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.

Bringing Comfort Home

With Expert AC Services

One Hour Heating & Air Conditioning® of Greenwood

4.9

(1028 reviews)

Heating & Air Conditioning

Services By One Hour

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HVAC Repair, Installation & Maintenance

Heating, AC & Furnace Repairs in Greenwood, SC

When homeowners want a reliable heating or air conditioning system that they don’t have to think about, they call One Hour Heating & Air Conditioning. We are the premier HVAC service provider in the United States for a simple reason: we actually care about your comfort.

At One Hour, we respect you, we respect your time, and, most importantly, we respect the trust that you put in us to keep your home comfortable. It’s why we back all of our work with a 100% customer satisfaction guarantee for two years, and it’s why we’re always on time—guaranteed.

We Have a Reputation

For Being Punctual, Friendly and Knowledgeable

4.9

(1028 reviews)

Alan Thomas Sturm

06-15-2025

“Mr. O'Brian did splendid work. He was able to quickly and precisely diagnose the problem with my unit and report to me the findings. As in any good technician, he allowed me to decide weather to proceed fixing the primary problem as well as any additional problems such as low freon levels. The cost was very reasonable and expected, as I have had One Hour as well as Mr. OBrian repair heating and air problems in the past. Thanks again.”

Alan & Debbie Fountain

06-13-2025

“They were very accommodating with our needs. Prompt service and very helpful! We had a tree fall on our AC unit and damaged it. The insurance company needed an estimate and they were here the very next day, right on time!”

David Smith

06-11-2025

“Came out and assessed the problem and had everything fixed and running in an hour. Great job.”

John Collins

06-02-2025

“Robbie provided excellent service and knowledge on the issue I had with our system. He explained the options which made our decision easier.”

Edith Martin

05-28-2025

“He is very good I know of his work for several years I recommended him to my daughter. She is impressed with him also.”

Joshua Wicker

05-27-2025

“Great service! Took time to explain things in detail and laid out our options clearly. AC is working great.”

TONY LING

05-27-2025

“The caliber of talent that this company hires and retains is truly impressive. Heyward (like everyone else on their team) was punctual, courteous, and professional. My HVAC continues to run flawlessly with proper maintenance from this company”

robert mccann

05-27-2025

“Personable, knowledgeable, Efficient and Courteous.”

Debra Gamble

05-25-2025

“Excellent customer service. They said they would try come out doing their busy schedule and they did. I was very pleased Dayton. Thank you Drayton. He was very knowledgeable and helpful and courteous and respectful. Covered his shoes with no problem. He got my system back running. I’m very happy to recommend this company to family l, friends and neighbors. I thought the price was reasonable also, considering it was Memorial Day Weekend. One Hour Thank you.”

Tammy Keesee

05-23-2025

“Pleasant and professional.”

Special Offers

Mention these discounts at time of service

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$50 Off Repair

Not valid with any other offers and not applicable on service fees. Must mention offer at time of purchase.
Free Second Opinions

Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Management reserves the right to modify offers at any given time. Some restrictions 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 to us. While we carry the One Hour name, were an independently owned and operated business with a personal investment in the local community. We back our work with a 100% satisfaction guarantee, provide StraightForward® pricing guides for your benefit, and will pay you back for being even one minute late to an appointment.

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 Greenwood Team

John Collins

Owner

John & Dianne Collins are the owners and take pride their company is “Nationally Known and Locally Owned” as they are natives of Greenwood, S.C. John has been in the heating and air industry for over 30 years. Venturing out into the plumbing industry in 2007 John brought Benjamin Franklin Plumbing to town. Dianne joined him in 1995 as Office Manager. Together they proudly present One Hour Heating and Air Conditioning™ and Benjamin Franklin Plumbing™.
Dianne Collins

Owner

John & Dianne Collins are the owners and take pride their company is “Nationally Known and Locally Owned” as they are natives of Greenwood, S.C. John has been in the heating and air industry for over 30 years. Venturing out into the plumbing industry in 2007 John brought Benjamin Franklin Plumbing to town. Dianne joined him in 1995 as Office Manager. Together they proudly present One Hour Heating and Air Conditioning™ and Benjamin Franklin Plumbing™.
Brad Scruggs

Service Technician

Brad Scruggs joined our One Hour Team in 2001 as a Service Technician with an electrical background. Brad & Deanna reside in Greenwood with their son Kaden. Brad keeps busy working in his yard. And when has a chance, the family enjoys camping, and many other outdoor activities.
Heyward Simmons

Service Technician

Early summer of 2021, we welcomed Heyward Simmons to our One Hour family. He lives in Greenwood with his sons. When not helping our team with your service and maintenance needs, he can be found enjoying the lake or nearby rivers with his family.
Leland Scruggs

Service Technician

Leland Scruggs has been in the heating and cooling business for over 24 years. We welcome him back to our family and are happy he is available to help take care of our customers. He resides in the Greenwood area. When he's not working, he enjoys hanging at the lake, hunting, and fishing.
Angie Zink

Accounting

Angie Zink joined our family in 1998 and handles majority of the bookkeeping and accounting. Angie resides in Chappells has 2 grown girls, Amber and Ashlyn who are both married to local guys. She can be found on the lake spending time with her family, which includes a grandson and granddaughter when she is not at the office. Angie is our Finance Expert and eager to assist customers with any questions or concerns. Angie wears many hats in our company from Accounting to Operations to Service Manager to Customer Service Rep.
Carrie McCall

Customer Service Representative

Carrie McCall works as our After-Hours CSR. She and husband John live in Spartanburg S.C. She helps take care of our clients in the after-hour times. Carrie is normally the one calling our customers to make sure they are home for their appointment the next day and the technicians have all the information needed to make begin a successful day.
Elizabeth Moody

Customer Service Representative

Elizabeth Moody joined our team summer of 2021. She is often the one you will talk to when you call our office, as she is one of our customer service representatives and dispatchers. She enjoys her spare time with her baby girl and family.
Chris Harrison

Installer and Service Technician

The summer of 2016, we welcomed Chris Harrison (also known as Fuzzy) to our family. He is helping install our heating and air conditioning systems and can also be found helping the plumbing team. He lives in Bradley with his 2 young sons and daughter. When not working, he enjoys his family time and from what we hear, he is an outstanding cook, and he is an avid go-kart racer.
Robbie O'Briant

Installer and Service Technician

July 2021, Robbie O'Briant joined our installation team. He also performs tune ups (maintenace calls) and helps prepare your system for the season. He and his wife, LeAnna reside in McCormick and have 3 young daughters.
Drayton Richey

Installer

Drayton Richey joined our installation team in the fall of 2021. He also performs tune ups (maintenance calls) and helps prepare your system for the season and can also be found helping with your plumbing needs. He enjoys fishing and hunting and spending time with his family and friends. He resides in McCormick, where he is renovating his house.
Montgomery Hegler

Installer

In the Spring of 2023, we welcome Montgomery Hegler, also known as Gummie. He is a part of our installation team and will be helping the One Hour side install your heating & cooling system. He resides in McCormick. When he is not helping with your HVAC needs, he enjoys hunting and fishing and spending time with friends and family.