AC Repair in

Dunwoody, GA

AC Repair in Dunwoody, GA | One Hour North Atlanta

EPA 608 certified, NATE certified, and factory authorized on Daikin, Trane, Rheem, and Carrier, One Hour Heating & Air Conditioning of North Atlanta handles the full range of AC repair work for Dunwoody homeowners under Georgia HVAC license GAREGCN2011384. From component swaps on equipment in 1950s and 60s ranch homes to multi zone diagnostics on newer Dunwoody Village area infill, we dispatch 24/7 from our office at 1360 Union Hill Rd in Alpharetta, a short drive from Dunwoody Club Forest, Dunwoody North, Hidden Branches, Withmere, and the Dunwoody Village area. Our $89 service call covers the diagnostic and written estimate, waived if you approve the repair. Every repair is backed by our

“Always On Time...Or You Don't Pay A Dime!®” guarantee and a 100% Satisfaction Guarantee for two years.

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Georgia HVAC license GAREGCN2011384

EPA 608 certification PFWXHNZ4MT

NATE certification 1023518

Daikin

Trane

Rheem

Carrier

What We Repair on Residential AC Systems

A residential AC system has dozens of components that can fail, and the symptom a homeowner notices rarely points cleanly at the actual cause. Here's the range of repairs we handle on Dunwoody calls:

  • Refrigerant problems. Low refrigerant, restricted refrigerant flow, or wrong refrigerant charge from a prior service call. Symptoms include weak cooling, frozen evaporator coils, or the system running constantly without cooling the house.

  • Frozen evaporator coils. The system ices over and stops cooling. Almost always a symptom of something else, not the actual problem.

  • Compressor problems. Hard starting, short cycling, or full compressor failure. The compressor is the most expensive single part in the system, and the diagnostic needs to be right before anyone replaces one.

  • Electrical component failures. Capacitors, contactors, relays, and start kits. These are common failures on systems past the seven year mark and are routine service calls in Dunwoody's 1950s through 70s ranch neighborhoods where equipment is often on its third or fourth generation by now.

  • Refrigerant leaks. Leaks at the evaporator coil, condenser coil, line set, or service valves. We pressure test, find the leak, and fix it rather than just topping off the refrigerant and waiting for you to call us back.

  • Drainage and condensate issues. Clogged condensate drains backing up into the indoor unit, overflow switches tripping, or pump failures on units that need them. Dunwoody's heavy mature canopy (oak, pine, sweetgum) drives a heavy pollen load on condensate drains February through May.

  • Airflow problems. Dirty filters, blocked return air, blower motor failures, or ductwork issues restricting flow. A system can have perfectly good refrigerant pressures and still not cool the house if airflow is wrong, and this is a major category of work in Dunwoody because so much of the housing has original 1950s through 70s ductwork that's now leaking heavily.

  • Thermostat and control problems. Thermostat failures, wiring issues, or compatibility problems with smart thermostats installed by homeowners or third parties. Dunwoody has a mix from older mechanical thermostats in original 1950s and 60s homes through Nest, Ecobee, and Honeywell smart thermostats in newer infill.

  • Sensors and safety switches. Float switches, high pressure switches, low pressure switches, and freeze stats. These shut the system down to protect it, and the right response is to find what's wrong, not bypass the switch.

  • Outdoor unit problems. Fan motor failures, condenser coil damage, debris in the unit, or grade settling causing the pad to tilt. The mature canopy across Dunwoody pushes leaf and pollen debris into outdoor units at higher rates than newer construction areas.

  • Ductwork issues. Disconnected ducts, crushed ducts, leaking joints, or undersized returns. This is a major Dunwoody category. Original 1950s through 70s ductwork in attics and crawl spaces commonly leaks 20 to 30% by now, and a lot of homes were retrofitted for central air with ductwork that was undersized from the start.

  • Zone control failures. On multi zone systems, zone damper motor failures, control board issues, or sensor problems that cause one zone to cool while another doesn't. Larger Dunwoody homes and newer luxury infill frequently run multi zone setups, while many of the 1950s and 60s ranch homes have single zone systems with separate basement and attic equipment.

How We Diagnose AC Problems

The diagnostic process is the same on every call regardless of brand, age, or system type. The technician starts by listening to what the homeowner is describing. When did the problem start, what changed, what's normal for the system. That conversation often points the diagnostic in the right direction before any tools come out.

