Load-calculated sizing
We size the system to your home — not just square footage — so it dehumidifies properly and doesn't short-cycle.
New System Installation
HVAC & AC System Installation in Marietta, GA
A new heating and cooling system is one of the biggest single investments a homeowner makes. It should be sized to your actual home, installed cleanly, and matched to how you actually live — not up-sold based on what's on the truck. McCall's designs and installs residential HVAC systems across Marietta and metro Atlanta with a focus on airflow, longevity, and honest sizing.
Why Neighbors Choose Us
What sets McCall's apart on a hvac installation call.
Clean, respectful install
Floors covered, old equipment hauled away, work areas left cleaner than we found them.
Multiple efficiency tiers
Standard 14–15 SEER through variable-speed 20+ SEER — we walk you through the real payback period, not marketing.
Straightforward warranties
Manufacturer parts warranty plus our workmanship guarantee, in writing, before the job starts.
What's Included
Complete hvac installation service, one visit.
A representative list of the work that falls under hvac installation at McCall's. If it's not on the list, ask — we probably do it anyway.
- Full AC & furnace replacements
- Heat pump & dual-fuel installations
- High-efficiency & variable-speed systems
- Air handler & evaporator coil replacement
- Line set & refrigerant line replacement
- Ductwork modifications & sealing
- Smart thermostat setup
- Old equipment removal & haul-away
How It Works
A simple, transparent process — no surprises.
- I
In-Home Assessment
We inspect ductwork, insulation, and existing equipment and talk through what's working and what isn't.
- II
System Design & Quote
You get 1–3 clearly written options at different efficiency levels, with side-by-side pricing.
- III
Installation Day
Typically one day for a full replacement. We remove old equipment, install new, tighten ductwork connections, and pressure-test.
- IV
Startup & Walk-Through
We verify airflow, refrigerant charge, and temp splits, then show you the thermostat, filter location, and maintenance schedule.
Service Area
HVAC Installation across
Marietta & metro Atlanta.
McCall's provides hvac installation for homeowners across Cobb County and the surrounding metro Atlanta area, including:
MariettaKennesawSmyrnaAcworthPowder SpringsAustellMabletonRoswellSandy SpringsWoodstockAtlanta
Frequently Asked
HVAC Installation questions,
answered honestly.
How long does a full system replacement take?
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Most residential AC and furnace replacements are completed in a single day. Heat pump conversions or duct modifications can push into a second day.
What size system do I need?
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Not just square-footage math. We look at insulation, windows, ductwork, and existing performance to size correctly. Oversized systems short-cycle, run humid, and wear out fast — bigger is not better.
Do you offer financing?
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Yes — we can walk you through financing options at the quote appointment so you can choose the efficiency tier that actually fits the budget.
How long should a new HVAC system last?
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Well-installed and maintained systems typically run 12–18 years in Georgia's climate. Clean installation and annual maintenance are the biggest factors.
Other Services
Explore everything we handle.
01
AC Repair
Fast, reliable air-conditioning repair — diagnosed, explained, and fixed right the first time, even in peak Georgia summer.
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Emergency AC Repair
When the system goes down at the worst time, neighbors call McCall's for responsive, same-day emergency cooling support.
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Heating & Furnace Repair
Pre-winter inspections, tune-ups, and repairs to keep your furnace and heat pump running safely through the cold months.
Explore Heating & Furnace RepairNeed hvac installation in Marietta? Let's get you scheduled.
Open every day, 8 AM – 10 PM. Honest pricing. A locally owned team you can actually reach.