dedicated HVAC professional with a decade of experience in the industry. A Navy veteran, Mark brings a strong sense of discipline and commitment to his work, ensuring top-notch service and expertise in every project he undertakes. When he's not working, Mark enjoys unwinding with a good movie or exploring new trails on his bike. His passion for outdoor activities extends to his love for barbecuing, where he often experiments with new recipes and techniques. Single and without children, Mark values his free time and enjoys the simplicity and joy his hobbies bring to his life. With a strong work ethic and a zest for life, Mark Martinez exemplifies dedication both in his professional and personal endeavors.
Ulises

Comfort Genius

Ulises, a Schaumburg native, has immersed himself in the world of HVAC since 2019. Beyond his professional pursuits, Ulises finds solace and joy in various activities. When not tinkering with HVAC systems, he can be found reveling in the great outdoors. Whether it's a spirited game of soccer with friends, a serene kayak trip, or a refreshing swim, Ulises embraces nature's offerings wholeheartedly. A self-proclaimed PlayStation enthusiast and dedicated gamer, Ulises is known to lose himself in virtual worlds when not exploring the real one. He balances his love for gaming with an active lifestyle, frequently engaging in running and other physical activities to stay fit and energized. Family holds a special place in Ulises's heart, and he cherishes spending quality time with them whenever possible. While he doesn't have children of his own, his dog occupies a central role in his life, often being treated as his furry child. Beyond his known passions, Ulises harbors a hidden talent for home projects, relishing the satisfaction of creating and fixing things around the house. Furthermore, he aspires to deepen his connection to nature by embracing the life of an outdoorsman, honing skills in hunting, fishing, and sustainable living off the land. Ulises embodies a multifaceted individual, seamlessly blending his professional expertise with a diverse range of interests and hobbies, all while nurturing connections with loved ones and the natural world around him.
Sean A

Comfort Genius

Born in Melrose Park, IL, Sean Andersen spent his formative years moving between Naperville and Romeoville, where he developed a deep appreciation for nature and the outdoors. With a penchant for adventure, Sean found solace in exploring forests with his children, immersing himself in the beauty of the natural world. Professionally, Sean has dedicated himself to the HVAC industry for the past five years, applying his skills to ensure comfort and efficiency in every home he visits. His commitment to excellence and attention to detail have earned him a reputation as a trusted expert in his field. Outside of work, Sean's passions extend to the realm of gaming, where he finds joy in both digital and analog experiences. A skilled player of the Pokémon card game, Sean competes at a master-ranked level, showcasing his strategic prowess and love for the franchise. When he's not dueling opponents, you can find him engrossed in a captivating book, navigating virtual worlds in video games, or expressing his creativity through drawing. Family plays a central role in Sean's life, as he has been happily married for nine years and is the proud father of two boys, aged two and eight. Together, they embark on adventures, fostering a love for exploration and discovery in the next generation. In all aspects of his life, Sean approaches challenges with determination, passion, and a sense of adventure, making him a cherished member of both his family and professional community.
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