A full HVAC installation or replacement in Kennesaw is a decision you live with for 12 to 18 years, so it should start with a home assessment and a Manual J load calculation — not a salesperson eyeballing your old unit. We right-size the whole system for your home and Georgia's humidity, then put clear, written options in front of you before anything is ordered.
Many Kennesaw homes built in the 1970s through the early 2000s are hitting the replacement window now, often with the AC and furnace aging out together. Replacing both at once usually costs less than two separate jobs, keeps the system matched for efficiency, and avoids pairing a new condenser with a tired air handler that drags its rating down.
Signs it's time to replace your whole HVAC system
A single repair is often the right call — but when several of these line up on an older system, replacement usually wins on cost and comfort:
- The system is 12+ years old and a major component (compressor, heat exchanger) has failed
- Repair bills are stacking up year after year
- Rooms are never evenly comfortable no matter how you set the thermostat
- Energy bills keep climbing even with normal use
- The system still uses R-22 refrigerant, which is expensive and being phased out
- The AC and furnace are both near end of life and only one has failed
How a whole-system installation works
No surprises — you approve the system and the price before we order anything.
- 1
Home assessment & load calculation
We measure the home, check insulation, windows, and ductwork, and run a load calculation so the new system is sized to your house — not just matched to the old box.
- 2
Written options you can compare
You get clear equipment options with SEER2 ratings, refrigerant type, warranty terms, and financing laid out side by side, so you can weigh efficiency against budget.
- 3
Professional install & ductwork check
We install the new system, correct any duct leakage or sizing problems that would waste the new efficiency, and handle the permit.
- 4
Commissioning & walkthrough
We charge the system to spec, verify airflow and temperature split, register the warranty, and show you how everything works before we leave.
What a whole-system replacement includes
A complete HVAC system is more than a condenser. Depending on your home we replace and match the outdoor unit, the indoor air handler or furnace, the coil, the thermostat, and any failing ductwork — so every part is rated to work together.
If you only need one component replaced, we also handle those individually: see our dedicated pages for AC installation & replacement, furnace installation & replacement, and heat pump installation. For a whole-home upgrade, we tie it all together under one load-calculated plan.
Matching the system to your Kennesaw home
There is no single best system for every house. A standard high-efficiency AC paired with a gas furnace gives strong, dependable heat through a North Georgia freeze. A heat pump handles our mild winters and hot summers on all-electric homes efficiently. A dual-fuel setup pairs a heat pump with a gas furnace for the best of both in larger homes.
We walk you through the trade-offs for your home, budget, and comfort goals — and we size it with a load calculation, because a system that is too big short-cycles and never pulls the humidity out of the air.
What a full HVAC replacement costs in Kennesaw
Published Atlanta-area research puts a full AC-and-furnace replacement around $5,000–$12,500, with some whole-home jobs running higher depending on equipment and ductwork. These are context ranges, not a quote — your price depends on system size, efficiency tier, and your home.
We give you a written, itemized price and walk through financing options so a necessary replacement doesn't have to be a crisis.
What affects your price:
- System size (tonnage) and the efficiency tier (SEER2 / AFUE) you choose
- Whether you replace AC-only, furnace-only, or the whole system together
- Equipment type — standard AC + furnace, heat pump, or dual-fuel
- Ductwork condition and any sealing or modifications needed
- Accessibility of the equipment (attic, crawl space, tight closet)
Why Kennesaw homeowners choose HVAC Kennesaw GA for hvac installation & replacement
We’ve spent 15+ years on Cobb County’s systems, and it shows in how we handle a hvac installation & replacement call: we test first, explain the reading, and put the price in writing before we touch anything chargeable.
- 4.9★ from 214+ Kennesaw & Cobb County homeowners
- GA Licensed Conditioned-Air Contractor · EPA Section 608 Certified Technicians
- Written options and your approval before any chargeable work
- Same-day service across Kennesaw & Acworth — 24/7 during ice storms and heat waves.
4.9★ Rated
214+ local reviews
Licensed & Insured
GA conditioned-air · EPA 608
24/7 Emergency
Same-day across Kennesaw
15+ Years
Serving Cobb County
HVAC Installation & Replacement across Kennesaw & Cobb County
We bring hvac installation & replacement to homes and businesses throughout Cobb County — from Acworth and Marietta to the East Cobb and West Cobb subdivisions, plus every Kennesaw neighborhood. We’re dispatched from 3600 Kennesaw N Ind Pky, so response times stay short across the area.