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TRUSTED BY GREENVILLE, NH HOMEOWNERS

  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon242
    Verified electrical services reviews

Top-Rated Electricians in Greenville - Updated Nov 2026

Avatar for Wilson Brothers Heating & Air Conditioning Inc
Wilson Brothers Heating & Air Conditioning Inc
4.5(
160
)
Fixed Generator - InstallElectrical Switches, Outlets & Fixtures - Install or RepairFixed Generator - Repair+19 more

Serving Greenville, NH and surrounding areas

Approved

In business since 1987

Free estimates

Emergency services offered

"We've used Wilson Bros. for nearly 18 years for our major systems work. They've installed a 2-zoned HE gas furnace and 2 water heaters and done routine maintenance. Have also responded immediately in one or two emergencies. This is a family run organization. EVERYONE from accounting to technicians to estimators to the owner of the company are professional, personable and know what they're doing. And they get things done. They are not the cheapest in town, but their pricing makes sense and i'm willing to pay for the continuity. For less important things i'll use journeyman plumbers. But for the important stuff Wilson Bros. are my go-to folks. I can't say enough good things about them, if you couldn't already tell."
Three of the five heads are marked by the numbers in the blue circle. On the inside of the house is where you will find the mounted units. The slim ducts run alongside the white arrows and will eventually be covered to match the exterior of the house.
The slim ducts in the basement ceiling that connect from the branch box all the way to the 5 different heating and cooling units. These will be covered by the ceiling tiles once the job is finished.
5 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for The Speedy Sparky LLC
The Speedy Sparky LLC
5.0(
8
)
Electrical Switches, Outlets & Fixtures - Install or RepairElectrical Wiring or Panel UpgradeElectrical for Home Addition or Remodel - Install+1 more

Serving Greenville, NH and surrounding areas

Approved

In business since 2023

Free estimates

Warranties offered

"Aubrey is great. We set an appointment which he was prompt for. He estimated the time which he was also right on the money, and the work was done neat, clean, and everything tested perfectly. This is the second time I have had him do some work for me and will call him for anything else electrical that I have."
Camper outlet & breakers
Camper outlet & breakers
Response time11 hrs
Response rate90%
MJS Electrical Services, LLC
3.6(
38
)
Fixed Generator - InstallElectric Vehicle Charging Station Installation - Materials Not ProvidedElectric Vehicle Charging Station Installation - For Business - Materials Not Provided+3 more

Serving Greenville, NH and surrounding areas

Approved

In business since 2007

Free estimates

Credit card accepted

"what they quoted was the final bill.....they cleaned up every area as they installed. They double checked as they were leaving to make sure everything was 100%. I wish they did more than electrical!!!"
7 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for W B Lightning Rods
W B Lightning Rods
4.6(
372
)
Lightning Protection - Install or Repair

Serving Greenville, NH and surrounding areas

Approved

In business since 2001

Free estimates

Warranties offered

"William and staff responded promptly to my request for service with reasonable pricing. They arrived at the house at the agreed upon time, were respectful of my property, explained the process and completed the work within the specified time frame. They were pleasant, easy to work with and installed a quality lightning rods system. I highly recommend them."
lightning protection
 Residential LPS
lightning protection
 Residential LPS
lightning protection

+79

Response time1 day
145 neighbors recently requested a quote
Recommended by96%of homeowners
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Electrical FAQs, answered by experts

In the United States, home outlets support a standard 15 amps, but you can upgrade per outlet if necessary. Most single-family residential homes have a maximum overall amp rating, usually 100 to 200 amps. Very old houses may have less than 100 amps, but that’s rare. Large homes often come with amp services above 200 amps to support modern lifestyles.

Technically, an outdoor outlet can be on the same circuit as an indoor outlet, but it's generally not recommended. Outdoor outlets should ideally be on a dedicated circuit that doesn't share power with other indoor or outdoor outlets. This helps ensure that the outdoor outlets are able to handle the additional electrical load without overloading the circuit. Additionally, outdoor outlets are often exposed to the elements, which can increase the risk of electrical shock and other hazards. If you must have an outdoor outlet on the same circuit as an indoor outlet, be sure that the circuit has the capacity to handle the additional load.

It’s possible to distinguish a positive black wire from a negative black wire if you know what type of circuit the wires are in. If it’s an alternating current (AC), then black wires are positive. If it’s a direct current (DC), then black wires are negative. 

Sometimes, a circuit has two black wires. In that case, the positive black wire will be solid black while the negative black wire will have a white stripe on it. If you’re still unsure, you can use a multimeter to check.

Yes, wires are still hot, even if the light switch is off. The only way to ensure the wire is no longer live and that you can work with it safely is to open your circuit breaker, locate the breaker for the outlet you’re working with, and turn off the breaker for that outlet.

If your thermostat does not have a C-wire, you can hire a professional to check for an abandoned C-wire hidden in the wall, install a new C-wire, repurpose an existing G-wire to function as a C-wire, or purchase a C-wire adapter kit. 

There are some smart thermostat models that do not require a C-wire, but this will limit the functionality of the smart technology.

The Greenville, NH homeowners’ guide to electrical services

From average costs to expert advice, get all the answers you need to get your job done.