Buying Decision
Is a Whole-House Generator Worth It?
The honest answer is: it depends on three things — how often your power actually goes out, what you’re protecting when it does, and how long you’ll stay in the home. Here is the real 20-year cost, the value on the other side of the ledger, and a framework to decide.
What it costs to get in
A 22kW Generac Guardian — the right size for most Chicago-area homes — installed starts around $12,000 for a standard whole-home job, plus a permit. Some homes need one-time site work on top — a 200A panel upgrade ($1,800–$3,000), a long gas run, or difficult pad access — which is why the cost guide breaks the drivers out. That upfront number is the biggest single cost of ownership; almost everything after it is small by comparison.
The 20-year cost of ownership
Air-cooled standby generators typically last 15–25 years with proper maintenance, so 20 years is a fair window. Here is what a typical 22kW whole-home unit costs across that span — ranges, not false precision.
| Cost category | Cadence | 20-year | Notes |
|---|---|---|---|
| Equipment + standard install (22kW whole-home) | once | ~$12,000 | Chicago-area starting price; equipment, labor, transfer switch, standard site conditions. |
| Permit + inspection | once | ~$85–$435 | Varies by municipality (e.g. Naperville $85; DuPage unincorporated $295–$435). |
| Maintenance (dealer plan or annual service) | $150–$400 / yr | $3,000–$8,000 | Dealer plans commonly $175–$300/yr; oil, filters, plugs, battery, ATS test. |
| Fuel (weekly exercise + outage hours) | usually $10–$60 / yr | ~$200–$1,200 | Small because the unit runs few hours a year — see the worked example below. |
| Post-warranty repairs + battery (yrs 6–20) | occasional | ~$1,000–$3,000 | Batteries every ~3–5 years plus the odd part after the 5-year warranty. Estimated. |
| 20-year total (base, no major site upgrades) | ~$16,000–$25,000 | Roughly $800–$1,250 per year of whole-home standby protection. |
Install price: Chicago-area starting cost (see cost guide). Maintenance $150–$400/yr: Angi 2026 whole-house generator maintenance data + published dealer plan pricing. Lifespan 15–25 years and post-warranty repair/battery costs: multiple installer/industry sources [OBSERVED]. Repair and fuel lines are estimates, labeled as such.
Why fuel is the smallest line item
The common fear is that a standby generator is expensive to run. It isn’t — because it runs so little. At heavy load a unit this size burns roughly 300 cubic feet of natural gas per hour (about 3 therms). At Nicor’s residential gas-supply rate — which ran about $0.36–$0.54 per therm across 2025–2026, with delivery on top — that is on the order of $1.50–$2.50 per hour at heavy load.
But the unit only runs a brief weekly exercise cycle (minutes) plus whatever outage hours your year actually brings. A quiet year costs a few dollars; only a long multi-day outage adds up — and in that outage the generator is doing exactly what you bought it for. For live prices, check Nicor; the fuel-vs-power tradeoff is covered on our natural gas vs. propane page.
Consumption ≈ verified spec-sheet figures (Generac 24kW 306 cfh; Kohler 26RCA 290 cfh). Gas rate: Nicor Gas / Citizens Utility Board 2025–2026. Runtime is illustrative, not a fixed cost.
The other side of the ledger
ROI on a generator isn’t a stock return — it’s avoided loss and avoided misery. In the Chicago suburbs, the biggest number is usually the one nobody quotes: a flooded basement.
Sump pump & basement flooding
The single most valuable thing a generator protects here. DuPage and Will County clay soils push water against foundations, and the storms that knock out power are the same storms that flood basements — the City of Naperville itself recommends backup power for sump pumps. One finished-basement flood can cost far more than a year of the generator. Exposure is very local: the Salt Creek corridor is why Elmhurst built the Elmhurst Quarry flood-control facility and why flooding around Graue Mill is a recurring problem in Hinsdale.
Food safety
USDA/FSIS guidance: refrigerated food is unsafe after about 4 hours without power, and a full freezer holds roughly 48 hours (24 if half-full). A single multi-day outage can spoil hundreds of dollars of food.
Frozen pipes, medical needs, remote work
A winter outage can freeze and burst pipes; a home medical device or a work-from-home income can’t wait on ComEd’s restoration queue. These are the outages where a generator stops being a convenience and becomes essential.
Resale value
National resale studies (Remodeling magazine’s Cost vs. Value work) put recovery at roughly two-thirds of a standby generator’s installed cost, with higher recovery in outage-prone markets. It won’t pay for itself at closing, but it recovers a meaningful share and is a genuine listing feature here.
Food-safety windows: USDA Food Safety and Inspection Service. Resale recovery: Remodeling magazine Cost vs. Value (national; varies by market). Flood-risk context: DuPage County stormwater + City of Naperville sump-pump guidance (see facts on our city guides).
So — is it worth it for you?
Usually worth it if…
- ✓You’ve lost power for a full day or more in the last few years (the 2020, 2021, and 2024 storms all did this across the western suburbs).
- ✓Your basement depends on a sump pump — DuPage/Will clay soils flood in the same storms that cut power.
- ✓Someone in the home relies on medical equipment, or you work from home.
- ✓You’re on a well (no power, no water).
- ✓You plan to stay 7+ years, so the cost spreads over many outage seasons.
- ✓Your home and its contents are high-value — more to protect, and better resale recovery.
Think twice if…
- •Your outages are rare and short (an hour or two, a couple times a year).
- •You’re likely to move within a year or two.
- •You have no basement or no sump/flood exposure.
- •Your critical loads are minimal and a portable unit or battery could cover them.
Why the math tilts positive in the western suburbs
The ROI question is really an outage-frequency question, and this market answers it. The August 2020 derecho left roughly 58,000 DuPage County homes dark for up to five days; a June 2021 EF-3 tornado and a July 2024 derecho each put tens of thousands more into multi-day outages. Add the sump-pump flood exposure that comes with the same storms, and the value a generator protects here is unusually concrete — which is exactly why so many of these homes have one. See your city’s outage history and permit rules: Naperville, Aurora, Wheaton, Downers Grove, Oak Brook.
See what it costs for your home
The worth-it math turns on your home’s size, loads, and site conditions. Tell us about your home and we’ll connect you with an established local installer for a real number — no national call center.