Seasonal 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.
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AfterHVAC Company in Marietta, GA
Coldharbour Heating & Air handles AC repair, furnace repair, and AC installation throughout Marietta, with most repair calls answered same day and pricing put in writing before any work begins. What sets Marietta jobs apart is the city’s split personality: historic homes near the Square with tight crawlspaces and no existing ductwork, and thousands of 1970s-80s brick ranches built for the Lockheed workforce with original flex-duct systems now failing in 130°F attics. That housing history changes what we find when we arrive, what parts we stock on our trucks, and how we size replacement systems. Call (817) 402-2972 and a live person picks up, 24 hours a day.
Why Marietta Homes Are Different
Marietta’s housing stock falls into two distinct camps, and the HVAC problems look completely different in each. Around Marietta Square and the historic districts, we work in pre-WWII balloon-frame and Craftsman homes where retrofitting central air means threading ductwork through tight, low-clearance crawlspaces that weren’t designed for it. The framing is often irregular, and we plan every install around what will actually fit without damaging structural members.
The much larger group is the 1970s-1980s suburban build-out east and northeast of downtown, thousands of brick ranches and split-levels constructed for Cobb County’s Lockheed Georgia plant workers. These homes are now 40 to 50 years old, and the vast majority still run on original flex-duct systems routed through unconditioned attics. In Marietta’s humid subtropical summers, attic temperatures routinely top 130°F. That heat degrades the plastic lining of flex duct, the insulation sags, and the connections delaminate. We see it every June: homeowners with running AC units but rooms that won’t cool because the cooled air is leaking into the attic before it reaches the vents.
The split-levels present their own challenge. The half-level separation between sunken living areas and upper bedrooms creates static-pressure imbalances that original installers often never solved. One system struggles to push enough air upstairs, and we get the predictable summer calls: hot upstairs, cold downstairs, every year. The humidity here is the other factor. Dew points in the low-to-mid 70s°F mean an oversized or leaky system doesn’t just waste energy; it leaves indoor moisture that breeds mold. And while Marietta winters are mild, periodic ice storms freeze outdoor heat pump coils and stress emergency heat strips harder than coastal Georgia systems ever see.
Our Main Marietta Services
Most calls we run in Marietta fall into three categories. Each has its own dedicated page with deeper detail on local conditions and what to expect.
AC Repair in Marietta
AC repair in Marietta means dealing with refrigerant leaks in coils stressed by years of high-pressure operation, failed capacitors in condensers baking on concrete pads, and the duct-leak problems that mimic equipment failure. We stock capacitors, contactors, and refrigerant on every truck, and we carry duct-sealing materials because so many “AC not cooling” calls turn out to be attic duct damage. Our technicians are trained to service all major brands, and every repair comes with our written 365-Day Done Right Promise. AC Repair in Marietta
Furnace Repair in Marietta
Furnace repair here is often heat-pump repair: most Marietta homes run electric heat pumps with auxiliary heat strips for backup. We see cracked heat exchangers in older gas furnaces near the historic district, but more commonly it’s a heat pump that won’t switch to emergency heat during an ice storm, or heat strips that have burned out from overuse. We test both the heat pump and the auxiliary system on every winter call, and we explain exactly what’s failing before we quote the repair. Furnace Repair in Marietta
AC Installation in Marietta
AC installation in Marietta requires load calculations that account for duct condition, attic temperature, and the humidity load that oversized systems can’t handle. On the 1970s ranches, we often recommend duct replacement as part of any system changeout because new equipment on failing ductwork wastes capacity. In historic neighborhoods, we design low-profile duct solutions that preserve floor plans and architectural detail. Every install gets a written fixed price, a scheduled date, and our guarantee that the system will perform to specification. AC Installation in Marietta
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 carry training and common parts for nine major residential brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. We stock capacitors, contactors, igniters, and refrigerant for the brands we see most often in Marietta’s older subdivisions, which means most repairs don’t wait on a parts run. our brands
Pricing for HVAC Company in Marietta, GA
| Service | Typical range in Marietta |
|---|---|
| AC Repair | $150-$650 |
| Furnace Repair | $150-$700 |
| AC Installation | $3,500-$7,500 |
| Tune-Up | $80-$200 |
What pushes Marietta prices toward the higher end: attic duct replacement added to a repair, crawlspace access complications in historic homes, and heat pump systems with failed auxiliary heat strips that require electrical testing. What keeps them lower: straightforward capacitor or contactor swaps on accessible equipment. Either way, we hand you a written price before any work starts, and that number doesn’t change when the job is done.
Neighborhoods We Serve in Marietta
We run calls across Marietta’s full footprint, from the historic districts near the Square to the postwar subdivisions and newer infill. Most appointments are scheduled within a two-hour window, and emergency calls are dispatched from our Atlanta office with crews already in Cobb County.
- Historic Marietta Square
- East Cobb / Roswell Road corridor
- Indian Hills
- West Cobb / Powder Springs Road area
- Kennesaw Mountain vicinity
Service Area – Cities Near Marietta
Our service radius extends to the full Cobb County area and adjacent communities. We regularly run calls in Smyrna, GA to the south, Kennesaw, GA to the northwest, Powder Springs, GA to the west, and Atlanta, GA for properties inside our service boundary. Dispatch is coordinated from our Atlanta office, with technicians routed from wherever they’re closest to your address.
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
Same-day service is standard for AC and furnace emergencies in Marietta, with most calls scheduled within a two-hour arrival window. Our phones are answered by a live person 24/7, and we dispatch from our Atlanta office to keep response times short across Cobb County. Call (817) 402-2972 to check current availability.
Some East Cobb and newer subdivisions do require HOA notification for outdoor unit replacements or pad relocations. We handle the documentation for any HOA we’ve worked with before, and we’ll tell you upfront if your neighborhood requires pre-approval so the install date doesn’t slip.
This is the classic split-level complaint in Marietta’s 1970s East Cobb build-out. The half-level design creates static-pressure imbalances that original ductwork often never solved. We measure airflow at each register and design duct modifications or zoning solutions that actually balance the system, rather than just selling you a bigger unit that won’t fix the root problem.
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
"Furnace wouldn't light the first cold morning. The guy walked me through what he was checking so I actually understood it. Replaced the igniter, wrote up the warranty, and it's been warm since."
- Alicia Romero"AC died overnight with a newborn in the house. They bumped us up the list and had it running by noon. I about hugged the guy. Fair price even on a rush call."
- Celeste Ngo"The repair was done well and quickly. Scheduling over the phone was a little clunky and I got transferred twice, but the tech himself was great and on time."
- Brett Haygood