From there, the technician works through the system in order. The thermostat and zone controls come first, because a thermostat problem can look exactly like an equipment problem from the homeowner's perspective. On Dunwoody's older homes where the original system is sometimes split between a basement furnace and attic ductwork on retrofitted central air, we confirm the controls are commanding the right equipment before chasing anything downstream. Airflow comes next, both at the equipment and at the registers in the rooms. Dunwoody's original 1950s through 70s ductwork commonly leaks 20 to 30%, and that gets investigated before we go after refrigerant or compressor issues, because ductwork problems can mimic an undersized AC.

Refrigerant pressures get checked against the manufacturer's spec on the unit nameplate, not against a generic chart. Different equipment runs at different pressures, and using the wrong reference is how people overcharge or undercharge systems. Electrical components get tested with a meter. Capacitors are checked against their rated value, not eyeballed by how they look. Contactors get tested under load.

The technician then walks through the outdoor unit, the indoor unit, and the connections between them. Refrigerant line set condition, electrical connections, drain line condition, and outdoor unit grade and clearance all factor in.

Once the diagnostic is complete, the technician walks through findings with the homeowner before any repair work starts. The homeowner gets a written estimate, and the homeowner approves or declines before any parts come off the truck. The $89 service call covers the visit, the full diagnostic, and the written estimate. If you approve the repair, the $89 is applied to the repair cost.

AC Repair in Dunwoody, What's Specific to This City

Dunwoody incorporated in 2008, and HVAC permits and inspections now run through City of Dunwoody Community Development rather than unincorporated DeKalb. The jurisdictional difference is relatively new compared to longer established cities, and the fee schedules and inspection patterns are specific to Dunwoody. Most repair work doesn't require a permit, but system replacements do.

Water comes from DeKalb DWM through the Scott Candler Filter Plant, drawing from the Chattahoochee, at about 8 gpg, which is moderately hard. The water itself doesn't drive AC repair patterns much, but it's worth knowing.

What really shapes AC repair in Dunwoody is the housing stock. Dunwoody has the oldest concentration of residential housing of any city we serve, with 1950s through 1970s ranch construction dominant in most established neighborhoods. These homes were designed and built without central air. Central AC was retrofitted decades after original construction, in many cases multiple times as equipment failed and got replaced. The original retrofit work was often done with undersized equipment for the home's actual cooling load, ductwork added through whatever chases were available, and the system arrangement that's now common: a furnace in the basement with ductwork running up through the home to registers in each room, with the AC evaporator coil sitting on top of the furnace and the condenser outside.

That basement furnace plus attic ductwork combination creates specific diagnostic patterns. The blower in the basement furnace has to push air all the way up through the home to second floor registers and back down through return air. When the ductwork leaks 20 to 30% in the attic or crawl space, the system can't deliver the cooling it's rated for, and the symptom looks like an AC capacity problem rather than a ductwork problem. We see this on Dunwoody calls regularly.

The original equipment from those 1950s through 70s retrofits is long gone, but the ductwork often hasn't been updated. Many homes are now on their third or fourth generation of AC equipment running through ductwork that's still original. The conversation about whether to repair or replace often involves the ductwork as much as the equipment itself.

The mature tree canopy across Dunwoody (oak, pine, sweetgum) drives heavy pollen and debris loads on outdoor units and condensate drains from February through May. Filter changes, evaporator coil cleaning, and condensate drain clearing are heavier maintenance items in Dunwoody than in less wooded areas.

The newer luxury infill scattered through Dunwoody (Dunwoody Village area newer construction, recent rebuilds in established neighborhoods) presents a different repair profile, with 2010s and 2020s factory installed multi zone equipment, communicating systems, and variable speed compressors. The diagnostic on those systems requires brand specific service tools and procedures.

Problems We See More Often in Dunwoody Homes

  • Undersized retrofitted central air in 1950s and 60s ranch homes. Many of these homes had AC retrofitted in the 1970s, 80s, or 90s with equipment that was sized to fit the budget of the time rather than the home's actual cooling load. As that original retrofit equipment got replaced over the years, sometimes the undersizing was corrected and sometimes it wasn't. We still see homes where the AC is running constantly in summer because the equipment is too small for the house, and the diagnostic conversation includes whether the current system is right sized.

  • Original 1950s through 70s ductwork leaking 20 to 30%. A homeowner calls because the upstairs bedrooms aren't cooling, or the back of the house is always warmer, or the utility bills are climbing. The diagnostic finds that the AC equipment is fine but the ductwork is leaking heavily in the attic or crawl space. The fix isn't a refrigerant top off or a new compressor, it's ductwork sealing or replacement. This conversation comes up regularly on Dunwoody calls.

