Mableton homes get furnace repair, AC repair and gas furnace safety checks from us. Cobb County's largest city has a wide mix of house ages, and most residents own their homes. Hard cold snaps like January 2025's 14F night test furnaces, while long humid summers test the AC. We answer the phone around the clock.
Cobb's newest city, with old roots
Mableton became a city in 2023 after a 2022 referendum, is now Cobb County's most populous city, and keeps the 1843 Robert Mable House. A new city government does not mean new houses. The HVAC systems here span many generations, from aging gas furnaces to recent heat pumps.
About 64 percent of occupied homes across Cobb County are owner-occupied. For most Mableton owners, then, the question on an older system is how much life it has left and what the next one should be.
Cold snaps that find weak furnaces
January 2025 ran about 4F colder than normal in Atlanta, with winter storms on January 10 and 21 and a low of 14F on January 22. Two years earlier, the National Weather Service recorded 8F on December 24, 2022. Nights like those run furnaces for hours, and that is when cracked ignitors, dirty flame sensors and failing inducer motors give out.
A furnace repair call usually starts with the ignition sequence and the error code on the board. On older furnaces we also look at the heat exchanger and the flue, because a gas furnace CO and safety test matters more as a furnace ages.
Summer strain and a smarter thermostat
In summer, Atlanta's July averages a high near 89F with overnight lows around 71F, which keeps the AC working into the night. Capacitors, contactors and condenser fan motors are what fail most.
A properly wired smart thermostat can cut runtime without sacrificing comfort, but heat pumps and dual fuel systems need correct wiring for the reversing valve and auxiliary heat, and many older Mableton systems lack a C-wire. We add the wire or an adapter and set up the staging before we leave.
Heating and cooling work that fits Mableton
Furnace Repair
Mableton furnaces with weak ignitors fail on nights like January 2025's 14F low.
Gas Furnace Safety & CO Testing
Aging gas furnaces in Mableton deserve heat exchanger and flue draft checks before winter.
AC Repair
July nights around 71F keep Mableton AC parts under load around the clock.
Smart Thermostat Installation
Many older Mableton systems need a C-wire added before a smart thermostat works reliably.
Furnace Replacement
Owners of older Mableton furnaces weigh an 80 versus 95 percent replacement for the long term.
Mableton heating and air questions
Note the blink pattern and match it to the chart on the inside of the furnace door. Common codes point to a pressure switch, flame sensing or ignition. Turning the power off and on may reset it, but a code that keeps returning needs a service call.
A 95 percent furnace burns less gas but needs PVC venting and a condensate drain. An 80 percent furnace can often reuse the existing metal flue. The choice depends on your gas use, the venting path and the budget.
Often there is no C-wire to give it steady power, or the system is a heat pump that needs the reversing valve and aux heat wired correctly. We add a C-wire or an adapter and set up the staging so it runs the equipment properly.
You usually cannot tell by looking. Signs include soot around the burners, a rollout switch tripping, flame that dances when the blower starts, or CO detector alarms. A technician inspects with a camera and tests combustion to confirm.
Yes, and it often has to. With overnight lows around 71F, the house sheds little heat after dark. Long cycles are normal. Constant running with the house still warming points to a dirty coil, low charge or weak blower.
Updated October 2026