Furnace & heating
AC repair
Heat pumps
Ductless mini splits
Carrier
Trane
GoodmanSeasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
Get your free estimateHVAC Company in Marietta, GA
Cold Harbour Heating and Air handles HVAC work across Marietta, from AC repair to furnace repair to full AC installation. What makes Marietta jobs different from the rest of metro Atlanta is straightforward: the housing stock is older on the west side, newer on the east side, and the climate punishes every weak point in between. Humid subtropical summers push air conditioners hard for five straight months, and the older ranch homes with original ductwork were never sized for the additions people put on over the decades. If you need an HVAC company in Marietta, call Cold Harbour Heating and Air at (762) 240-5599.
Why Marietta Homes Are Different
Marietta’s housing stock splits roughly into two camps, and both create their own HVAC headaches. The central and west neighborhoods hold a lot of 1950s through 1970s ranch homes with original undersized ductwork. Many of those homes have returns only in the central hallway, so a room added over the garage or a converted carport ends up with sweaty registers and a muggy bonus room. The east side of Marietta, around areas like East Cobb and the Paper Mill Road corridor, skews toward 1980s and early-2000s subdivisions where horizontal furnace and air handler units sit in attics. Attic systems work, but they live in the hottest part of the house all summer, and the duct runs lose efficiency fast if they were installed with the original builder-grade flex duct. Add in the humidity that hangs over Marietta from June through September, and indoor moisture control becomes part of the conversation in a way it just isn’t in drier parts of Georgia. Winter cold snaps are usually brief, but they do dip below freezing, which means the heat side of the system matters too, not just the cooling.
Styles & brands we work with
Our Main Marietta Services
Most Marietta homeowners call us for one of two reasons: the AC has quit in July, or the furnace won’t fire on a January morning. Installation work is the third leg of what we do, and it starts with a load calculation, not a guess.
AC Repair in Marietta
AC repair in Marietta is a summer reality. The systems here run constantly from late May into September, and the weak points show up fast: capacitors that fail after years of heat, condensate lines that clog with our humidity, and low refrigerant from a slow leak. On a 95-degree Marietta afternoon, a failed compressor or a blown blower motor isn’t something to wait on. We keep common parts on the trucks, give you a written price before work starts, and back every repair with our 365-Day Done Right Promise. If the fix doesn’t hold inside a year, we come back and correct it at no charge. For the full breakdown on AC Repair in Marietta, that page covers pricing, common failures, and same-day availability.
Furnace Repair in Marietta
Furnace repair in Marietta is less about extreme cold and more about surprise cold. The hard freezes don’t last long, but when the temperature drops into the 20s and a gas furnace won’t light, a cold house gets uncomfortable fast. The most common calls we see in Marietta are failed igniters, dirty flame sensors, and pressure switches that trip on older furnaces with long vent runs. Some east side homes with attic furnaces also struggle with condensation freezing in the venting during an extended cold snap. If you need it, our Furnace Repair in Marietta page explains the repair process, typical costs, and what to check before you call.
AC Installation in Marietta
AC installation in Marietta is a bigger job than swapping a box. Older Marietta homes with original ductwork usually need a manual J load calculation to size the new system correctly, especially if additions or conversions have changed the square footage. On the east side, a lot of the 1990s and 2000s homes have attic units that are due for full replacement, and the job involves pulling the old air handler and coil out through the attic access and setting the new one in. We stock equipment options from several major brands and always provide a written fixed price before any work starts. You’ll find a complete rundown on AC Installation in Marietta, including system sizing, brand options, and financing.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Marietta
Our technicians are trained to work on all major residential HVAC brands including Trane, Lennox, Goodman, and Rheem, plus Carrier, York, Daikin, Bryant, and American Standard. We don’t push a single brand. The right system for a 1960s Marietta ranch may not be the right system for a 2005 east side subdivision house. Read more about our brands to see what we service and install.
See the difference
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After
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AfterPricing for HVAC Company in Marietta, GA
We give every Marietta homeowner a written price before any work starts. The numbers below reflect what we typically see in the Marietta market for common HVAC jobs.
| Service | Typical range in Marietta |
|---|---|
| AC repair (minor: capacitor, contactor, condensate line) | $150 – $650 |
| AC repair (major: blower motor, compressor, coil) | $150 – $650 |
| Furnace repair (minor: igniter, flame sensor, pressure switch) | $150 – $700 |
| Furnace repair (major: control board, inducer motor, gas valve) | $150 – $700 |
| AC installation (single-stage, 14 – 16 SEER) | $3,500 – $7,500 |
| AC installation (two-stage or high-efficiency, 17+ SEER) | $3,500 – $7,500 |
| HVAC tune-up (cooling or heating seasonal service) | $80 – $200 |
| Furnace tune-up (heating seasonal service) | $80 – $200 |
What pushes a Marietta AC installation toward the top of that range? Older homes that need duct modifications or a new return added, attic access that’s tight and slow to work in, and high-efficiency equipment. Repair costs climb when a system is over 15 years old and has multiple worn components. The written price we hand you before work starts is the price you pay, no door swings, no surprises.
Neighborhoods We Serve in Marietta
We run calls all over Marietta, from the historic district near the Square to the subdivisions off Barrett Parkway and the older neighborhoods around Whitlock Avenue and Powder Springs Road. Response time across the Marietta area is typically same-day for AC repair calls during the cooling season and next-morning for furnace work, with a live person answering the phone around the clock.
- East Cobb corridor and the Paper Mill Road area
- Historic Marietta Square and surrounding streets
- Whitlock Avenue corridor west toward Kennesaw Mountain
- Barrett Parkway and the north side neighborhoods
- Powder Springs Road corridor and southwest Marietta
Service Area – Cities Near Marietta
Our Marietta crews also cover the surrounding Cobb County and west metro communities. If you’re in Smyrna, GA, Kennesaw, GA, Powder Springs, GA, or Mableton, GA, we run calls there too, with the same written price and 365-Day Done Right Promise.
Serving Marietta, GA - Our Local Coverage Area
We’re based in the Marietta area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About HVAC Company in Marietta
For AC repair calls during the cooling season, we typically arrive the same day. Furnace repair calls are usually next-morning, unless it’s a hard freeze, in which case we prioritize no-heat homes. A live person answers the phone 24 hours a day, so you’ll know your window before you hang up.
Most AC replacements in Marietta require a mechanical permit, which we handle as part of the installation. Repairs generally don’t require a permit. We coordinate with the city and Cobb County requirements so the job is filed correctly, and we walk you through that before work starts.
We cover the entire Marietta area, from East Cobb to the Square to the Barrett Parkway corridor and beyond. If you’re in Cobb County near Marietta, call (762) 240-5599 and we’ll confirm coverage and get you on the schedule.
What happens when you call
- 1A real person answersNo phone trees - talk to a local hvac pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Marietta Customers Say
"AC quit on the hottest day of the year of course. Coldharbour had a tech out that evening, found a bad capacitor, and had us cool again within the hour. Charged the quote, not a penny more."
- Doug Feeney"Furnace was short cycling all winter. They diagnosed a bad sensor instead of condemning the whole unit like I feared. Cheap fix, honest call."
- Russ Tiedemann"Signed up for a tune up before summer. He found a part starting to fail and showed me the reading, didn't just tell me to trust him. Fixed it then so we wouldn't get stuck in July."
- Sophia Tran