If you are a homeowner in Marietta, you know that our Georgia summers don't play around. When your old unit finally decides to retire, the first question is always: "How much is this going to cost me?"
At Guardian Home Experts, we believe in the "Knight Code"—which means total transparency. While every home on Canton Road or near Marietta Square is different, here is a breakdown of what you can expect for AC installation costs in Cobb County this year.
The Short Answer: Average Costs in Marietta
On average, a professional AC installation in Marietta typically ranges from $6,000 to $11,500.
If you are replacing a full system (including the furnace and indoor coil), most homeowners invest between $8,000 and $16,000. While these numbers might seem broad, the final price is determined by three main "Battle Factors."
1. The Size of Your "Castle" (Tonnage)
AC units are measured in "tons" (cooling capacity). A unit that is too small will run constantly, while one that is too large will "short cycle," leaving your home humid.
1.5 to 2 Tons: Typical for smaller homes or townhomes ($6,000 - $8,000).
3 to 4 Tons: Standard for average Marietta family homes ($8,500 - $11,000).
5 Tons: Needed for larger estates or homes with high ceilings ($11,000+).
2. Efficiency Ratings (SEER2)
In 2026, efficiency is measured by SEER2 ratings.
Standard Efficiency (14.3 SEER2): Lower upfront cost, but higher monthly Georgia Power bills.
High Efficiency (17-20+ SEER2): Higher upfront investment, but significant long-term savings and better humidity control—essential for our muggy Marietta summers.
3. The State of Your Ductwork
If your home near Noonday Park was built in the 80s or 90s, your ducts might need a "tune-up" of their own. Installing a high-powered new AC into old, leaky ducts is like putting a Ferrari engine in a lawnmower. Minor duct repairs can add $500-$1,500, while a full replacement can range from $3,000-$7,500.
How to Save on Your Marietta AC Installation
We know a new HVAC system is a major investment. Here is how the Knights help you save:
The $500 Meet or Beat Guarantee: Bring us a written estimate from any licensed Marietta like competitor. We'll beat their price by up to $500!
Federal Tax Credits: Under the Inflation Reduction Act, many high-efficiency systems qualify for up to $2,000 in tax credits.
Utility Rebates: We help you navigate local rebates from providers like Cobb EMC or Georgia Power.
Get a "No-Surprise" Estimate
Don't guess at your comfort. We offer customized hvac solutions to ensure you get exactly the system you need—nothing more, nothing less.
Call us at (770) 299-8207 to schedule your free estimate. Let the Knights protect your comfort and your wallet!
