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Everything you need to know about whole home standby generators — sizing, cost, brands, and value.
If you're shopping for a whole home standby generator, you've almost certainly narrowed it down to two brands: **Generac and Kohler**. They dominate the residential generator marke...
If you're considering a whole home standby generator, you're probably thinking about it from a comfort and safety perspective — keeping the lights on, the AC running, and your fami...
Choosing the wrong size generator is the most expensive mistake a homeowner can make....
Answer 12 questions and get a real installed price in about 3 minutes.
⚡ Get My Free Estimate →Generator Specialist | Instant Generator Quote Updated March 2026 | 8 min read
But they're not the same product, and choosing the wrong one for your home can cost you thousands.
In this guide we break down exactly how Generac and Kohler compare across every factor that actually matters — warranty, noise, reliability, cost, and which type of home each is best suited for.
Generac was founded in 1959 in Wisconsin and is the undisputed market leader in residential standby generators. They hold over 70% of the home generator market in the United States and install more than 1,000 units per day nationwide. If you've seen a generator sitting next to a house in your neighborhood, there's a 7-in-10 chance it's a Generac.
Kohler was founded in 1873 — originally as a plumbing company — and entered the generator business in the early 1900s. They're best known for their premium quality across all product lines. Kohler generators are the choice of homeowners who want the best money can buy, full stop.
This is the single biggest differentiator between the two brands.
Generac offers a 12-year warranty — bumper-to-bumper coverage including parts, labor, and service for 12 full years. No other generator dealer in the country offers this level of coverage.
Kohler offers a standard 5-year manufacturer warranty covering parts and labor.
The math here is simple. A 12-year warranty vs a 5-year warranty on equipment that costs $13,000–$17,000 is not a small difference. Generator repairs can run $500–$2,500 depending on the component. Over 12 years that warranty can be worth $1,500–$3,000 in protected value.
Winner: Generac — it's not close.
Both brands are dramatically quieter than older generator technology, but there is a measurable difference.
Generac Guardian Series: 62 decibels at 23 feet Kohler Air-Cooled: 70 decibels at 23 feet
For context, 62 decibels is roughly equivalent to a normal conversation. 70 decibels is closer to a vacuum cleaner.
The difference of 8 decibels may not sound like much, but decibels are measured on a logarithmic scale — meaning 70 dB is actually about 2.5 times louder than 62 dB in perceived volume.
If you have neighbors close by, an HOA with noise restrictions, or you simply prefer the quieter unit, Generac wins this category.
Winner: Generac
This is where Kohler earns its premium reputation.
Kohler generators are built with heavier-gauge steel enclosures, tighter tolerances, and components sourced from higher-spec suppliers. The engines in Kohler units are widely regarded as more robust for sustained heavy-load operation — particularly relevant for larger homes with multiple AC units running simultaneously during an extended outage.
Generac units are built to excellent standards — they're the most installed residential generator in America for a reason. But if you're comparing raw material quality side-by-side, Kohler edges ahead.
Winner: Kohler
Generac offers more sizing flexibility, which means you're more likely to get a unit precisely matched to your home's actual load rather than oversizing. Oversizing a generator costs you money upfront and in fuel costs every time it runs.
Winner: Generac — better sizing options for most homes
This is the most practical consideration for most homeowners.
Generac 22kW (most popular): Generator unit $6,189 Kohler 20kW: Generator unit $5,699 Kohler 26kW: Generator unit $7,299
When you factor in the full installed price — transfer switch, electrical, gas connection, permits, pad, labor — a typical whole-home Generac install runs $13,000–$15,500 after the online discount. A comparable Kohler install typically runs $14,500–$17,000.
The price difference narrows on larger jobs but Generac is consistently less expensive for equivalent coverage.
Winner: Generac — meaningfully lower cost
Generac has by far the largest service and parts network in the country. As the market leader with over 6,000 authorized dealers nationwide, parts are readily available and service technicians are everywhere. If something goes wrong, you can get help fast.
Kohler has a solid service network but it's significantly smaller than Generac's. In some markets — particularly rural areas in the Southeast — finding a Kohler-certified technician can take longer than finding a Generac technician.
Winner: Generac — especially important if you're in a secondary market
Both brands add value to your home. The National Association of Realtors estimates whole home generators add approximately 5% to home value.
However, Generac's name recognition among homebuyers is significantly higher. When a realtor lists a home with a "Generac whole home generator" it resonates with buyers more immediately than "Kohler generator" simply because of market share and brand familiarity.
