Whole-House Generator Cost in Connecticut (2026)
A whole-house standby generator installed in Connecticut runs $8,000–$18,000 for a typical air-cooled Generac or Kohler system. An essential-circuits setup costs less; a full whole-home system with central AC on backup costs more. Every number below includes the transfer switch, gas line, electrical tie-in, permit, and inspection. Here’s the honest breakdown, written by Tyler Faye, a CT-licensed master electrician who installs standby generators across storm-prone Eastern Connecticut.
Generator Cost at a Glance
Essential circuits (10–14 kW)
$6,000 – $10,000Air-cooled unit on a managed or essential-circuits transfer switch — covers heat, well pump, fridge, and key outlets. Best value if you do not need central AC on backup.
Whole-home (18–22 kW)
$9,000 – $14,000Runs most of the house including one AC system, on a whole-home automatic transfer switch. The most common Generac/Kohler choice for CT homes.
Full whole-home (24–26 kW)
$12,000 – $18,000Larger homes, multiple AC zones, electric appliances — whole-home ATS, heavier gas and electrical work.
Large / liquid-cooled (32 kW+)
$18,000 – $30,000+Estate-scale or all-electric homes needing a liquid-cooled unit and heavier service.
Installed prices in Connecticut, including the automatic transfer switch, gas connection, electrical tie-in, pad, permit, and inspection. Propane (vs. natural gas) may add $1,500–$3,000 for a tank.
Generator Cost by Size (kW)
The number that moves price most is generator size. Here’s the all-in installed cost in Connecticut for the common air-cooled sizes — each figure includes the automatic transfer switch, gas connection, electrical tie-in, pad, permit, and inspection.
Essential circuits — heat, well pump, fridge, outlets (no central AC). Managed or essential-circuits transfer switch.
Most of a small-to-mid home including one AC system, on a whole-home automatic transfer switch.
The most popular Generac/Kohler size for CT homes — whole house plus central AC on a whole-home ATS.
Larger homes or two AC zones — whole-home ATS, heavier gas and electrical work.
Big or all-electric homes, multiple AC zones — the top of the air-cooled range before liquid-cooled.
Sizes are matched to your home with a real load calculation, not a guess — covering central AC roughly doubles the kW you need versus an essentials-only setup. Tyler confirms the right size on a free site visit.
Generator Cost by Size in Tolland County
Here’s what the three sizes Tolland County homeowners ask for most actually cost installed. These are the figures TJF Electric quotes locally — a typical installed range, quoted up front, with the unit, automatic transfer switch, gas connection, electrical tie-in, pad, permit, and inspection all included. No surprise add-ons after the quote.
Heat, well pump, fridge, and key outlets on a managed/essential-circuits transfer switch — not central AC. The value pick for Tolland County homes on well-and-septic that just need water and heat through an outage.
The whole house including central AC on a whole-home automatic transfer switch. Our most-requested size across Willington, Tolland, Vernon, Coventry, and Stafford.
Larger or all-electric Eastern CT homes with two AC zones — same installed range as a 22 kW for most properties, on a whole-home ATS.
For most Tolland County homes a 22 kW and a 24 kW land in the same $11,500–$16,500 installed range — the difference is the load calculation, not a fixed price jump. Tyler sizes it on a free site visit and gives you the full installed number before any work starts. We serve all of Tolland County plus the Eastern CT towns nearby.
What Drives the Price
- Generator size (kW): Bigger units cost more and need a larger transfer switch and gas supply. Sizing comes from a load calculation — covering central AC roughly doubles the kW vs. essentials-only.
- Fuel type: Natural gas is simplest and has unlimited runtime. Propane adds a tank ($1,500–$3,000) and fuel monitoring during long outages.
- Gas line run & pressure: A long run from the meter, or a meter/line that needs upsizing to feed the generator, adds plumbing labor.
- Transfer switch type: A whole-home automatic transfer switch costs more than a managed or essential-circuits switch — but backs up the whole house.
- Distance & pad: Distance from the panel and gas source, plus the concrete or composite pad and any grading, affect labor.
Where the Money Actually Goes
Generator unit
$4,000 – $9,000The air-cooled Generac or Kohler unit itself, sized to your load.
Transfer switch
$500 – $2,000Managed/essential-circuits switch up to a whole-home automatic transfer switch.
