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 Johnson County

4.9

(2867 reviews)

Heating & Air Conditioning

Services By One Hour

View More Services

HVAC Repair, Installation & Maintenance

Heating, AC & Furnace Repairs in Johnson County, KS

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

(2867 reviews)

Darren (kchometheater)

06-25-2025

“Tristan, and EVERY other Certified Tech we have welcomed into our home have been extremely professional in explaining troubleshooting, diagnostics and repair. We have been on their Service Plan for years! 100% worth it, investing in a new AC unit ain’t cheap and they have kept our 27 year old unit in maximum condition so I have no doubt that their service is directly related to it’s productive life! One thing, One Hour please up date Tristan’s bio… he is now the father of TWO children! ;)”

Mike Wilhite

06-25-2025

“The technician was professional, pleasant and friendly. He diagnosed thing quickly and made the necessary repairs. I really liked him and his work”

Esther Wafula

06-24-2025

“Dillon was awesome! Very nice and professional. He was able to tell us everything and lay out a perfect plan for us that was comfortable and within our budget. Thank you!”

Caleb Tady

06-24-2025

“Super nice, super fast, super knowledgeable, and let me know he was on his way out at 6am. Great service”

Cam Sommers

06-23-2025

“My AC went out on a very hot day. They came out super quick. Assessed what was wrong quickly and gave me all of my options with ZERO pressure or any upselling. Very professional and reasonably priced.”

Debbie Shumate

06-23-2025

“Scott is the best he was very knowledgeable and very patient with us and went over in details great guy love this company”

Adam Steury

06-23-2025

“Technician was very polite and very detailed.”

flyby9998

06-22-2025

“Sam Criss is a phenomenal asset to One Hour Olathe. He's polite, kind, smart, knows his stuff and able to get to the point with a smile. He listened to my concerns and not only addressed them all but came up with a game plan to avoid issues in the future. He addressed any confusion I had and looked me straight in the eyes when doing it. That level of professionalism is rare these days. Whatever they're paying him is certainly not enough. Customer for life!”

Stan Haddock

06-22-2025

“Javier was excellent would request him for any other services”

Jason Allen

06-22-2025

“Francisco was excellent very detailed and very knowledgeable”

Special Offers

Mention these discounts at time of service

View All

Free Service Call

for First-Time Customer

If we have never serviced your home before and your equipment is not working and you would like us to come out to diagnose the reason why, either book your service online or call us and there will be no charge for that visit.

All you will have to do is show the technician the coupon on your phone if you book online, or mention this coupon when calling in to make the appointment.

View All

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 Straight Forward 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.