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Whole House Generator Cost Calculator

Equipment vs installed — the $7,000 gap the industry hopes you won't notice, priced line by line.

Quick answer

A whole-house standby generator costs $8,000–$16,000 installed in 2026. A 22kW Generac — the most popular size — runs about $7,369 for the equipment plus $4,000–$8,000 for gas line, transfer switch, pad, permits, and labor, averaging ~$13,800 installed.

Calculator

How it works

Equipment + install components

Equipment uses 2026 Generac catalog pricing with transfer switch (10kW $4,619 → 26kW $8,219). Install: gas line $1,500–$3,500, electrical $1,000–$2,500, permits $500–$1,500, pad $500–$1,000, labor $2,500–$4,000. Propane adds ~$1,800; panel work adds $1,750–$4,150.

The equipment/install split

The unit is typically 50–60% of the total — the rest is fuel, electrical, permits, and labor. Quotes that blur this line are hiding margin.

Worked example

22kW Generac, natural gas, panel ready:

Equipment = $7,369

Install ≈ $6,000

Total = $13,369

Range: $11,000 – $15,000 installed.

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The generator industry's favorite trick is quoting equipment prices as installed prices. A "$7,000 Generac" becomes $14,000 once the gas line, transfer switch, pad, permits, and electrician are added — and every one of those line items is negotiable scope, not fixed cost.

This calculator separates equipment from installation using 2026 Generac catalog pricing and real installer quote breakdowns, so you can see exactly where your $13,000 goes — and which line items to challenge.

How to size a whole-house generator

  1. List must-run loads: fridge (~800W), furnace fan (~800W), sump pump (~1,000W), lights, well pump (~2,000W).
  2. Add the big one: central A/C needs ~4,500W running but 12,000W+ starting surge.
  3. Pick the kW tier that covers running watts with headroom for the largest surge: 22kW fits most 2,000–3,000 sq ft homes.
  4. Confirm fuel: natural gas is cheapest to run; propane needs a tank (250–500 gal) and adds ~$1,800.

Whole-house generator (2026 US, Generac Guardian w/ transfer switch)

SizeEquipmentTypical installed totalCovers
10 kW$4,619$8,500–$11,000Essentials only
14 kW$5,949$10,000–$13,000Essentials + 1 A/C zone
18 kW$6,769$11,500–$14,500Most of 2,000 sq ft home
22 kW$7,369$11,000–$16,000Whole home + central A/C
24–26 kW$7,789–$8,219$14,000–$18,000Large home / dual HVAC
Install components—$4,000–$8,000Gas, electric, permits, pad, labor

2026 pricing. Sources: udpwr.com (Generac catalog), powerupgen.com, wearesalt.org (installer quotes).

Worked example: 22kW Generac, natural gas, panel ready

22kW Generac Guardian, natural gas, no panel upgrade:

  1. Equipment: $7,369 (unit + automatic transfer switch).
  2. Install mid: $6,000 (gas $2,500 + electrical $1,750 + permits $1,000 + pad $750).
  3. Total: ~$13,400 mid; range $11,000–$15,000.
  4. Annual: +$200–$300 maintenance, fuel per outage hour.

~$13,400 installed for a 22kW whole-home Generac — right at the national 12-quote average of $13,800.

Pro tips for generator installation

  • Get 3 quotes minimum — installed prices for the same 22kW unit vary $4,000+ between dealers.
  • Ask whether the transfer switch is included: "equipment-only" quotes often exclude the $1,000–$2,000 switch.
  • Size for surge watts, then add 20% headroom — an undersized generator that stalls on A/C startup helps nobody.
  • Confirm the gas meter can handle the added load — upsizing the meter is the utility's job but your delay.
  • Register the warranty within 30 days and keep up the exercise cycle — most failures are dead batteries, not engines.

How to use the whole-house generator cost calculator

Pick the generator size in kW (22kW covers most 2,000–3,000 sq ft homes), your fuel type, and whether your electrical panel needs work. The calculator adds 2026 Generac equipment pricing to realistic install components — gas line, transfer switch, pad, permits, and labor.

How generator cost is calculated

Total = equipment + install. Equipment (Generac with transfer switch, 2026): 10kW $4,619 → 26kW $8,219. Install: gas line $1,500–$3,500, electrical $1,000–$2,500, permits $500–$1,500, pad $500–$1,000, labor $2,500–$4,000 — roughly $4,000–$8,000 total. Propane adds ~$1,800 for tank and lines; panel upgrades add $1,750–$4,150.

What drives generator cost the most?

Size is the equipment lever, but installation is where quotes diverge — a long gas run or a panel upgrade can add $5,000+ to an otherwise standard job. The quote-trap: "equipment-only" prices that exclude the transfer switch, which alone runs $1,000–$2,000 installed.

Generator cost example: 22kW Generac

22kW Generac Guardian, natural gas, panel ready: $7,369 equipment + ~$6,000 install (gas line $2,500, electrical $1,750, permits $1,000, pad $750) = ~$13,400 mid, ranging $11,000–$15,000. Add propane (+$1,800) or a panel upgrade (+$4,150) as needed.

Standby vs portable: the honest comparison

A portable generator with manual transfer inlet costs $800–$2,000 all-in vs $8,000–$16,000 for automatic standby. Portables need refueling every 8–12 hours, can\'t run unattended, and won\'t power hardwired 240V loads cleanly. If outages are rare and short, portable wins on economics; if they\'re frequent or you have medical equipment, sump pumps, or work from home, standby earns its premium.

Frequently Asked Questions

How much does a whole-house generator cost in 2026?+
A professionally installed whole-house standby generator costs $8,000–$16,000 all-in in 2026. A 22kW Generac — the most popular size — runs about $7,400 for the equipment plus $4,000–$8,000 for gas line, transfer switch, pad, permits, and labor.
What size generator do I need for my house?+
Rule of thumb: 10kW covers essentials (fridge, lights, furnace fan, sump pump); 14–18kW adds one A/C zone; 22–26kW covers a typical 2,000–3,000 sq ft home including central air. Two HVAC systems or electric heat push you to 26–32kW. Size by starting (surge) watts, not running watts.
How much does it cost to install a Generac 22kW generator?+
A Generac 22kW Guardian averages about $13,800 installed (2026 quotes). The unit itself lists around $7,369 with transfer switch; the rest is gas line ($1,500–$3,500), electrical and panel work ($1,000–$2,500), permits ($500–$1,500), pad ($500–$1,000), and labor ($2,500–$4,000).
Is a whole-house generator worth it?+
It depends on outage frequency and what outages cost you. At $8,000–$16,000 installed plus $200–$300/year maintenance and fuel, it rarely "pays back" financially — it buys continuity: no spoiled food, working sump pump, medical equipment, and remote-work uptime. In storm-prone areas with frequent multi-day outages, most owners say yes.
How much does it cost to run a whole-house generator?+
A 22kW unit burns roughly 2–3 gallons of propane per hour at full load (less on natural gas, billed by therms). Annual maintenance — oil, filters, plugs, inspection — runs $200–$300. Budget a full-load test monthly; most units self-exercise weekly.
Do I need a permit to install a standby generator?+
Yes — electrical and gas permits are required nearly everywhere, typically $500–$1,500 total. Many jurisdictions also require setback from property lines and noise compliance. Your installer should pull all permits; if a quote says "permits excluded," add $1,000+ mentally.

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