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 Annapolis

4.8

(322 reviews)

Heating & Air Conditioning

Services By One Hour

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

HVAC Repair, Installation & Maintenance

Heating, AC & Furnace Repairs in Annapolis, MD

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

4.8

(322 reviews)

Kristen Phaup

03-29-2025

“Easy to work with and patient with questions.”

Patrick Upman

03-27-2025

“Friendly and professional. Educated me on how to service my boiler and what look for in the future as well as options to consider when the time comes to replace.”

William Evans

03-19-2025

“I had work done on my heat pump today and I had an ionizer installed. Steve is an excellent and very knowledgeable technician. He walked me through everything that was done. He answered any questions I had and made sure I saw all before and after work. I would recommend all friends to One Hour Air. I've been using this company for 13 years.”

Lisa Lutz

03-19-2025

“Stephen did our spring maintenance today. Very thorough job. Thank you.”

Jeffrey Cranska

03-18-2025

“Thorough air conditioner inspection and tune up Took time and explained service”

I.P. Daily

03-15-2025

“As usual, great service from Mr. Shawn. Very polite and professional. Had a one-year-old napping while he first arrived, and he was well aware of the quiet situation that was needed. Completed his job and the baby slept through the whole process.”

Marusia Zearfoss

03-14-2025

“I could not have asked for a more professional, thorough, or considerate person to work with. Allan did not hesitate to let me know what I didn't need while he explained the pro's and con's of various choices. He was a pleasure to work with.”

D Brown

03-11-2025

“Everything went perfectly. Shawn was very punctual, professional and very courteous. He respected my home by putting on those booties and I really appreciated that. I didn’t even have to ask him. He went over our heating system top to bottom, explaining everything to me, even changing the filter for us. Shaun was also able to give me an estimate for cleaning our vents, something I wasn’t aware One Hour did. Now I know. Thanks Shaun for taking care of our system for us today. D. Brown”

Ladye (LadyE)

03-07-2025

“My HVAC stopped working yesterday and due to its age I knew it would require replacement. Mr.Powell performed a review of my current system and gave me a tutorial about my current system and several options for the replacement. I loved the fact that he took the time to explain how the systems work and to suggest replacement systems that will support my requirements. Mr. Powell was very professional, friendly and knowledgeable. It was a joy working with him. I highly recommend One Hour Air Conditioning and Mr. Powell.”

Special Offers

Mention at time of service

$100 Off

Any Service for Veterans, Active Military First

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.
$249 Off Duct Cleaning

New Club Member Offer

Expires: 2025-03-31

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’re 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.