How long does furnace installation take?

Most furnace installations in Dunwoody homes are completed in one day. The crew removes the old furnace, installs the new one, connects everything, and tests the system before leaving. If additional work is needed — like ductwork modifications — it may take slightly longer.

What type of furnace is best for Dunwoody homes?

Gas furnaces are the most common choice in Dunwoody and provide reliable, efficient heat. High-efficiency models are a good investment because they use less fuel to produce the same amount of heat. A technician can recommend the best option based on your home's size and heating needs.

Do I need to replace my furnace and AC at the same time?

Not necessarily, but it's often recommended if both systems are aging. When the furnace and AC are matched, they work together more efficiently. If you're replacing just the furnace and your Dunwoody home's AC is still in good shape, that's perfectly fine.

Will a new furnace work with my existing thermostat?

Most modern furnaces work with standard thermostats, but some advanced features may require an upgraded thermostat. If you have an older thermostat, the installation is a good time to upgrade. The technician can advise on compatibility and install a new thermostat if needed.

How do I know what size furnace I need?

The right furnace size depends on your Dunwoody home's square footage, insulation, window area, and layout. A technician performs a heating assessment to determine the proper size. An oversized or undersized furnace causes comfort problems and wastes energy.

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Furnace Installation in Dunwoody, GA

One Hour Heating & Air Conditioning® of North Atlanta

Furnace Installation in Dunwoody, GA

Furnace installation in Dunwoody gives your home a reliable heating system that keeps every room comfortable during the cooler months. Whether your current furnace has finally given out or you're upgrading as part of a home renovation, a new furnace makes a noticeable difference in comfort and efficiency.

When It's Time for a New Furnace in Dunwoody

Many Dunwoody homeowners replace their furnace when the cost of repairs starts adding up or when the system simply can't keep the house comfortable anymore. Homes in neighborhoods like Redfield, Dunwoody Club, and Winters Chapel that were built in the 1970s and 1980s may be on their second or even third furnace, and the current one may be nearing the end of its useful life. If your furnace takes a long time to heat the house, makes loud noises during operation, or has had multiple repairs in recent years, replacement is worth considering. A new furnace is also a smart addition when you're renovating — upgrading the heating system at the same time saves the hassle of doing it separately later.

Choosing the Right Furnace for Your Home

The right furnace for your Dunwoody home depends on the size of the house, the existing ductwork, and your heating preferences. Gas furnaces are the most common choice in the area and provide strong, consistent heat. High-efficiency models extract more heat from the same amount of fuel, which means lower heating bills. The furnace needs to be properly sized for your home — too small and it won't keep up, too large and it cycles on and off too frequently. A technician evaluates your home and recommends the right size and type to match your needs.

What Furnace Installation Includes

Professional furnace installation in Dunwoody covers everything from removing the old unit to starting up the new one. The installation crew disconnects and removes the existing furnace, positions the new unit, connects gas lines and electrical wiring, hooks up the ductwork, and tests the system to make sure it's heating properly and operating safely. The technician also verifies that the thermostat is communicating correctly with the new furnace and that all safety controls are working. Before they leave, the crew walks you through the new system so you know how it works and what to expect.

About Dunwoody

Dunwoody has become one of North Atlanta's most active renovation markets, with homeowners investing in kitchen remodels, additions, and whole-home updates that bring older properties up to modern standards. Many of these renovation projects include HVAC upgrades, since the heating and cooling system in a 1970s-era home often needs to be updated alongside the rest of the house. The city's mix of original homes and renovated properties gives Dunwoody its character — and keeps HVAC professionals busy with both repairs and new installations.

Serving Dunwoody and Surrounding Areas

Our furnace installation service covers Dunwoody and surrounding communities including Sandy Springs, Brookhaven, Chamblee, Doraville, Roswell, and Johns Creek. We serve homeowners throughout the Perimeter area and North Atlanta.

Call (404) 689-4168 to schedule service.

Visit our office:

One Hour Heating & Air Conditioning
1360 Union Hill Rd Ste 5F, Alpharetta, GA 30004
(404) 689-4168
Open 24 hours

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Excellent service

Helen Albanese

in the last week

We had central AC added to our home 5 years ago. We decided to get an AC and furnace tune up before the summer. Matt, the technician from One Hour Heating and Air, was on time and polite. He pointed out that our furnace filter had not been changed since 2022. Big oversight by me. Matt explained how the air flows through the furnace and the direction the filter needs to be placed. I marked with a sharpie on the furnace an arrow so I would remember next time. Good piece of mind. Positive experience.

Justin Low

in the last week

I cannot recommend this HVAC company enough. The technician showed up exactly on time and was patient throughout the entire visit. They took the time to answer every single one of my questions thoroughly, making sure I felt completely comfortable with the process. What I appreciated most was their honesty—they gave me several clearly explained options for both repairing my current unit and replacing it. Best of all, they were not pushy and never once tried to upsell me on things I didn't need. It is rare to find such genuine, reliable, and pressure-free service these days. A 5-star experience from start to finish.

Paul Yi

in the last week

Best HVAC team in King County. Professional, reliable, and honest. Alex, the owner, takes great care of his customers. Highly recommend.

Denis

in the last week

I was initially skeptical of working with a franchise, but I was really impressed by how professional, helpful, and punctual their technician, Matthew, was throughout the visit. Pricing was reasonable and I will definitely be going with them for any future HVAC needs.

Max B

a week ago

Really good experience with One Hour. Alex was super communicative from the first call, got us on the schedule quickly and kept us in the loop the whole time. Marklus came out and handled the repair. Technically solid and left everything cleaner than he found it. Never felt pressured to buy anything extra which was refreshing.

vivek savsani

a week ago

We had our heating system stop working during the extreme snow storm, and this company responded quickly. Joe Bonness, who is an expert technician arrived on time, diagnosed the issue fast, and fixed it efficiently. He explained everything clearly and made sure the heat was working perfectly before leaving, even though it was late around midnight. We are very grateful for the quick and professional service during such freezing weather. Highly recommend their service!

Neha

a month ago

Huge thanks to my neighbor Chris for coming over late at night to fix my AC unit when it stopped working. I caught him and his family on the way out and told him my problem. He ended up leaving his plans early and took the time to figure it out and got it running again quickly. It meant a lot that he was willing to help out so late. He even gave me a few tips to look out for in case anything else happened. Super knowledgeable and a great neighbor to have! Give that guy a raise!!

Zaria Smith

a month ago

Tim was great. I can’t say enough good things. He came out to do a routine maintenance and unfortunately, I had to replace my furnace due to wear and tear. This happened on Friday, and he was at my house bright and early Monday to install the new furnace. He was pleasant the entire time, and very informative throughout. Thank you so much.

Sindel Garcia

a month ago

I will start by saying that KC was very professional explaining all aspects of the whole job that his team was going to do as far as to what we needed concerning a furnace rather we should repair or replace the existing furnace which by the way was 26 years old. Zo the service installer was quite thorough with the entire job, also Areej another technician did a spectacular job with cleaning all of the air ducts with detailing each step of the way up to and including the dryer vent as well a fantastic job was done. Although the job was extended one extra day was not a problem the problem came about when they informed us that they were going to return the next morning by 10am and by 11am we hadn't heard from them when a simple courtesy call with an eta would have gone a long way instead of me having to place a call to them. Overall the job was complete with a new furnace that was installed and the job was well done.p I would highly recommend One Hour Heating & Air Conditioning of Naperville.

Gerald Moody

a month ago

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