CUMMINS 20KW GENERATOR COST (RS20A / C20N6H)

RS20A and C20N6H — same generator, two names

RS20A is the consumer-facing model name. C20N6H is the engineering/parts identifier you'll see on the data plate, spec sheet, and parts catalog. Both refer to the same Cummins 20 kW QuietConnect home standby generator. The variant C20N6HC is the same unit bundled with a matched Cummins automatic transfer switch — you'll sometimes see it written as "RS20A combo" or "C20N6HC combo."

Why the 20 kW is Cummins' residential flagship

The 20 kW QuietConnect sits at the top of Cummins' air-cooled residential line. For typical 2,000–3,500 sq ft homes with central AC, a well, kitchen, and electronics, the 20 kW covers whole-home backup without jumping to a much more expensive liquid-cooled RA- or RS-series platform. It's the size most NC and SC homeowners install when they pick Cummins.

Unit cost vs install cost

Total installed cost has two halves: the unit and the install.

Unit price

The Cummins 20 kW (RS20A / C20N6H) is priced in the mid four figures for the unit alone. Live per-model pricing is on the product page: Cummins 20 kW QuietConnect (C20N6H). The bundled-with-ATS SKU is here: Cummins 20 kW with ATS (C20N6HC).

Install price

Same drivers as any standby install — gas line length and meter capacity, electrical run to the panel and ATS, concrete pad, permits and inspection, and distance from panel/meter. A typical residential 20 kW install lands in the low four figures for the install line item; difficult sites, long gas runs, or panel upgrades push it higher. A site-specific quote is the only way to know your number.

What makes the Cummins 20 kW different

• Sound level: rated 65 dB(A) or less at 23 ft (7 m) during normal load — roughly conversational volume. Among the quieter air-cooled units on the market, which matters for pads near bedrooms or property lines.
• Engine: Cummins QSJ999G 999cc V-twin, pressure-lubricated, built for sustained standby duty.
• Clean power: less than 5% total harmonic distortion — safe for sensitive electronics.
• Warranty: 5-year / 2,000-hour limited — 5 years parts, 2 years labor and travel — through Cummins' authorized service network.
• Compact: certified for installation as close as 18 inches from the home.
• Fuel-flexible: installer-selectable between natural gas (18 kW rating) and LP (20 kW rating).

Bundle with ATS (C20N6HC) or unit only (C20N6H)?

For most whole-home installs, bundle. The C20N6HC kit pairs the 20 kW QuietConnect with a matched Cummins automatic transfer switch from the RA series — the ATS is sized, programmed, and warrantied together with the generator. It's typically meaningfully cheaper than buying the two SKUs separately.

Pick the unit-only C20N6H if you already have a working transfer switch, need a non-standard amperage, or are working with a complex panel arrangement that your installer wants to spec individually.

0% APR financing

0% APR financing is available on qualifying Cummins 20 kW orders. Most homeowners use it to bundle the ATS (C20N6HC) or to pair the generator with a service plan without changing their monthly budget. See current terms on the financing page.

Related guides

• Whole-house generator cost
• Generac 22 kW generator cost — direct comparison-shopper guide
• Generac vs Cummins
• Do I need a transfer switch?

Not sure the 20 kW is the right size? Run the free 60-second sizing calculator or jump to a free installed quote.

FAQ

Is the Cummins RS20A the same as the C20N6H?

Yes — RS20A and C20N6H refer to the same Cummins 20 kW QuietConnect home standby generator. RS20A is the consumer-facing model name; C20N6H is the engineering/parts identifier. You'll see both in dealer literature, on the spec sheet, and on the unit data plate. The C20N6HC suffix means the same generator bundled with a matched Cummins automatic transfer switch.

How much does the Cummins 20 kW cost?

The Cummins 20 kW (RS20A / C20N6H) unit is priced in the mid four figures for the unit alone. Live per-model pricing — including any active promotions and ATS bundle options — is on the product page. Total installed cost adds the install line item, which is site-specific (gas, electrical, pad, permits).

How quiet is the Cummins 20 kW really?

Cummins rates the 20 kW QuietConnect at 65 dB(A) or less at 23 ft (7 m) during normal load operation — roughly the level of normal conversation at arm's length. That makes it one of the quieter air-cooled residential standby generators on the market, which matters if the pad will be near a bedroom window or close to a neighbor.

What's covered under the Cummins warranty?

The 20 kW QuietConnect (RS20A / C20N6H) is backed by a 5-year / 2,000-hour limited warranty — 5 years parts coverage with 2 years labor and travel — when installed by an authorized dealer. We're factory-authorized, which means your warranty is registered correctly and serviced through Cummins' nationwide network.

Should I bundle the transfer switch?

For most whole-home installs, yes. The C20N6HC bundle includes a matched Cummins automatic transfer switch (RA-series) and typically costs less than buying the two SKUs separately. Matched ATS install is cleaner, the warranty is registered together, and you avoid compatibility questions. Skip the bundle only if you already have a working ATS or need a non-standard configuration.