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Find Furnace / forced air heating system install or replace pros in Key Largo

Avatar for One Hour Air Conditioning & Heating of Miami
One Hour Air Conditioning & Heating of Miami
4.4(
13
)
Thermostat - Install or ReplaceThermostat - Repair or Reprogram

Serving Key Largo, FL and surrounding areas

Approved

In business since 1987

Emergency services offered

Warranties offered

For over a decade, One Hour Air Conditioning & Heating has been a trusted leader in HVAC services. Our mission is simple: deliver reliable, high-quality, and timely HVAC solutions with customer satisfaction at the core. Proudly serving Florida and Birmingham, Alabama, our expert technicians specialize in AC repairs, installations, replacements, and heating system maintenance.\nWe prioritize your comfort with fully stocked service vehicles, ensuring most issues are resolved on the first visit. Our licensed, insured technicians undergo rigorous training, background checks, and drug screenings for your peace of mind.\nAs we expand, we remain committed to excellence, bringing top-tier expertise to more homes. Need HVAC service? Contact us today. And remember, One Hour is always on time- or you do not pay a dime!\n

Testing Outdoor Unit
Testing Outdoor Unit
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+7

25 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for A-Max Air Conditioning Inc
A-Max Air Conditioning Inc
4.7(
591
)
Electric Furnace / Forced Air Heating System - InstallElectric Furnace / Forced Air Heating System - RepairGas Furnace / Forced Air Heating System - Install+4 more

Serving Key Largo, FL and surrounding areas

In business since 2004

Free estimates

Emergency services offered

"They arrived on time, then troubleshot the issue that I have, extremely courteous and professional. They repaired my AC system and did a checkup at the same time; replaced a faulty part, which they have in the truck, which means that there is no ordering and waiting. I will definitely call them again in the future."
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Recommended by94%of homeowners
Avatar for Centry Air Designs
Centry Air Designs
4.9(
14
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+43 more

Serving Key Largo, FL and surrounding areas

In business since 1986

Free estimates

Emergency services offered

"I was not sure what was wrong so I called these guys, described what I knew, and they said they would come look at it. They said there was an $85 minimum charge for an assessment but that it would be credited toward any kind of services and equipment that I needed. They showed up within 2 hours and even called me ahead of time to double check that I would be there. Once they arrived they checked several things before opening up the unit and then showed me where the electrical part of the system had melted, likely due to a power surge. So it had to be replaced, but they said they could replace the whole system (inside, outside and thermostat) that day. They even got a crane because the outdoor unit is on the roof of my condo unit. The techs were all quick, polite and respectful. They also helped provide photos and documentation should we need to submit a claim to the homeowners insurance company. I would highly recommend them and would use them again in a heartbeat. Big thanks to Alex Rodriguez and his team."
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+8

Recommended by100%of homeowners
Hallmarc, Inc.
5.0(
5
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+43 more

Serving Key Largo, FL and surrounding areas

In business since 2006

Free estimates

Emergency services offered

"Amazing technical expertise and physical strength displayed by Mr. Hall who got the water heater to second floor by himself and safely installed my brand new unit. He's also maintained my AC for the last 7 years and recently replaced my thermostat. He is also knowledgeable and able to make electrical repairs and wiring. He is also an honest person who will advise you accordingly."
Water Heater Install
Insulation
Insulation
Recommended by100%of homeowners
Core Mechanical
4.4(
28
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+43 more

Serving Key Largo, FL and surrounding areas

In business since 2004

Emergency services offered

Credit card accepted

"A year ago they responded to an SOS related to a full A/C failure. They were prompt and professional. It took several days, in the heat of the summer, till they were able to fix it, but they had to get a part from the west coast so we sweated through the ordeal. While they were working on replacing the main board, I also engaged them to clean the system. I thought the charge was high ($1000), but needed it done. A year later, one of the A/C mini-split heads stopped working. They came the next day. I paid $200 for them to trouble shoot it, which took approximately 20 minutes. (Subsequently another A/C service charged me only $95 to trouble shoot!) They said they would order the part and get back to me. After I week, I had not heard from them. When I called they said they could get the part but it would take 4-6 weeks. I said okay. What could I say. I left it in their trustworthy hands. After 6 weeks I heard nothing from them. I called. I left 4 messages, which were all unreturned. On the 5th try, someone answered. He said he couldn't get the part. Would have been nice to know that 5 weeks ago. Still puzzled why they didn't communicate with me and thus the low review. I have to say that I thought they were really nice people, but obviously my business wasn't that important to them. So be it. But a little courtesy and honesty would go a long way when servicing a small community like Key West. Because of the later incident, I wanted to give them an F, but that wouldn't be fair. If you're lucky, have deep pockets, and the problem isn't complicated, they are okay. Just be aware. I thought I had actually found a reliable service, but that wasn't the case."
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Recommended by87%of homeowners
Avatar for Paramount Home Technologies
Paramount Home Technologies
4.1(
85
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+43 more

