Charlotte gets more power outages than most homeowners expect. Between hurricane season, inland tropical storms, and winter ice, losing power for more than a day isn’t rare in the metro area. A whole-home standby generator keeps your lights on, your HVAC running, and your family comfortable when the grid goes down. Here’s what it costs, how to choose between Kohler and Generac, and what installation looks like.
Want to get started right away? Visit our whole-home generator installation page to learn more about what we offer.
Why Charlotte Homeowners Are Installing Standby Generators
The Charlotte area sits far enough inland that most homeowners don’t think of it as storm territory, but the remnants of major hurricanes track through the Carolinas most seasons. When Hurricane Helene came through in September 2024, Duke Energy reported restoring power to more than 1.1 million Carolinas customers in the first 48 hours alone. Winter ice brings down lines across Mecklenburg and the surrounding counties too.
A two-hour outage is manageable. A 72-hour outage in July heat is a different problem. For homes with medical equipment, elderly residents, or anyone who can’t safely go without heating or cooling, a generator is a practical safety decision, not a luxury upgrade. Standby generators are built for the long outages, the ones where a portable unit would run out of fuel and need constant attention to keep going.
Standby Generator vs. Portable Generator: Which One Is Right for You?
Portable generators are cheaper up front, but there are obvious trade-offs. You have to be home to start them. They run on gasoline, which runs out. They can only power a handful of circuits through extension cords, and you can’t safely run one inside or directly against the house.
A standby generator is permanently installed outside your home and connected to your natural gas or propane supply. It monitors utility power continuously and switches on automatically within seconds of an outage. You don’t have to do anything. If you’re traveling when the storm hits, your home stays protected.
For most Charlotte-area homeowners who want reliable whole-home coverage, the standby option makes the most practical sense once you look at the long-term picture.
How Much Does a Whole-Home Generator Cost in Charlotte, NC?
Andersen Heating & Cooling’s published prices for a whole-home standby generator run from $15,000 to $27,000 in three tiers. Small Demand runs $15,000 to $18,000, Medium Demand $16,500 to $19,200, and Large Demand $17,800 to $27,000. National cost guides quote lower floors: HomeGuide’s 2026 guide puts the average whole-house generator at $6,000 to $11,000 installed, rising to $9,500 to $24,000 for units over 20 kW or installs with long wiring and gas runs. Those are national averages across every size and brand. The tiers below are what Andersen charges, and the free site assessment tells you which one fits your home.
| Andersen price tier | Published price |
|---|---|
| Small Demand | $15,000 to $18,000 |
| Medium Demand | $16,500 to $19,200 |
| Large Demand | $17,800 to $27,000 |
Source: Andersen’s HVAC and generator pricing page.
What Decides Which Tier You Land In
Andersen’s pricing page lists five factors behind a generator price:
- Electric load: how much power the house draws, with central air as the largest single load in a Charlotte summer.
- Gas line location: how far the line has to run from your meter to the generator pad.
- Fuel type: natural gas or propane.
- Electrical configuration: your panel and meter, and whether either needs work to accept a transfer switch.
- Your backup requirements: whether you want the whole home covered or only essential circuits.
A complete installation includes more than the generator itself: the automatic transfer switch, a concrete pad, the gas line connection, the electrical hookup to your panel, permits, and labor. That’s why a unit price you find online is never the number you’ll pay. HomeGuide lists the generator alone at $3,000 to $6,000 on average, with installation another $3,000 to $5,000 before longer runs or larger units.
We provide upfront pricing after a free site assessment. There are no estimates that change once the job starts.
Financing Options
A generator is a significant purchase. We offer financing options that let you spread the cost over time without delaying the installation. Planning the install before you need it, rather than right after an outage, keeps the decision from feeling rushed.
Kohler or Generac: Which Should You Choose?