Winner: Generac — by a narrow margin on name recognition
| Category | Winner |
|---|---|
| Warranty | ✅ Generac (12 yr vs 5 yr) |
| Noise Level | ✅ Generac (62 dB vs 70 dB) |
| Build Quality | ✅ Kohler |
| Sizing Options | ✅ Generac |
| Cost | ✅ Generac |
| Parts & Service | ✅ Generac |
| Resale Value | ✅ Generac |
But here's the honest truth: you can't go wrong with either brand. Both Generac and Kohler make excellent whole home generators that will protect your home, start automatically, and run reliably for decades with proper maintenance.
The choice comes down to priorities. If warranty coverage, cost, and parts availability matter most — Generac. If premium build quality is your non-negotiable — Kohler.
The brand is only one part of the equation. The other is sizing — and getting the wrong size is arguably more important than choosing between Generac and Kohler.
An undersized generator will overload and shut down during heavy demand. An oversized generator costs more upfront, burns more fuel, and wears out faster from running at low load.
Use our free online estimate tool to find out exactly which generator — brand and size — is right for your specific home. Answer 12 questions about your home size, AC units, appliances, and fuel type and get a real installed price in about 3 minutes.
No phone call required. No salesperson.
👉 Get Your Instant Generator Estimate — instantgeneratorquote.com
Is Generac or Kohler more reliable? Both brands have excellent reliability records. Generac has a larger installed base which means more real-world data — and their failure rates are consistently low. Kohler's smaller market share makes apples-to-apples comparison harder, but they have an equally strong reputation for reliability among owners.
Which generator is quieter — Generac or Kohler? Generac is quieter. The Generac Guardian Series runs at 62 decibels while Kohler air-cooled units run at approximately 70 decibels. That 8-decibel difference is meaningful in residential neighborhoods.
Does Generac or Kohler have a better warranty? Generac through authorized dealers offers a 12-year bumper-to-bumper warranty — the best in the industry by a wide margin. Kohler's standard warranty is 5 years.
How much more does a Kohler generator cost than a Generac? For a comparable whole-home installation, Kohler typically runs $1,500–$2,500 more than Generac. The Kohler 26kW unit alone is $7,299 vs $6,189 for a Generac 22kW — though these serve slightly different home sizes.
Which brand do most generator installers recommend? Most authorized dealers recommend Generac for the majority of homes due to the superior warranty, lower cost, quieter operation, and larger parts network. Kohler is recommended for customers who specifically want premium build quality and are less cost-sensitive.
Generator Specialist | Instant Generator Quote Updated March 2026 | 8 min read
But there's another angle most homeowners overlook entirely: the financial return.
A whole home standby generator isn't just a home improvement. For many homeowners, it's one of the smartest investments they can make in their property. Here's exactly what the data says — and why the real number may surprise you.
Yes — a whole home standby generator adds measurable value to your home. Independent research and real estate data consistently show increases of 3% to 7% or more in home value, depending on your market, home size, and local power reliability history.
On a $400,000 home, that's $12,000 to $28,000 in added value — often more than the cost of the generator itself.
The data on generator home value is more robust than most homeowners realize:
Consumer Reports found that whole home generators can increase property value by 3 to 5 percent.
The National Association of Realtors has cited generator installations as one of the top home improvements for return on investment in storm-prone and rural markets, with value increases of 5% or more in high-outage areas.
Appraisal Institute members have documented value increases of 3 to 7% on homes with whole home standby generators, particularly in markets where power reliability is a known concern.
Redfin and Zillow listing data consistently shows that homes with whole home generators sell faster and closer to asking price than comparable homes without them — particularly in the Southeast, Mid-Atlantic, and rural markets.
The bottom line: this isn't marketing language. These are documented, measurable increases backed by appraisers, realtors, and independent research organizations.
Not all markets see the same return. The value a generator adds to your home depends heavily on three factors:
In markets with frequent or prolonged outages — coastal areas prone to hurricanes, regions with aging grid infrastructure, rural areas with long utility lines — generators add significantly more value because buyers in those markets understand the risk firsthand.
States like Georgia, Tennessee, South Carolina, Virginia, and Alabama consistently rank among the highest for power outage frequency and duration in the continental US. Homeowners in these markets don't need to be convinced that outages happen — they've lived through them.
In these markets, a whole home generator isn't a luxury. It's increasingly expected by informed buyers.