  • Basement furnace and attic ductwork combination failures. The system arrangement common in Dunwoody, with the furnace and AC indoor equipment in the basement and ductwork running up through the home, creates specific failure patterns. Blower motors work harder pushing air through long duct runs. Condensate drains in basement air handlers have specific routing requirements. We diagnose these systems often enough to know the patterns.

  • Condensate drain clogs from heavy spring pollen load. Dunwoody's mature canopy drives one of the heaviest pollen loads in our service area. Condensate drain clogs from pollen sludge mixed with biological growth are a routine spring and early summer service call.

What to Expect on the Day

When you call us, dispatch confirms your address and the symptom you're describing. We give you an arrival window, and we hold to it. If we're late, you don't pay for the diagnostic. That's the “Always On Time...Or You Don't Pay A Dime!®” guarantee.

When the technician arrives, they walk through the system with you, run the diagnostic, and walk through findings before any repair work starts. You get a written estimate, you approve or decline, and the repair happens that day in most cases because our trucks carry over 1,500 parts. If the repair needs a part we don't have on the truck, we schedule the return trip and let you know how long. The $89 diagnostic is waived when you approve the repair.

Most AC repair calls in Dunwoody finish in two hours or less. Diagnostics that involve walking through basement equipment plus attic ductwork on older retrofitted systems can run longer because there's more to investigate.

Cost Considerations for Dunwoody Homeowners

AC repair in Dunwoody runs $228 to $3,000+ depending on what's wrong. The low end covers capacitor and contactor replacements, which are common on equipment in 1950s through 70s ranch homes that's now on its third or fourth generation. The high end covers compressor replacements, full coil replacements, and major ductwork repair when the diagnostic uncovers leakage that's been masking as an equipment problem.

Older Dunwoody homes can push repair costs higher when the diagnostic uncovers issues beyond a single component. An undersized retrofitted system, original ductwork that's leaking 30% in the attic, or a basement furnace and attic ductwork combination that needs significant work all change the math. We walk through those findings before any work expands beyond the original scope.

If your system is twenty plus years old and the repair quote is approaching half the cost of a new system, we'll tell you straight rather than push the repair. AC replacement runs $2,500 to $8,000+ with financing as low as $109/month. A complete HVAC system (AC plus furnace or heat pump combination) runs $7,000 to $25,000+, and that range is where a lot of Dunwoody conversations land because replacing the AC on an older home often involves addressing the ductwork, the furnace, or both at the same time.

Our Comfort Club membership is $177/year and includes one AC tune up, one furnace tune up, priority scheduling on service calls, and 15% off all repairs. For Dunwoody homeowners with older retrofitted systems where pollen drives more frequent maintenance and the ductwork conversation comes up regularly, the membership math usually works out favorably on a single service call most years. The $89 diagnostic is also waived for Comfort Club members.

City of Dunwoody permit fees [VERIFY: City of Dunwoody HVAC permit fee schedule] for system replacements are billed separately from the repair or replacement cost.

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Recent Work Near Dunwoody

Dunwoody Club Forest 1962 brick ranch with central air retrofitted in the early 1990s and equipment replaced in 2013. Homeowner called because the upstairs bedrooms weren't cooling on a 93 degree afternoon. Diagnostic found the AC equipment was operating within spec but the attic ductwork was leaking approximately 28% measured at the registers. Repaired the immediate issue (a partially blocked return air filter) and walked the homeowner through the ductwork conversation as a separate decision. Homeowner scheduled ductwork sealing as a follow up.

Hidden Branches 1968 split level home with basement furnace and attic ductwork on a 2015 AC replacement. Homeowner called because the AC was tripping the breaker on startup. Diagnostic found a failed capacitor and a marginal hard start kit on the outdoor condenser. Replaced both parts and tested the system through a full cooling cycle. Same day repair, finished in about ninety minutes.

Withmere area 1965 ranch with original central air retrofitted in the late 1980s, equipment replaced twice since. Homeowner called because the AC was running constantly and the house wasn't getting below 78 degrees. Diagnostic found low refrigerant from a leak at the evaporator coil joint in the basement, plus moderate ductwork leakage in the attic. Repaired the coil leak, recharged with R-410A, and documented the ductwork condition with measurements for the homeowner to consider separately.

