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 SEER2 Rating?

The SEER2 (seasonal energy efficiency ratio) is a measure of the efficiency of your heating and cooling system.The higher the SEER2 rating, the more efficiently a unit operates. The SEER2 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

(1336 reviews)

Heating & Air Conditioning

Services By One Hour

View More Services

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

(1336 reviews)

Deb Ratliff

a week ago

“Shout-Out to Alex Santana – One Hour Heating and Air Conditioning I want to give a big thank you to Alex Santana from One Hour Heating and Air Conditioning. He came out to our home on 07/01/2025 to check our air conditioning and did a fantastic job. Alex took the time to clearly explain what the issue might be and walked us through the possible solutions. His attention to detail was outstanding, and we truly appreciate his professionalism, insight, and willingness to help. Thank you, Alex, for your excellent service!”

markus k

in the last week

“David Brown performed our annual A/C system maintenance and did a fantastic job. He was very thorough, respectful of the property and answered any questions I had. He went above and beyond, and I asked him for his business card so I can request him for future service visits through One Hour Heating and Air Conditioning.”

Heather Lopez

a week ago

“Michael was very professional and extremely thorough when servicing our air condition units. He answered all my questions and was very kind and considerate. He did a great job. I will be requesting him again.”

Nicky

a month ago

“Josh was on time for the appointment, did a thorough job, and fixed the issue with my AC unit! The two hour appointment window was great and their membership program makes getting service easy and fast! Also they have 24/7 appointment scheduling by phone. All very convenient!”

Special Offers

Mention these discounts at time of service

View All

Annual Maintenance!

$99 AC Tune-Up, $89 Heater Tune-Up

Expires: 2025-07-31

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.
$2025 Off

Any New Furnace and AC System

Expires: 2025-07-31

Valid at participating locations. Limit one coupon per household. Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Some restrictions, taxes and fees may apply.
$100 Off Any Service

For Every $1000 Spent

Expires: 2025-07-31

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

with Any HVAC Service

Expires: 2025-07-31

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

When you Upgrade Your IAQ System

Expires: 2025-07-31

Valid at participating locations. Limit one coupon per household. Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Some restrictions, taxes and fees may apply.
$100 Off

Oxy Quantum LED UV Lights and Whole-Home Filtration Systems

Expires: 2025-07-31

Valid at participating locations. Limit one coupon per household. Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Some restrictions, taxes and fees may apply.
No Service Fee

With Completion of Repair!

If no repair is made, service fee may apply. Limit one coupon per household at participating locations!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.

View All

HVAC Services You Can Count On

Denver HVAC Services Have Great Guarantees

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 Denver 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

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.