The value add from a generator scales with home value. On a $250,000 home, a 5% increase is $12,500. On a $700,000 home, that same 5% is $35,000. Larger, more expensive homes see a greater absolute dollar return from generator installations.
Additionally, buyers of higher-value homes are more likely to be researching home features carefully and are more likely to specifically search for generator-equipped properties.
In neighborhoods where multiple homes have generators, a home without one stands out negatively. In neighborhoods where generators are rare, a home with one stands out positively. Either way, having a generator when your neighbors don't is a competitive advantage at sale time.
We spoke with real estate professionals across the Southeast about how generators affect home sales. The consistent message:
Generators help homes sell faster. In competitive markets, buyers who find two comparable homes will often choose the one with a generator — all else being equal — because it eliminates a significant future expense and concern.
Generators reduce price negotiation. Buyers use perceived problems to negotiate price down. A whole home generator removes one of the most common negotiation points — especially in storm markets where buyers are aware of the cost of outages and generator installation.
Generators attract a specific buyer profile. Work-from-home professionals, families with medical needs, homeowners with home-based businesses, and retirees all place high value on reliable power. These buyers are willing to pay a premium for a generator-equipped home and often specifically filter for it.
Generators are increasingly searchable. Real estate platforms now allow buyers to filter for features including backup generators. A home without one doesn't appear in those filtered searches at all.
Here's a simple framework:
Step 1: Get your home's current estimated value (Zillow, Redfin, or a recent appraisal)
Step 2: Apply a conservative 3% increase for your market baseline
Step 3: If you're in a high-outage state (GA, TN, SC, VA, AL, FL, TX, LA) — use 5%
Step 4: If you're in a coastal or rural area with documented frequent outages — use 7%
Example:
| Home Value | 3% Increase | 5% Increase | 7% Increase |
|---|---|---|---|
| $250,000 | $7,500 | $12,500 | $17,500 |
| $350,000 | $10,500 | $17,500 | $24,500 |
| $450,000 | $13,500 | $22,500 | $31,500 |
| $600,000 | $18,000 | $30,000 | $42,000 |
At a 5% return on a $350,000 home, that's $17,500 in added value against a $14,000 installation cost. You're already ahead before you count a single benefit of actually having the generator.
The resale value increase is the most talked-about financial benefit, but it's not the only one.
Both Generac and Kohler are recognized by homebuyers and appraisers as premium brands. In practice, the brand difference has minimal impact on the resale value calculation — both will be recognized as quality installations.
That said, Generac's name recognition is higher due to its dominant market share. In most real estate listings, "Generac whole home generator" resonates more immediately with buyers than "Kohler generator" simply because more people have heard of Generac in the residential context.
For a deeper comparison of the two brands, see our guide: Generac vs Kohler — Which is Better?
Bigger is not always better when it comes to generator sizing — and oversizing does not add proportionally more value.
A properly sized whole home generator that powers every circuit in the house adds full value. An undersized generator that only runs essential circuits adds less value and may actually be a negotiation point for informed buyers.
The most common installation for homes in the 1,500–3,500 sq ft range is a Generac 22kW — which handles whole-home coverage for the vast majority of Southern homes.
Use our free tool to find out exactly what size your home needs and what it will cost installed:
👉 Get Your Instant Generator Estimate — instantgeneratorquote.com
A whole home standby generator adds 3% to 7% or more to your home's value — often more than the cost of the installation itself. In high-outage markets like Georgia, Tennessee, South Carolina, Virginia, and Alabama, that return is at the higher end of the range.
Beyond resale value, generators protect against food loss, medication loss, lost work income, and emergency hotel stays — benefits that add real financial value every time the power goes out.
For most homeowners in the Southeast, a whole home generator is not a luxury. It's a sound financial decision that pays you back both while you live in your home and when you sell it.
Does a generator increase home appraisal value? Yes. Licensed appraisers include whole home standby generators as a value-contributing feature, particularly in markets with documented power reliability issues. The increase typically ranges from 3% to 7% of home value depending on market conditions.
Do home buyers specifically look for generators? Increasingly yes. Real estate platforms now allow buyers to filter for backup generators as a feature. In storm-prone markets like the Southeast, generator-equipped homes are actively sought by buyers who have experienced significant outages.
Does a portable generator add the same value as a standby generator? No. Portable generators add minimal to no appraised value. Only permanently installed whole home standby generators — connected directly to your home's electrical system with an automatic transfer switch — add meaningful resale value.