Neighborhoods in Dunwoody

Dunwoody Club Forest, Dunwoody North, Hidden Branches, and Withmere. These established neighborhoods are heavily 1950s through 1970s ranch and split level construction. Most homes have central air retrofitted onto homes that weren't designed for it, and the current equipment is typically on its third or fourth generation. Original ductwork in attics and crawl spaces commonly leaks 20 to 30%. Basement furnaces with attic ductwork are a common system arrangement.

Wyntercreek and Brooke Farm. Similar housing era and patterns to Dunwoody Club Forest, with comparable retrofit considerations. Mature canopy throughout these neighborhoods drives heavy spring pollen load on condensate drains and outdoor units.

Dunwoody Village area newer infill. Recent luxury construction and rebuilds in and around the Dunwoody Village area use factory installed multi zone equipment, communicating systems, and variable speed compressors. Repair work here is more often communicating system diagnostics and brand specific electronic component failures rather than the retrofit issues common in the older neighborhoods.

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FAQs About AC Repair in Dunwoody

Does Dunwoody handle its own HVAC permits or does DeKalb County?

Dunwoody has handled its own permits and inspections through City of Dunwoody Community Development since the city incorporated in 2008. The fee schedule and inspection scheduling are separate from unincorporated DeKalb County. Most repair work doesn't require a permit, but system replacements do.

My house was built in 1962 and the AC keeps struggling on hot afternoons. Is the AC too small?

Maybe. Many 1950s and 60s Dunwoody homes had central AC retrofitted with undersized equipment from the start, and that undersizing sometimes carried forward through subsequent equipment replacements. The diagnostic includes a Manual J style review of the home's actual cooling load against the current equipment's rated capacity. It's worth knowing whether you're dealing with a worn out system or a system that's simply too small for the house.

My AC ices up every few weeks. What's actually causing it?

A frozen evaporator coil almost always means one of three things: low refrigerant from a leak, restricted airflow from a dirty filter or blocked return, or a stuck blower motor. We thaw the system, find the underlying cause, and fix the cause. Just refilling the refrigerant without finding the leak means you'll be calling us back in a month.

Why does it feel like one side of my older Dunwoody home is always warmer than the other?

Usually a ductwork issue rather than an equipment issue. Original 1950s through 70s ductwork commonly leaks 20 to 30% in attics and crawl spaces by now, and that leakage isn't evenly distributed across the home. The rooms farthest from the air handler or with the worst duct runs end up underserved. The diagnostic measures airflow at the registers and identifies where the loss is happening. The fix is ductwork sealing or replacement, not necessarily a new AC.

My basement furnace has the AC equipment on top of it. Is that a problem?

Not inherently. That's a common arrangement in Dunwoody homes where central air was retrofitted onto a forced air heating system. The blower in the furnace pushes both heated and cooled air through the same ductwork, and the AC evaporator coil sits on top of the furnace cabinet. It works fine when the equipment is right sized for the home and the ductwork is in good shape. Problems usually come from the ductwork or undersized equipment, not from the arrangement itself.

Is the Section 25C federal tax credit still available for heat pump installations?

No. The federal Section 25C tax credit for air source heat pumps expired December 31, 2025, under the One Big Beautiful Bill Act. Heat pump installations in 2026 and later don't qualify for the previous $2,000 federal credit. Georgia's GEFA rebate program is still active and can be worth significantly more depending on household income and projected energy savings. Geothermal heat pumps still qualify for the 30% federal credit under Section 25D through 2032.

How long does an AC system last in Dunwoody?

Ten to fifteen years for most homes, with some variation based on how hard the system has to work. Original retrofitted systems that were undersized from the start tend to wear faster because they run more. Dunwoody homes from the 1960s and earlier are typically on their third or fourth AC system by now, and the conversation we have most often is whether the next failure tips into replacement territory or warrants one more repair.

Contact and Directions

  • 1360 Union Hill Rd #5F, Alpharetta, GA 30004

  • Phone: (404) 689-4168

  • Hours: 24/7 emergency service. Standard appointment hours

  • Georgia HVAC License: GAREGCN2011384

Fully insured and bonded.

Our office is a short drive from Dunwoody, with regular dispatch to Dunwoody Club Forest, Dunwoody North, Hidden Branches, Withmere, Wyntercreek, Brooke Farm, and the Dunwoody Village area. We respect you, we respect your time, and our trucks carry over 1,500 parts so most repairs finish in a single visit.

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