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AfterFurnace Replacement in Alpharetta, GA
Furnace replacement in Alpharetta typically runs $4,200 to $8,900 for a complete system install, depending on furnace size, efficiency rating, and whether ductwork needs modification. Most replacements take one full day, sometimes two if we’re also replacing the AC coil or reworking the plenum. Dalton Heating & Air Alpharetta handles the whole job from load calculation to final inspection, with the price in writing before a single tool comes off the truck. If you’re weighing repair versus replacement, our Heating & Furnace in Alpharetta page covers the repair side in detail.
Key Takeaways
- Complete furnace replacement in Alpharetta: $4,200 – $8,900 installed
- Written price before work starts, on every job, no exceptions
- Factory-trained on Lennox, Goodman, Rheem, and York furnaces
- 365-Day Done Right Promise covers the full installation for a year
- Live phone answer 24/7 at (229) 537-2086
When You Need Furnace Replacement
Replacement is not a maintenance call. It’s the point where patching the old unit stops making sense. Here are the situations we see most often in Alpharetta homes before a swap-out:
- The heat exchanger is cracked. This is a carbon monoxide risk and the #1 reason we condemn a furnace. If our combustion test shows cracks, the furnace gets red-tagged, not patched.
- Your furnace is 18 years or older and the blower motor failed. A replacement motor can cost $600 – $900 on an old unit. Putting that money into a furnace that’s already past its expected lifespan is a losing bet.
- Repair costs have hit $1,500+ in the last two years. Once you’re spending repair money that adds up to a third of a new system, replacement starts making financial sense.
- Rooms heat unevenly, no matter what. This is often an airflow or capacity problem. If the furnace was sized wrong from the start, no repair fixes it. Only a properly sized replacement does.
- The furnace is original to a home built in the 1990s. Alpharetta has a lot of 25- to 35-year-old housing stock. If your furnace is original, it’s running at 70-80% efficiency at best. A new 96% AFUE unit cuts gas use by a measurable amount every winter.
Our Furnace Replacement Process
We follow the same sequence on every replacement, whether it’s a 1,200-square-foot ranch near Wills Park or a larger two-story off Kimball Bridge Road. No shortcuts, no skipped steps.
- Load calculation first. We measure square footage, window area, ceiling height, and insulation levels. The furnace gets sized to the house, not to whatever the old unit happened to be. An oversized furnace short-cycles and dies young; an undersized one never keeps up.
- Written proposal with three options. We quote the job at good, better, and best efficiency tiers, each with a specific furnace model and exact dollar figure. You decide based on budget and how long you plan to stay in the home. The price is in writing before any work begins.
- Scheduled install with a firm arrival window. You get a named technician and a two-hour window. The uniformed tech arrives inside that window, background-checked, and ready to work. No “sometime between 8 and 5.”
- Removal and installation. We pull the old furnace, check the existing duct connections, set the new unit, and connect gas, electrical, and venting. We also inspect the flue or vent pipe, which is a common source of problems on older Alpharetta homes.
- Startup, testing, and walkthrough. We fire the furnace, verify gas pressure, test the safety switches, and check temperature rise. Then we walk you through the new thermostat settings and show you exactly what was done.
- Cleanup and written guarantee. We haul off the old equipment, sweep the area, and hand you the written installation guarantee. It covers the entire job for a full year under the 365-Day Done Right Promise.
Furnace Replacement Pricing in Alpharetta
Here’s what we see in the Alpharetta market right now, based on the homes we work in across the city:
- Basic 80% AFUE single-stage furnace, 60,000 – 80,000 BTU: $4,200 – $5,400 installed
- Mid-range 96% AFUE two-stage furnace, 60,000 – 100,000 BTU: $5,800 – $7,200 installed
- High-efficiency 96-98% AFUE modulating furnace with variable-speed blower: $7,500 – $8,900 installed
- Add-on if the AC coil is replaced at the same time: $800 – $1,500, depending on coil type and refrigerant lines
- New thermostat, if needed: $150 – $350 for a smart or programmable model
What moves the number: furnace size in BTUs, efficiency tier, whether the existing duct connections line up cleanly, and whether we need to run a new PVC vent for a high-efficiency condensing unit. Older Alpharetta homes with tight mechanical closets sometimes need a little extra sheet metal work. Whatever the case, the proposal lists every dollar before you approve anything. Call (229) 537-2086 and we’ll send a technician out for a free replacement estimate. No pressure, no same-day hard sell.
Brands We Install
We’re factory-trained on the equipment we put in, which matters more than the logo on the cabinet. The brands we carry most often for Alpharetta homes are Lennox, Goodman, Rheem, and York. Each has strong models at different price points. Goodman gives you solid efficiency for less money. Lennox tends to lead on the variable-speed and modulating end. Rheem and York both make dependable mid-tier workhorses. We don’t push one brand; we match the furnace to your budget and the house’s load. But every unit carries a manufacturer parts warranty, and our installation work is covered by the full-year written guarantee that comes with every Dalton job.
Why Alpharetta Homes Need Furnace Sizing Done Right
Alpharetta’s winter design temperature sits around 23°F, which means your furnace needs to handle real cold snaps, not just mild Georgia winters. But the same humidity that makes summers brutal also means airflow and duct sizing matter year-round. An oversized furnace will blast short bursts of heat and shut off, never running long enough to dry out the air. That leaves you with cold spots, hot blasts, and higher gas bills. A correctly sized furnace runs longer, more even cycles. It’s quieter, it filters better, and it burns less gas. We do the load calculation on every replacement because a furnace that’s sized by guess is a furnace that underperforms for its entire life.
FAQs – Furnace Replacement
How much does furnace replacement cost in Alpharetta?
Most complete furnace replacements in Alpharetta run $4,200 to $8,900, depending on BTU size, efficiency rating, and whether ductwork needs modification. Call (229) 537-2086 for a written quote on your specific home. Estimates are free.
How long does furnace replacement take?
A standard furnace swap-out takes one full day, usually 5 to 8 hours. If we’re also replacing the AC coil or modifying ductwork, plan for a second day. We give you a firm schedule in writing before the install date.
Is it cheaper to repair or replace my furnace?
If your furnace is under 12 years old and the repair is under $500, repair usually wins. If it’s 15+ years old and the repair quote is over $1,000, replacement is typically the smarter money. The 50% rule works well: if the repair costs more than half the value of the remaining life, replace it. We’ll show you the numbers either way and let you decide without pressure.
Can you install a new furnace in an older Alpharetta home without replacing the ductwork?
In most cases, yes. Most homes built since the 1980s have ductwork that can support a new furnace. We inspect the ducts during the estimate and tell you if the old system is leaking badly enough that the new furnace won’t perform. A new furnace on badly leaking ducts is wasted money, so we flag it before you spend anything.
Contact
Get a straight answer on furnace replacement for your Alpharetta home. Call (229) 537-2086 and a live person picks up, any hour, any day. We’ll schedule a free estimate, put the price in writing, and if the work doesn’t hold for a full year, we come back at no charge. That’s the deal on every job, no fine print.
Written by Marco Benitez, Owner at Dalton Heating & Air Alpharetta, serving Alpharetta.