How long does a whole home generator last? With proper annual maintenance, a whole home standby generator will last 20 to 30 years. This means the investment pays out over decades, not just at resale.
Does generator installation require permits? Yes — and this is actually a good thing for resale value. Permitted installations are documented in public records, which means buyers and their agents can verify the installation was done correctly and up to code. Always use a licensed installer who pulls proper permits.
What is the ROI on a whole home generator? In high-outage markets, the ROI on a whole home generator is frequently greater than 100% when you combine the resale value increase with the financial protection it provides during outages. It is one of the highest-ROI home improvements available to homeowners in storm-prone regions.
Generator Specialist | Instant Generator Quote Updated March 2026 | 9 min read
Too small — and your generator overloads, shuts down, and leaves you in the dark anyway. Too large — and you've paid thousands more than necessary for a unit that runs inefficiently and wears out faster than it should.
The right answer isn't a guess. It's a calculation. And in this guide we're going to walk you through exactly how generator sizing works, what affects it, and what size your home most likely needs.
A standby generator is sized in kilowatts (kW) — a measure of how much electrical power it can deliver at once. Your home has a peak electrical demand based on everything running simultaneously. The generator needs to meet that demand without being overwhelmed.
Here's the problem most homeowners run into: they either estimate too conservatively and end up with a generator that can't handle their actual load, or they take a salesperson's word for it and get oversold on a larger unit they don't need.
Neither outcome is good. Undersizing causes shutdowns. Oversizing causes wet-stacking — a condition where an engine runs at too low a load and builds up unburned fuel in the exhaust system, reducing engine life and reliability.
The goal is precise sizing — a generator matched to your home's actual electrical demand.
Square footage is the starting point for every sizing calculation. Larger homes have more lighting circuits, more outlets, and generally more electrical load — even before you consider AC units or appliances.
Here's a general baseline:
| Home Size | Base Electrical Load |
|---|---|
| Under 1,500 sq ft | ~14 kW base |
| 1,500 – 2,500 sq ft | ~18–20 kW base |
| 2,500 – 4,000 sq ft | ~22–26 kW base |
| Over 4,000 sq ft | ~28 kW+ base |
Air conditioning is by far the largest variable in generator sizing. A central AC unit draws approximately 4–5 kW at startup and 3–4 kW while running. Multiple units multiply that demand dramatically.
This is especially critical for homeowners in Florida, Georgia, South Carolina, Alabama, Mississippi, Louisiana, and Texas — states where summer temperatures routinely exceed 95°F and running without AC during an extended outage isn't just uncomfortable, it can be dangerous for elderly residents and young children.
A home with 1 AC unit needs roughly 4 kW more than the base. A home with 3 AC units needs 12 kW more. This single variable can be the difference between a 22kW and a 26kW generator.
This is the factor most homeowners underestimate. If your major appliances run on natural gas — furnace, water heater, range, dryer — your electrical load is significantly lower than a home where those same appliances are electric.
Homeowners in Minnesota, Wisconsin, South Dakota, Ohio, Kentucky, Virginia, and North Carolina often have electric heat pumps rather than gas furnaces — which significantly affects sizing calculations. Homes with heat pumps use a load management module that intelligently sheds the heat pump load when the generator is under heavy demand, which means the heat pump itself doesn't add to the generator size requirement — but does add to the installation cost.
A home in Tennessee or Arkansas with natural gas for heat, cooking, and hot water needs a meaningfully smaller generator than an identical-sized home in Ohio or Minnesota running on electricity for those same functions.
Beyond the basics, certain equipment adds significant demand that must be accounted for:
Pool pumps are common in Florida, Georgia, Texas, South Carolina, and Alabama — and a standard pool pump draws 2–3 kW continuously.
Well pumps are nearly universal in rural Kentucky, Arkansas, Mississippi, Tennessee, Virginia, and the Carolinas — and a typical well pump draws 2 kW or more.
EV chargers are increasingly common in New York, Virginia, Florida, and Minnesota — and a Level 2 charger draws 7.2–11.5 kW, which can push a borderline sizing calculation to the next generator size.
Medical equipment — home oxygen concentrators, CPAP machines, dialysis equipment — adds minimal electrical load but makes reliable power non-negotiable regardless of size.
