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Find Generator install pros in Downingtown

Avatar for Synergy Power Systems, Inc.
Synergy Power Systems, Inc.
5.0(
10
)
Generator - Install - For Business

Serving Downingtown, PA and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"My mother used this company for her generator installation and recommended them to me because she loved them so much. I also ended up hiring them. All went well as expected, start to finish the crew as awesome. No regrets."
Reading Area
Chester County
Denver Pa
Generator Installed
Generac Generator Installed

+10

Response time1 day
Recommended by100%of homeowners
John Gambino Electric
4.8(
253
)
Portable Generator - Install

Serving Downingtown, PA and surrounding areas

Approved

In business since 1985

Free estimates

Credit card accepted

"So much YES!!! John called me back within one business day of my initial inquiry to give us a quote and explain the generator transfer switch install process. We set an appointment for which Bill showed up exactly on time. He was OUTSTANDING. He explained everything he was planning to do, answered our questions along the way, gave us status updates and even though our house wasnâ t the most cooperative, went above & beyond to put the transfer switch in a spot that was more challenging for him but more convenient for us. Top notch customer service. He walked us through how to work everything and simulated a power outage to ensure it was perfect. And it was. John Gambino Electric has new lifelong customers. Thanks John & Bill!!!"
Response time9 hrs
48 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Mister Sparky Electric
Mister Sparky Electric
4.4(
324
)
Fixed Generator - InstallPortable Generator - Install

Serving Downingtown, PA and surrounding areas

Approved

Super Service Award Winner

In business since 1959

Free estimates

Emergency services offered

"Jason installed doorbells at 2 doors. There were no functioning doorbells when I purchased this house 5 years ago. Various contractors warned me of the difficulty and expense of hardwired installations, making me put off the project. Wireless doorbells were unreliable. I was encouraged by James, who did my annual electrical maintenance, and scheduled the work for me. Jason did a fantastic job by creative thinking to avoid the difficulties I'd previously been warned about. He did the job quickly, neatly, and very successfully. I am thrilled to have working doorbells for the first time in 5 years!"
 Office
  Office
  Office
131 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for A&M Electric LLC
A&M Electric LLC
5.0(
5
)
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Repair+3 more

Serving Downingtown, PA and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

A&M Electric LLC is a veteran-owned, Christian-based electrical contractor proudly serving Lancaster County and surrounding Central Pennsylvania communities with reliable residential, commercial, agricultural, and industrial electrical services. We specialize in electrical panel upgrades, 200 amp service upgrades, EV charger installation, generator installation, electrical troubleshooting, lighting installation, rewiring, new construction wiring, remodels, emergency electrical repairs, and commercial electrical services. Our licensed electricians provide safe, code-compliant, and high-quality electrical work for homeowners, businesses, farms, warehouses, offices, retail spaces, and construction projects throughout Lancaster County and Central Pennsylvania from our base in Ephrata, PA. Also serves Reading, Lancaster, York, the greater Harrisburg and Philadelphia areas, Mohnton, Coatesville, Landale, Montgomery County, Hatfield, King of Prussia, and Bryn Mawr.

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Project Photos

+35

46 neighbors recently requested a quote
Avatar for AMF Electric, LLC
AMF Electric, LLC
5.0(
3
)
Fixed Generator - InstallPortable Generator - InstallFixed Generator - Repair+4 more

Serving Downingtown, PA and surrounding areas

Approved

In business since 2009

Free estimates

Warranties offered

AMF Electric, LLC has over fifteen years of experience in the residential, commericial and industrial electrical field services. We offer professional work with 100% satisfaction guaranteed on every job. If you're looking for high quality and personal service, you've come to the right place. At AMF Electric, LLC we'll give you the attention and personal service you'll come to expect and enjoy. \n\nOur rates are competitive, with no hidden fees. Our employees are friendly and will be there to help you every step of the way.\n\nAMF Electric, LLC has been providing electrical service in City of Philadelphia and the surrounding counties. So let us put our experience to work for you!

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+7

8 neighbors recently requested a quote
Recommended by100%of homeowners
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Generator Install questions, answered by experts

To determine the right size generator for your house, you should calculate the total wattage of the appliances and devices you want to power during an outage. List all essential items, note their start-up wattages, and add them together.

Here are some typical wattage requirements for common appliances:

  • Refrigerator: 600 watts

  • Large dehumidifier: 700 watts

  • Large window air conditioner: 1,400 watts

  • Water heater: 3,000 to 4,500 watts

  • Electric furnace: 5,000 to 25,000 watts

A 7,500-watt generator might be sufficient for essentials like a refrigerator, freezer, well pump, and lighting circuits. However, for high-demand items like a water heater or furnace, a whole-home generator is a better choice. A portable generator may be enough if you only need to power a few critical items.

While home square footage can offer a rough estimate, it is not always a reliable indicator. For reference, here are some typical generator sizes based on square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14 kW

  • 2,500 sq ft: 12–16 kW

  • 3,000 sq ft: 16–20 kW+

For the most accurate sizing, consult a professional who can calculate your home's peak and average power consumption and recommend the optimal generator.

Yes, in some locations, it is required by the National Electric Code (NEC) to have a transfer switch installed for electrical emergencies. In addition to following electrical code, generator transfer switches ensure your home is fully protected during a power outage. By switching the power from the main breaker to the generator breaker, you can seamlessly operate your HVAC, lights, appliances, devices, and more during an emergency. 

To power a central air system during a power outage, the whole-house generator will need to be at least 5,000 watts, and this number will significantly increase for larger units. Check the specific wattage requirements of your AC unit to choose the right generator size. Consider consulting a generator installer to ensure your whole-house generator meets your electrical load needs.

Generally, you’ll want to keep between 60 and 70 feet between the generator and the transfer switch. There are a few reasons for this, including:

  • The distance reduces the noise coming from the generator into your home.

  • It increases efficiency because you won’t have a voltage drop from this short of a distance.

  • Prevents carbon monoxide poisoning: keep at least 15 feet between your generator and an open window. 

Sizing a generator is a careful process that requires calculating the electrical load of your entire house. You have to take into account every device you want to use and their wattage requirements, plus the wattage needed to start them, and look for a generator that can safely run all that at around 80% capacity.

In more practical terms, a small home can run on a 10,000-watt generator (and if you only want to power a few key appliances, much less than that). A mid-sized home may need something between 15,000 and 22,000 watts. Larger homes require 25,000 watts or more. 

The Downingtown, PA homeowners’ guide to generator installs

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