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 Suffolk County

4.5

(205 reviews)

Heating & Air Conditioning

Services By One Hour

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HVAC Repair, Installation & Maintenance

Heating, AC & Furnace Repairs in Suffolk County, NY

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

4.5

(205 reviews)

kimberly nusio

07-09-2025

“Luis went above and beyond anything we could’ve anticipated. Even during a heat wave, Luis walked in smiling. He was kind, courteous, efficient and knowledgeable. Luis explained everything in detail and was patient with our questions. He is a wonderful professional to have working with you and should be commended greatly. Luis is the reason we will continue to use your company. Great job, Luis!!”

Lawton Squires

06-19-2025

“Luis arrived early on a planned two-day HVAC replacement of a 20 year old unit. He and his team completed the takedown and demo of the dead unit and compressor and replaced it with the new equipment, as promised. On the first sunny and 80° day of the season, our CAC was up and running by the early evening on this two day projected job. The old unit and debris was all carefully removed and carted away and our home was protected during all of the demolition and installation work. Another great job!”

Karen

06-12-2025

“WOW...Service with a smile! Joe is a great technition helping our A/C system run better! Professional, knowledgeable, very kind!”

Trista DeFalco

06-05-2025

“Jose identified the problem quickly and placed an order for the parts needed-Easy to work with extremely helpful”

Cindy Tietjen

05-02-2025

“Jose and Luis were beyond professional and did a quick and thorough job! Polite and friendly- even when crawling into very tight spaces. Worth the wait for the hepa filter- hopefully keeps house dust free”

janette payne

12-17-2024

“Luis was an absolute pleasure to deal with. He was kind, professional and efficient. He quickly diagnosed a quirky, simple issue with our heating system that we first feared would be a major expense. He only charged us the mandatory service visit fee. I would request him if you ever need work performed on your HVAC system.”

Keith Strassberg

07-12-2024

“Was available same day. Came right over, diagnosed and repaired. They were knowledgeable and reasonably priced. Will use them again!”

Mohakem “Mohakem” Khan

07-02-2024

“Good technicians; good service”

Thomas Milward

03-22-2024

“Great service”

Allison Boyd

02-07-2024

“The technicians explained everything, were on time and also very courteous.”

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.