Whole house generators · Generac Certified
Whole House Generator Installation in Southern NH and the Merrimack Valley
A permanently installed standby generator, sized to your home, that takes over within seconds of an outage.
What you get
The whole house stays on, not just a few circuits
Whole house generator installation is putting in a permanent standby generator that senses a power outage, starts by itself, and carries your entire home until utility power returns. As a Generac Certified Installer, we size the unit to your real electrical load, set it on a proper pad, install the automatic transfer switch, and pull the permit and handle the inspection, so the house keeps running through a New England storm whether you are home or not.
A whole house generator is sized for everything: the heat or heat pump, the well pump, central air, the kitchen, and the everyday circuits you would otherwise lose. That takes a real load calculation, not a guess, because the unit has to cover the surge a motor pulls when it starts as well as the steady load. We walk the house with you, do the math, and recommend the smallest unit that genuinely covers the home, then set it the right distance from windows and doors and wire it through a service-rated automatic transfer switch.
Load calculation and honest estimate
We walk the house, list what runs on it, calculate the running and startup load, and give you a clear written number for a unit sized to the whole home.
Pad, wiring, and transfer switch
We prepare the pad as the job requires, run the wiring, install the automatic transfer switch, and pull the permit. Your gas or propane supplier, or a licensed gas fitter, makes the fuel hookup, and we coordinate the timing.
Commission and walk-through
We run a real transfer, confirm the unit starts and carries the house, pass the inspection, and show you the controls and the weekly self-test.
More generators
Other generators we install
One call covers it. Here is the rest of what we do in this area.
Straight answers
Whole House Generator Installation: common questions
Straight answers from a licensed master electrician. Flip any breaker to read it.
Get a Free EstimateWhat size generator runs a whole house?
It depends on the house. A typical Southern NH home with a well pump, oil or gas heat, and central air often needs a larger air-cooled unit, while an all-electric home with a heat pump and electric range needs more. The honest answer comes from a load calculation of your actual equipment, which is exactly what we do before we quote.
Whole house generator or an essentials-only system?
A whole house unit covers everything with no thinking during an outage. An essentials system uses a smaller generator and a managed transfer switch to keep the heat, well pump, refrigerator, and a few key circuits running. We price both when it makes sense so you can choose with real numbers.
How long does a whole house generator installation take?
The on-site install usually takes a day or two once the unit and permit are in hand. The bigger variables are equipment availability, the permit and inspection schedule in your town, and your fuel provider's hookup date, which we coordinate so the project comes together without a long gap.
Where can the generator go on my property?
It has to sit a safe distance from windows, doors, and vents and meet the manufacturer's clearance rules, and it should be as close to the gas meter or propane tank and the electrical service as the rules allow, which keeps the install cleaner and less expensive. We pick the spot with you on the walk-through.
Get an honest quote for Whole House Generator Installation
Tell us what is going on and we will lay out clear, honest options and what they cost.
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- States licensed, New Hampshire and Massachusetts