Andersen Heating & Cooling installs Kohler standby generators exclusively, so we’re not a neutral party, but the main differences between the two brands are published by the manufacturers and easy to check. Both advertise a 5-year/2,000-hour limited warranty. What that warranty covers differs. Kohler’s standard warranty “covers defects in materials and workmanship, including labor, travel and parts” for the full term. Generac’s posted 5-year limited warranty covers parts, labor and limited travel in years one and two, parts only in year three, and only major engine and alternator components in years four and five. The two brands also publish different maintenance intervals.
| Kohler | Generac | |
|---|---|---|
| Standard warranty | 5 years / 2,000 hours | 5 years / 2,000 hours |
| Years 1-2 | Parts, labor, travel | Parts, labor, limited travel |
| Year 3 | Parts, labor, travel | Parts only |
| Years 4-5 | Parts, labor, travel | Engine short block and alternator only |
| Travel limit | Not stated on Kohler’s warranty page | 100 miles or 3 hours round trip |
| Extended coverage | Up to 10 years through a certified dealer | Not compared here |
| Recommended service | At least once a year, even if it never ran | Every 200 hours or 2 years |
Sources: Kohler’s warranty page and maintenance schedule; Generac’s warranty statement and Schedule A maintenance.
Where Generac Has the Edge
Generac is the bigger brand. HomeGuide calls it “the leading brand in whole-home generators” and lists its 20 kW and 22 kW units at about $4,500 to $5,000 before installation. More installers carry it, and parts are easy to find. Its two-year service interval also means fewer scheduled visits than Kohler’s annual one.
Why We Chose Kohler
We’ve evaluated the available options and install Kohler standby generators exclusively. Beyond the warranty, a few Kohler features matter specifically in Charlotte homes:
- Automatic transfer switch. Kohler’s switch monitors your utility line continuously and starts the generator within seconds of an outage. No one needs to be home.
- PowerBoost technology. Starting a central air compressor draws far more current than running it. Kohler’s PowerBoost manages those large load starts, including AC compressors and pump motors, so the startup surge doesn’t cause voltage drops or nuisance trips.
- Remote monitoring. The KOHLER Energy Management app shows generator status, run history, and alerts from anywhere. For Lake Norman properties or anyone who travels often, you’ll know whether the generator ran during a storm before you get home.
One condition to know about: Kohler’s standard warranty requires the generator to be registered by a certified installer or dealer. Confirm the registration is done when your installation is finished.
If you already own a Generac, follow Generac’s own service schedule. Kohler’s annual interval applies to Kohler units.
What Size Generator Does Your Charlotte Home Need?
Generator size takes a real load assessment rather than an online guess. The wrong size is expensive in both directions: undersized and you lose air conditioning in the middle of a July outage; oversized and you’ve paid for capacity you’ll never use.
Essential Circuits vs. Whole-Home Coverage
Essential circuit coverage (typically 11 to 16 kW) keeps your refrigerator, a few lights, and some outlets running. It costs less but won’t power central air conditioning. For most Charlotte homeowners, that trade-off isn’t acceptable in summer. Whole-home coverage (typically 16 to 22 kW for most homes in our service area) runs everything, including your HVAC system, water heater, and all appliances at once.
The right choice depends on your home’s size, your HVAC equipment, and whether anyone in the household depends on powered medical equipment.
How Andersen Sizes Your System
Our process starts with a load assessment. A technician visits your home, catalogs your electrical demand, and calculates exactly what output you need. We factor in your HVAC system size specifically, because running central air during a Charlotte summer is the largest load variable in the calculation. If you’re also replacing an aging furnace or heat pump, it’s worth sizing both projects together, since the new equipment changes the load. There’s no charge for the assessment, and it gives you an accurate number and a price tier rather than a range.
If you’re already enrolled in our HVAC maintenance program, we can coordinate the assessment alongside your next scheduled visit.
What the Generator Installation Process Looks Like
A standby generator installation involves multiple trades working in sequence. Knowing the steps in advance makes the process easier to plan for.
Site Survey and Sizing
The first visit is the assessment described above. We confirm generator placement (local codes require minimum clearance from windows, doors, and gas meters), evaluate the gas line run, and review your panel. This is also when we finalize the equipment specification and give you a firm price.
