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TRUSTED BY ADELPHI, MD HOMEOWNERS

  • Average homeowner rating star icon4.8
    Average homeowner rating
  • Verified reviews icon11
    Verified generator installs reviews

Find Generator install pros in Adelphi

Avatar for GAC Services
GAC Services
4.8(
291
)

Serving Adelphi, MD and surrounding areas

Approved (Corporate)

In business since 1970

Free estimates

Warranties offered

"I’m back again to write another stellar review for GAC. Last year they replaced our HVAC system; this year we circled back and had them install a home generator. This was a long and drawn out process due to the various approvals needed from Montgomery County as well as coordination with Washington Gas (which ended up not just being a simple sign off but necessitating an additional, expensive upgrade to the gas line from the street to our home). Nevertheless, GAC did a fantastic job shepherding this process over the 6+ months of waiting on stakeholders, and they were also maximally accommodating to our family’s significant constraints on time and availability (due to health concerns related to a medically fragile family member). A special kudos to Sandy M, GAC’s master electrician, who took it on personally to ensure we were taken care of all throughout this process, going above and beyond with phone calls, text messages, personal visits, etc. on behalf of my family, I want to thank GAC and am giving top marks across the board for this effort which was complex , lengthy, and ultimately successful."
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66 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for RaLo Enterprise LLC
RaLo Enterprise LLC
4.7(
209
)

Serving Adelphi, MD and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"I am very pleased with the work done! I saved $$ by not having to buy another light fixture! The electrician's expertise, efficiency and advice is greatly appreciated! I will definitely reach out again for my next electrical project!"
Response time3 days
2 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Chesapeake Electric
Chesapeake Electric
4.7(
75
)

Serving Adelphi, MD and surrounding areas

Approved

In business since 2014

Emergency services offered

Warranties offered

"The electrician did a quality job by relocating the light fixture; however, the actual charge was $195 or 65% more than the estimated price of $300. Owner refused to pay the extra $195 and the realtor had to pay it. Electrician also didn't replace two regular recessed light bulbs and the realtor would have to buy the light bulbs from Home Depot and installed himself."
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+5

11 neighbors recently requested a quote
Recommended by74%of homeowners
Avatar for S & S Electric LLC
S & S Electric LLC
4.8(
125
)

Serving Adelphi, MD and surrounding areas

Approved

In business since 2000

Emergency services offered

Warranties offered

"A+ Top notch service. Installing 1 attic fan, realized needed another one replaced. They went out, got a 2nd one and installed them both, plus gave advice on our under cabinet lights that always blink. Followed up the next day with a $15 solution to try before we do a repair. Good communication - they answer the phone when you call. Showed up on time and done in under 2 hours which included the time to get the 2nd fan."
One of our service vans ready to take care of all your electrical needs.
We can even take care of your projects no matter how high.
Replacing a light on a pole at a medical office building.
This generator was installed on the side of a house.  The window had to be replaced to allow for the generator to be placed in this location.  The window was made to not open per code.
We installed this 14kW generator to power the whole house.  We used load shed modules to be able to save the customer money by using a smaller generator than would have been needed if we didn't use the load shed modules.

+10

Response time1 day
1 neighbors recently requested a quote
Recommended by99%of homeowners
Green's Electric
5.0(
16
)

Serving Adelphi, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2007

Free estimates

Emergency services offered

"It went great! Professional, quick to call and discuss the request. What I like the most was their genuine interest in helping me fast. They gave me an estimate the same day and the job was performed in less than 48 hours. I would definitely hire Green Electric for my future requirements. Thanks Mr. Darnell!"
Response time1 day
25 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for NEC Electric
NEC Electric
4.9(
13
)

Serving Adelphi, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2008

Free estimates

Emergency services offered

"It was very easy to work with Joe to finalize a quote and get the job scheduled. Once onsite, Carlos and his colleague knew exactly what to do and how to run the new electric circuit across the house from the electrical panel to the garage. The installed the EV charger we had purchased separately exactly how we wanted it. Everything worked perfectly. They even went the extra mile to come back and patch the garage drywall where they had made a few holes to run the cable even though it was not included in the job initially. Overall very happy with both the price we paid and the quality of the work. Will hire again for any electrical work we'll need."
Electrical Project
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+9

Response time2 days
Response rate93%
25 neighbors recently requested a quote
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Generator Install questions, answered by experts

Homeowners can often access federal tax credits, such as the Investment Tax Credit (ITC), which covers a percentage of installation costs. Many states and utilities offer additional rebates, grants, or performance-based incentives. These programs can significantly lower your upfront investment. Check the Database of State Incentives for Renewables and Efficiency (DSIRE) or contact your local energy office for current offers.

Generators are safe to use as long as they are installed and operated correctly according to the manufacturer's recommendations. The most critical safety tips are to never use a portable or fuel-powered generator inside an enclosed space due to the risk of lethal carbon monoxide poisoning; always operate it outdoors where fumes can dissipate away from your home. Additionally, never attempt to connect a generator to your home’s electrical panel yourself—hire a professional to ensure the setup meets safety standards. Finally, avoid overloading the generator by not connecting more appliances than it is rated for, as this can damage your equipment or cause a fire.

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. 

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.

With proper maintenance, a whole-house generator can last between 20 and 40 years. The specific lifespan depends on how often and for how long the generator is used, and some models may have their life expectancy rated in hours of operation. To maximize its lifespan, expect to spend around $150 to $300 per year for annual maintenance checks from a qualified technician. During these checks, a technician will inspect the engine filter, starting mechanism, fuel, lubrication, and coolant levels. Consulting your installer and choosing a low-impact fuel like natural gas or diesel can also help ensure your generator lasts as long as possible.

The Adelphi, MD homeowners’ guide to generator installs

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