Here's how the math works out for common home profiles across our service area:
Recommended: Generac 18kW or 22kW Typical installed cost: $13,000 – $14,500
Recommended: Generac 22kW Typical installed cost: $14,000 – $15,500
This is the most common installation we do — the 22kW covers the vast majority of homes in this profile with room to spare.
Recommended: Generac 24kW The heat pump load shed module manages the heat pump intelligently, but the overall electrical profile of this home pushes it to the 24kW for reliable whole-home coverage.
Typical installed cost: $15,000 – $16,500
Recommended: Generac 24kW Three AC units push this home past the 22kW threshold regardless of fuel type. The pool pump and larger home size confirm the 24kW selection.
Typical installed cost: $15,500 – $17,500
Recommended: Generac 26kW or Kohler 26kW This is the top tier of air-cooled residential generator technology. Homes in this profile have heavy, complex electrical demands that require the largest available air-cooled unit — or a step up to liquid-cooled equipment.
Typical installed cost: $16,500 – $19,000+
One factor that affects installation complexity — though not generator size directly — is your home's electrical service.
200-Amp single panel homes are standard across most of the country and represent the vast majority of installations in states like Tennessee, Arkansas, Kentucky, Mississippi, Alabama, South Carolina, and Georgia.
400-Amp dual panel homes — which have two 200-amp breaker boxes — are more common in larger or newer homes in Florida, Texas, New York, Minnesota, and Ohio. These homes require two transfer switches instead of one, which adds to the installation cost but does not necessarily require a larger generator.
If you're not sure which service your home has, your specialist will confirm during the consultation.
No — generator size is determined by your electrical load, not your fuel type. A 22kW generator running on natural gas and a 22kW generator running on propane deliver identical electrical output.
However, fuel type significantly affects installation cost and logistics. Natural gas homes connect directly to the existing utility line — simple and permanent. Propane homes require a tank, which is typically coordinated through your local propane supplier separately from the generator installation.
Propane installations are most common in rural areas of Arkansas, Kentucky, Tennessee, Mississippi, Wisconsin, South Dakota, and Minnesota where natural gas infrastructure is limited.
The biggest mistake homeowners make is trying to size their own generator based on generic online calculators or manufacturer marketing materials.
Generic calculators use assumptions that may not match your home. Manufacturer materials are designed to sell the largest possible unit.
This is exactly what our free online estimate tool calculates — based on your specific home profile, not a generic template.
Answer 12 questions about your home — square footage, number of AC units, appliances, fuel type, electrical service, and location — and our tool calculates the right generator size for your specific situation along with a real installed price.
We serve homeowners across Arkansas, Tennessee, South Carolina, Georgia, North Carolina, Texas, Alabama, Kentucky, Minnesota, Louisiana, Mississippi, Ohio, Florida, Virginia, New York, South Dakota, and Wisconsin.
No phone call required. No salesperson. Just your number.
👉 Get Your Instant Generator Estimate — instantgeneratorquote.com
What is the most common generator size for a home? The Generac 22kW is the most commonly installed whole home generator in the United States. It covers the vast majority of homes in the 1,500–3,000 sq ft range with standard appliance loads and 1–2 AC units.
Is a bigger generator always better? No. Oversized generators run at low load, which causes wet-stacking — a buildup of unburned fuel in the exhaust system that reduces engine life and reliability. A properly sized generator runs at the right load and lasts longer.
Can a 22kW generator run my whole house? For most homes in the 1,500–3,000 sq ft range with gas appliances and 1–2 AC units, yes. Homes with electric appliances, heat pumps, or 3+ AC units may need a 24kW.
Do I need a bigger generator if I have a heat pump? Not necessarily. Modern installations use a load shed module that intelligently manages the heat pump during high-demand periods, preventing overload without requiring a larger generator. Your installer will size appropriately based on your total load.
How much does generator size affect cost? Moving from an 18kW to a 22kW adds approximately $500–$800 to the total installed price. Moving from a 22kW to a 24kW adds approximately $400–$600. The generator unit itself is only one component of the total cost — installation, transfer switch, permits, and electrical work make up the majority.
Does a larger generator use more fuel? Yes — larger generators consume more fuel per hour at full load. However, since generators only run when the grid is down, annual fuel consumption is typically modest. A 22kW running 100 hours per year on natural gas costs approximately $150–$250 in fuel.
What happens if my generator is too small? An undersized generator will trip on overload when demand exceeds its capacity. It will shut down automatically to protect itself — leaving you without power. In the worst case, chronic overloading can permanently damage the unit.