How much does a Cummins RS20A cost installed?

$9,000–$12,500 turnkey installed per the dataset's reported band — the unit ($5,800–$6,200), the 200A service-entrance ATS (RS20AC bundle $6,600–$7,400), electrical work, gas plumbing, site prep, and permits included.

How much is the Cummins RS20A unit itself?

About $6,000 — a reported range of $5,800–$6,200 unit-only, or $6,600–$7,400 with the 200A service-entrance ATS (RS20AC) (dealer/retailer listings, low-confidence aggregate).

How much does the Cummins QuietConnect RS20A Standby Generator cost installed?

Expect roughly $10,750 installed, including the unit, automatic transfer switch, electrical work, gas plumbing, and site prep. Your local quote varies with the length of the gas and electrical runs and any panel upgrades.

Is the Cummins QuietConnect RS20A Standby Generator enough to power a whole house?

Flagship air-cooled whole-home standby generator, 20 kW on LP / 18 kW on natural gas; RS20AC adds a 200A service-entrance ATS. Whole-house coverage depends on your load calculation; a licensed installer will size it against your panel and largest appliances.

What does the Cummins QuietConnect RS20A Standby Generator cost to run?

Running cost depends on fuel and load. On natural gas, expect roughly $20–$60 per day of continuous operation for an air-cooled unit, plus a few dollars a month for weekly self-tests and $200–$500 a year for maintenance.

Cummins QuietConnect RS20A Standby Generator cost & price guide

Updated September 2026

Standby generator installed beside a home

The Cummins QuietConnect RS20A runs about $6,000 for the unit — a reported range of $5,800–$6,200 — with the 200A service-entrance ATS version (RS20AC) at $6,600–$7,400. This is one of the few model rows where the dataset records a real turnkey band: turnkey installed runs $9,000–$12,500, covering the ATS, electrical work, gas plumbing, site prep, and permits. Cummins positions QuietConnect on quiet operation and long service intervals.

What you should expect to pay

MSRP: Not published
Unit (est.): $6,000
Installed (est.): ~$10,750
90-day low: —

Unit-only range reported $5,800-$6,200 (midpoint 6,000). Unit + 200A service-entrance ATS (RS20AC) $6,600-$7,400. Turnkey installed $9,000-$12,500.

Confidence: low · Data as of 2026-09-17

MSRP: Not published
Unit (est.): $6,000 (range $5,800–$6,200)
Unit + 200A ATS (RS20AC): $6,600–$7,400
Installed (est.): $9,000–$12,500 turnkey
90-day low: $5,800
Confidence: low · Data as of 2026-09-17

Cost to install

Installation is what turns the unit price into a working standby system: the automatic transfer switch (the RS20AC service-entrance bundle runs $6,600–$7,400), the electrical work between switch and panel, the gas plumbing run, the concrete pad and site prep, and the municipal permit. The dataset's turnkey band for this model is $9,000–$12,500 installed; complex installs with panel upgrades or long gas runs quote higher per site.

Reported prices

$5,800 (low) — Unit only, low end.
$10,750 (other) — Turnkey installed midpoint ($9,000-$12,500).

Observation row cummins-rs20a (typical_street 6,000; sources: Outbound Power, Norwall, eDirect, Cummins cost guide).

Specs

Rated Output Kw: 20
Rated Output Kw Ng: 18
Fuel Options: natural gas, liquid propane
Cooling: air-cooled
Transfer Switch A: 200
Cold Start F: -40

Where to buy

Electric Generators Direct — Specialist retailer, broad air- and liquid-cooled stock
Home Depot — Generac and other air-cooled models, often in stock
Lowe's — Generac and Briggs & Stratton, in-store pickup
Generac (manufacturer) — Find a certified dealer for installed quotes

Frequently asked questions

How much does a Cummins RS20A cost installed?: $9,000–$12,500 turnkey installed per the dataset's reported band — the unit ($5,800–$6,200), the 200A service-entrance ATS (RS20AC bundle $6,600–$7,400), electrical work, gas plumbing, site prep, and permits included.
How much is the Cummins RS20A unit itself?: About $6,000 — a reported range of $5,800–$6,200 unit-only, or $6,600–$7,400 with the 200A service-entrance ATS (RS20AC) (dealer/retailer listings, low-confidence aggregate).
How much does the Cummins QuietConnect RS20A Standby Generator cost installed?: Expect roughly $10,750 installed, including the unit, automatic transfer switch, electrical work, gas plumbing, and site prep. Your local quote varies with the length of the gas and electrical runs and any panel upgrades.
Is the Cummins QuietConnect RS20A Standby Generator enough to power a whole house?: Flagship air-cooled whole-home standby generator, 20 kW on LP / 18 kW on natural gas; RS20AC adds a 200A service-entrance ATS. Whole-house coverage depends on your load calculation; a licensed installer will size it against your panel and largest appliances.
What does the Cummins QuietConnect RS20A Standby Generator cost to run?: Running cost depends on fuel and load. On natural gas, expect roughly $20–$60 per day of continuous operation for an air-cooled unit, plus a few dollars a month for weekly self-tests and $200–$500 a year for maintenance.

Related guides

Whole-house standby generator cost — the standby hub: unit and installed cost at a glance, cost drivers, and model-by-model comparisons.
Roof replacement costs — installed cost per square for asphalt, metal, and tile roofs, plus tear-off and pitch.
Roof replacement cost calculator — estimate your own roof by size, material, tear-off layers, pitch, and stories.
Driveway & concrete flatwork costs — asphalt, concrete, and paver pricing per square foot; the same flatwork family as the poured pad your standby unit sits on.

Sources

Outbound Power - Cummins RS20A 20kW air-cooled standby (medium reliability)
Norwall PowerSystems - Cummins QuietConnect RS20AC / RS25 (medium reliability)
Electric Generators Direct - Cummins standby generator (medium reliability)
Cummins - How much does a home standby generator cost? (high reliability)

About this data

Prices are aggregated from public dealer and retailer listings and are indicative, not quotes. Manufacturers often do not publish MSRP for dealer-installed equipment.