Gas line & plumbing
$500 – $2,500Running and connecting the gas line; more for long runs or meter upsizing.
Electrical, pad & permit
$2,000 – $4,500Panel tie-in, pad, labor, permit, and inspection.
CT-Specific Considerations
Why CT homes buy standby power
Eastern Connecticut ice storms and nor’easters drop trees on overhead lines every season, and homes on well-and-septic lose water, not just lights, during an outage. That is why standby generators are one of our most-requested installs in wooded towns like Willington, Coventry, and Stafford.
Permits, gas & Eversource
A standby install needs an electrical permit (usually a gas permit too), inspection, and a transfer-switch tie-in coordinated with Eversource. We handle the gas line, the electrical, the permits, and the commissioning as part of our whole-house generator and generator installation service. Brand pages: Generac · Kohler.
Generator Cost FAQ
How much is a Generac whole-house generator installed in CT?+
A Generac air-cooled standby installed in Connecticut runs $8,000–$18,000 depending on size and transfer switch, including gas, electrical, pad, permit, and inspection. See our Generac installation page.
How much does a 14 kW generator cost installed in CT?+
About $8,000–$11,000 installed on a managed or essential-circuits transfer switch — covers heat, well pump, fridge, and key outlets (not central AC). Includes unit, transfer switch, gas, electrical, pad, permit, and inspection.
How much does a 22 kW generator cost installed in CT?+
About $11,000–$15,000 installed — the most popular size for CT homes, running the whole house including central AC on a whole-home automatic transfer switch. All-in price including gas, electrical, pad, permit, and inspection.
How much does a 24 kW or 26 kW generator cost installed in CT?+
A 24 kW runs about $12,000–$16,000 and a 26 kW about $13,000–$18,000 installed — whole-home automatic transfer switch, sized for larger or all-electric homes with multiple AC zones. The top of the air-cooled range before liquid-cooled.
How much does a 22kW Generac cost installed in Tolland County?+
In Tolland County, a 22 kW Generac or Kohler whole-home standby typically runs about $11,500–$16,500 installed — the same range as a 24 kW for most homes here — running the whole house including central AC on a whole-home automatic transfer switch. We quote the full installed price up front: unit, transfer switch, gas, electrical, pad, permit, and inspection, with no surprise add-ons. It is our most-requested size in towns like Willington, Tolland, Vernon, Coventry, and Stafford.
14kW vs 22kW vs 24kW — which size do I need?+
For Tolland County and Eastern CT homes: a 14 kW (typical installed range ~$8,000–$11,000, quoted up front) runs essential circuits — heat, well pump, fridge, key outlets — but not central AC. A 22 kW (~$11,500–$16,500 installed) is the popular whole-home pick that also runs central AC. A 24 kW (~$11,500–$16,500 installed, top of that range) suits larger or all-electric homes with two AC zones. The right size comes from a real load calculation, not a guess — Tyler confirms it on a free site visit.
What size generator do I need?+
Most CT homes are covered by an 18–26 kW air-cooled unit. A 22–24 kW with a whole-home transfer switch runs the whole house including AC; a 10–14 kW on an essential-circuits switch covers heat, well pump, and fridge for less. We size it from a load calculation.
Natural gas or propane?+
Natural gas is simplest and cheapest if you have it — no tank, unlimited runtime. Propane adds a tank ($1,500–$3,000) and fuel monitoring during long outages. We confirm gas pressure and line size on the site visit.
Do I need a permit for a standby generator?+
Yes — electrical and usually gas permits plus inspection, with the transfer-switch tie-in coordinated with Eversource. We handle all of it end-to-end.
How long does installation take?+
One to two days on site: set the pad and unit, run the gas line, wire the transfer switch and tie into the panel, commission and test. Permit/inspection scheduling adds a few days to a couple of weeks.
Get a Generator Quote From TJF Electric
Tyler sizes the generator from an actual load calculation and quotes the all-in number — unit, gas, transfer switch, pad, and permit. Free same-day estimates across Willington, Vernon, Ellington, Manchester, Coventry, Storrs, and all Eastern CT. Want a ballpark first? Try the free generator cost calculator.
Related: Whole-House Generators · Generac · Kohler · Generator Service