Serving Key Largo, FL and surrounding areas

In business since 1980

Free estimates

Emergency services offered

"We LOVE the system!  The cabinetry came out perfect and my husband loves his remote control and surround sound and i can actually operate everything which is a miracle on its own!    When people walk into our home they all comment on how beautiful our unit looks and we recommend them to all of our friends and neighbors.  The owner Seth was a pleasure to deal with and helped with all the technical questions we had.  Thank you again!
"
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+17

Recommended by85%of homeowners
major league contracting services
5.0(
10
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+43 more

Serving Key Largo, FL and surrounding areas

In business since 1990

Free estimates

Emergency services offered

"I had debated installing a new system for months. I shopped around; looked at reviews; and decided to go with Major League Contracting Services! The owner, Laz, came from Miami to my home in West Delray to give me an estimate. He said my current unit was too small, and that after 12 years it was time to replace it. We agreed on a price, and set an installation day. They came up on a Saturday and installed my new "York 3.5 ton unit." The air handler is in my attic so it was a tad tricky. After a couple of hours the unit was installed! The installers were very quick, informative, knowledgeable, and polite. Laz even came up and explained the work and even offered to file my registration with York. If you want to work with a local company that goes above and beyond to provide excellent service as well as a competitive then Major League Contracting is the company to use. Call Laz today at 786-344-1846."
4 TON RHEEM...Flood Zone....
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+13

Recommended by100%of homeowners
Avatar for North Alabama Technical Services
North Alabama Technical Services
4.9(
124
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+43 more

Serving Key Largo, FL and surrounding areas

In business since 2010

Emergency services offered

Credit card accepted

"Mr. Ferrell came to my home and picked up my dinosaur of a computer...a 2005 Dell Desktop.  For all intents and purposes, it was barely running.  If I was lucky, I was able to check my gmail and sometimes send a response.  Mr. Ferrell picked up my computer on his DAY OFF (Friday) and returned it to me on LABOR DAY.  He said that my computer had over 7,000 viruses on it. It was the most he had ever seen!  What I got back from him on Labor Day was the computer I purchased in 2005, but much better.
Mr. Ferrell installed an ENTIRE new operating system, he upgraded my ram, he re-installed his FREE virus protection.  Mr. Ferrell backed and restored ALL of my data.  And, if that was not enough, he updated my hardware system. And, he charged me $125 which I think is an incredible price due to the fact he gave me a BRAND NEW COMPUTER.
Mr. Ferrell is extremely professional, friendly, and incredibly efficient with his time and your money.  I just started using my new computer this week and I am in heaven.  No more viruses...no more waiting 10 minutes to pull up a website...and no more having to pull out all of my cords out of my modem and rebooting my computer.  I am thrilled with the job that Mr. Ferrell did and I would recommend him to anyone.
"
2014 Super Service Award Winner!
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Recommended by97%of homeowners
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FAQs for furnace / forced air heating system install or replace projects in Key Largo, FL

Converting from an oil furnace to an electric furnace isn't a simple swap—the oil system needs to be completely removed before installing the electric furnace. You'll need a full electric system installation, but you might be able to reuse existing ductwork if it's up to current safety standards. You’ll need to budget for a new electric furnace installation, which costs between $1,800 and $6,200, including professional removal, proper disposal, and safe installation of the new system.

Electric furnaces are 100% efficient at converting electricity into heat. However, some of that heat can be lost as it travels through your home's ductwork or escapes through poorly insulated areas. That's why regular duct maintenance and proper home insulation are important to maximize your furnace's efficiency and reduce heat loss, ensuring consistent warmth and lower energy costs.

With proper maintenance, an electric furnace can last anywhere from 20 to 30 years, outlasting the average gas furnace's lifespan of 15 to 20 years. To keep your electric furnace running efficiently, schedule regular cleanings, tighten connections, and have inspections done before winter arrives. With routine maintenance, you’ll ensure consistent, safe heating for years to come.

The size of the electric furnace you need depends on factors like your home's square footage, climate, and insulation quality. As a general guideline, those who live in warmer climates should multiply their square footage by 30 to 35 BTUs, while those in cooler areas should multiply it by 50 to 60 BTUs.

Consulting with an HVAC professional can help you determine the exact size that's right for your home.

An electric furnace works by converting electricity into heat using high-resistance heating elements. A blower then pushes the warm air through your home's ductwork, distributing heat evenly throughout your space. Since there's no combustion involved, electric furnaces eliminate the risks associated with gas furnaces and provide consistent, reliable heating when properly installed.

An electric furnace uses between 40 and 80 kilowatts per day to heat your home. The exact amount it uses depends on factors like your home's size, insulation, and overall energy requirements. Larger homes or those with poor insulation use more energy than smaller, well-insulated spaces. A professional furnace assessment can help confirm the ideal unit size for your needs.

The Key Largo, FL homeowners’ guide to furnace / forced air heating system installs or replaces

From average costs to expert advice, get all the answers you need to get your job done.