Permits in Charlotte and Surrounding Areas in Mecklenburg County
Every standby generator installation in Mecklenburg County and the surrounding municipalities requires permits covering the electrical work, gas line connection, and final inspection. We pull all permits and manage the scheduling with the county. You don’t need to coordinate with the inspector or file any paperwork yourself. The same applies to installations in Mooresville, Gastonia, Fort Mill, Huntersville, and Cornelius.
What Happens on Installation Day
Most residential installations in the Charlotte area are complete in one to two days. Day one typically covers site prep and the concrete pad. Gas line and electrical work follow once the pad is set. The automatic transfer switch is wired into your main panel, final testing is completed, and the inspector signs off. We walk you through how the system operates before we leave.
Once your generator is in, Kohler recommends professional service at least once a year. Our guide to standby generator maintenance covers what that visit includes and what it costs. To learn more about what we install and service, visit our whole-home generator installation page.
Choosing a Generator Installer in Charlotte: What to Look For
Most generator installation companies in Charlotte are electricians. That’s appropriate for the electrical side of the work. But a whole-home generator needs to be sized to run your HVAC system, and that takes someone who understands HVAC load requirements, not just panel capacity.
Look for an installer who holds proper licensing and brings both electrical and HVAC knowledge to the project. Ask whether they handle permitting or pass that to you. Ask for references from completed installations in the same county, since code requirements vary. Request an itemized quote that separates equipment, labor, gas line work, and permits. A number that lumps everything together is harder to verify and harder to compare. And ask which warranty the brand carries in years three through five, since that’s where the two major brands differ.
We’ve been in the Charlotte market since 1984. A generator is a permanent addition to your home. You want it installed by someone who’ll still be here when you need service five or ten years from now.
Frequently Asked Questions About Generator Installation in Charlotte
How much does a whole-home generator cost in Charlotte, NC?
Andersen Heating & Cooling’s published generator prices run from $15,000 to $27,000 in three tiers: Small Demand $15,000 to $18,000, Medium Demand $16,500 to $19,200, and Large Demand $17,800 to $27,000. The tier depends on your home’s electric load, the gas line run, fuel type, your panel and meter, and how much of the home you want covered. National guides quote lower averages, such as HomeGuide’s $6,000 to $11,000 installed, because they average every size and brand. We give you a firm price after a free site assessment.
Is Kohler or Generac better for a Charlotte home?
Andersen Heating & Cooling installs Kohler exclusively, and the biggest published difference between the two brands is the warranty. Both advertise 5 years or 2,000 hours, but Kohler’s covers parts, labor and travel for the full five years, while Generac’s drops to parts only in year three and major engine and alternator components in years four and five. Generac units usually cost less up front and need service every two years instead of every year. If you already own a Generac, follow Generac’s maintenance schedule.
What size generator do I need for my Charlotte home?
Most homes in the Charlotte area need between 16 and 22 kW for whole-home coverage. The right size depends on your square footage, HVAC system size, and whether you want to power everything or just essential circuits. We do a load assessment at no charge to give you an accurate recommendation before any purchase decision.
How long does standby generator installation take?
Most residential installations in the Charlotte area are complete in one to two days. That includes setting the unit, pouring the concrete pad, connecting to your natural gas or propane line, installing the automatic transfer switch, and final inspection. We handle all permits with Mecklenburg County.
Does my Charlotte home need a permit for a standby generator?
Yes. Mecklenburg County and the surrounding municipalities require permits for standby generator installations, covering the electrical work, gas line connection, and final inspection. We pull the permits and manage the process. You don’t need to coordinate with the county.
Can a standby generator run my air conditioning in Charlotte?
Yes, if the generator is sized correctly. Running central AC through a summer outage takes enough kW capacity to handle the compressor’s startup load. Kohler’s PowerBoost technology helps manage that startup demand. We size every system to support your HVAC equipment.
If you’re ready to get a number or just want to understand your options, we can start with a free site assessment and load calculation. No pressure and no commitment. Call Andersen Heating and Cooling at (704) 596-2525 or request service online. We’re available seven days a week, 7:30 a.m. to midnight.
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