Pricing
Installed prices, by size. Switch, pad and permits included.
These are planning ranges for a running system in a typical home around Concord, not the price of a generator in a box. Your firm price comes in writing after a free site visit.
Price book
Spring 2026 ranges
- Smallest
- $9,800
- Most homes
- 18 to 22 kW
- Quote valid
- 60 days
- Deposit
- 10% to book
Four size bands
Not sure which band? The sizing calculator gives an estimate in a minute.
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Essentials
10 to 14 kW
Hemlock air-cooled
$9,800 to $13,500
installed, before tax
Fits: Smaller homes, or larger homes that only need heat, well, fridge, sump, lights and internet.
Switch: 100 to 200 A automatic switch, usually with one or two load management modules.
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Where most homes land
18 to 22 kW
Hemlock air-cooled
$13,500 to $18,500
installed, before tax
Fits: Typical 1,800 to 3,000 sq ft homes with gas or oil heat, a well, and one central air system.
Switch: 200 A service-rated automatic switch. Load management for the dryer or a second AC.
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Larger homes
24 to 26 kW
Hemlock air-cooled
$16,500 to $21,500
installed, before tax
Fits: Bigger homes, two AC systems, heat pumps, or an electric range you want to keep using.
Switch: 200 A service-rated switch with load management on the heaviest loads.
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Large and all-electric
30 to 48 kW
Ledgestone liquid-cooled
$27,000 to $42,000
installed, before tax
Fits: Large or all-electric homes, 400 A services, home offices and workshops that cannot pause.
Switch: One 400 A switch or two 200 A switches. Poured concrete pad.
In every range
What the price includes
- Site visit and load check at your panel
- Generator and automatic transfer switch
- Composite pad (air-cooled) or poured concrete pad (liquid-cooled)
- Gas or propane line up to 30 ft from the meter or regulator
- Electrical run up to 30 ft between the unit and the switch
- Town electrical and gas permits, filed by us
- Inspection booked and attended by us
- Startup, test under real house load, and weekly exercise set
- Walkthrough with you, and a one-page outage card for the fridge
- Your first-year maintenance visit
Example quote · fictional
22 kW on propane, a 2,400 sq ft home in Hopkinton
Well, sump, gas furnace, one 3-ton central air, electric dryer.
- Hemlock 22 kW air-cooled generator
- $7,900
- 200 A service-rated automatic transfer switch
- $1,650
- Load management module (electric dryer)
- $450
- Composite pad, placement and leveling
- $350
- Propane line, 30 ft, and second-stage regulator
- $950
- Electrical run, 30 ft, conduit and materials
- $1,100
- Install labor (one day, crew of two)
- $2,600
- Town electrical and gas permits
- $325
- Inspection, startup under load, walkthrough
- $450
- First-year maintenance visit
- included
- Total before tax
- $15,775
Inside the 18 to 22 kW range. The load module on the dryer is what let this house use a 22 kW unit instead of a 26 kW one.
What changes the price
The usual extras, priced in advance
If your house needs any of these, they are on the written quote before you sign. They never appear for the first time on the invoice.
| Extra | Range (USD) |
|---|---|
| Longer gas or electrical run Beyond the 30 ft included in every quote | $40 to $65 per extra foot |
| Load management module Lets a smaller unit run a bigger house by pausing one heavy load | $350 to $650 each |
| AC soft-start kit Cuts the starting surge of a central air system | $350 to $500 |
| Second transfer switch (400 A service) Larger homes with two 200 A panels | $2,400 to $3,800 |
| Hard access Hand-carry over a slope, or a small crane over a fence | $300 to $1,200 |
| Propane tank Set by your propane supplier. Lease or buy through them; we coordinate the spot and the line | Through your supplier |
Other prices people ask about
- Repair diagnostic visit $189
- Annual maintenance plan $289 / yr
- Inlet and interlock for a portable from $850
- Transfer switch replacement from $2,200
Spread it over 5 to 10 years
Example: a $16,000 install over 7 years works out to roughly $232 a month at an 8.99% example rate after a 10% deposit. Checking your rate does not affect your credit score.
See financingSite visits are free
Get your number in writing.
A free site visit, a written quote within two business days, and every line priced. Start the quote request or call Ruth.