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 Denver

4.7

(1148 reviews)

Heating & Air Conditioning

Services By One Hour

View More Services

Two One Hour Heating & Air Conditioning technicians standing confidently in front of a service van.

HVAC Repair, Installation & Maintenance

Heating, AC & Furnace Repairs in Denver, CO

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 Knowledgable

4.7

(1148 reviews)

MICHAEL JANTSCHI

4 weeks ago

“Jasmine was very thorough, polite, and professional with the maintenance checks of our furnace. She provided options to restore our furnace closer to its' original efficiency. She conducted a detailed evaluation of our home to determine furnace and our 10 year old air conditioning replacement options. After she completely explained all of the purchasing options she provided a quote with discounts. She answered all of my questions and gave me plenty of time to make a decision. I decided to purchase a new furnace and air conditioning system. Jasmine arranged to have these installed within 2 days!!! This is why I am a long time customer of One Hour Heating & Air Conditioning.”

Bill Buck

a month ago

“I want to give a big thank you to Brody Sheridan. He was awesome. He had to come out multiple times because we had multiple issues on an old heater- and he was absolutely fantastic. His attitude, high level of Customer Service, and willingness to go the extra mile was the best experience I’ve had since moving to Colorado. I want to say that in will definitely be using you guys again and requesting Brody for any issues we may have. He as absolutely the best and you now have a customer for life because of him.”

Jan Young

a week ago

“Furnace tune up went smoothly. Michael did a great review of things that would be good to do for Furnace efficiency inthe future. We reviewed all the things he did and observed. I would be glad to have him back any time I need more work done.”

Shannon Baron

3 weeks ago

“The crew thar was sent to my home was polite, professional & efficient. They arrived early & completed the work in a timely manner. We are very satisfied & would definitely recommend One hour to others! Shout out to Ivan for his honesty & professionalism. He completed all the maintenance on our furnace & he did all the work necessary & cleaned everything that was required. in the past, other techs had not done the work they were supposed to yet, ensured us they did. I'm pleased that the company is hiring workers like him & getting rid of the ones who are dishonest!”

MICHAEL JANTSCHI

2 weeks ago

“Dean Liscum was the technician who came to our house to replace a programmable thermostat with another version which fit in very well with our color scheme. He was meticulous in making certain that every step in the setup ensured that every function worked as expected and matched my wishes. There were A LOT of steps involved! Dean carefully checked and rechecked until he was certain that all of the new thermostat settings were working. He even spent time to complete the 7 day program setup for me. Dean made sure that all of my questions were answered. He was patient, professional and clearly highly skilled in his work. Dean is the latest example of the good people that I have come to know from this company. I am pleased to highly recommend this company and their people to everyone who wants the best in Heating & Air Conditioning.”

Special Offers

Mention at time of service

$2025 Off

Any New Furnace or AC System

Expires: 2025-04-30
$100 Off Any Service

For Every $1000 Spent

Expires: 2025-04-30
FREE Indoor Air Quality Assessment

with Any HVAC Service

Expires: 2025-04-06
Get a Discounted Duct Cleaning

When you Upgrade Your IAQ System

Expires: 2025-04-06
$100 Off

Oxy Quantum LED UV Lights and Whole-Home Filtration Systems

Expires: 2025-04-06
$99 Heater Tune-Up

Expires: 2025-03-31
No Service Fee

With Completion of Repair!

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, 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, 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 Denver Team

Cory Clinton

VP of Operations

As VP of Colorado Operations, Cory oversees One Hour Heating and Air Conditioning, Mister Sparky Electrical and Benjamin Franklin Plumbing in Loveland and Denver. While that’s a lot to do, he and his team are handling it all well – they’ve been honored with 2009 Franchise of the Year, 2010 Employer of Choice Award for Retail, and 2012 and 2014 Division of the Year awards.

Cory has been in the industry for 14 years and believes that the stability of the franchise and income potential are two good reasons for getting into skilled trades with the company. Cory is a California native who married his high school sweetheart and is raising his two children in Loveland.
Ashley Forgacs

Operations Manager

Ashley Forgacs, based in Loveland, CO, started her career in personal training and retail management. Intrigued by the home services trades' relevance and demand, she joined One Hour Heating and Air Conditioning of Colorado as a Customer Service Representative in 2012. Now, as Operations Manager, Ashley is passionate about creating a strong company culture and providing development opportunities for employees at all levels. She is proud to offer the best warranties and guarantees behind our services, and instills in her team that communication is the key to quality customer service. Ashley lives with her husband of three years (her high-school sweetheart), young son, two dogs, and two cats. Outside of work, she takes advantage of Colorado's outdoors by skiing, camping, and paddle boarding, as well as supporting local charities Realities for Children and River’s Promise.