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Avatar for GAC Services

GAC Services

4.86(
269
)
Approved Pro

GAC Services

4.86(
269
)
Approved Pro
Customers say: Quick response
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
56 years of experience

GAC Services is a residential cooling, heating, and electrical contractor setting new standards in the Maryland HVAC and electric market. Since 1970, we’ve developed a strong reputation for providing the Montgomery County and Frederick County areas with reliable cooling and heating services. In 2014, we expanded our service offerings to include electrical services—allowing us to offer our customers the same great service in a new area of business. Additional DBA: Gaithersburg Heating & Cooling

"The technician that was tasked with the job was very knowledgeable and professional."

Kenneth B on January 2026

GAC Services is a residential cooling, heating, and electrical contractor setting new standards in the Maryland HVAC and electric market. Since 1970, we’ve developed a strong reputation for providing the Montgomery County and Frederick County areas with reliable cooling and heating services. In 2014, we expanded our service offerings to include electrical services—allowing us to offer our customers the same great service in a new area of business. Additional DBA: Gaithersburg Heating & Cooling

"The technician that was tasked with the job was very knowledgeable and professional."

Kenneth B on January 2026


Avatar for W B Lightning Rods

W B Lightning Rods

4.93(
297
)
Approved Pro

W B Lightning Rods

4.93(
297
)
Approved Pro
Customers say: Quick response
Recommended by 98% of Angi customers
Recommended by 98% of HomeAdvisor customers
25 years of experience

WB Lightning Rods is a third-generation lightning protection contractor. Family Owned and operated for over 60 years. installing U.L. Listed Lightning protection systems, All Over the East coast, Midwest south east and south west regions of the U.S. Installations on Residential Homes, Estate Properties, Agricultural and Equestrian Properties. Lightning Protection for trees is also available. No job to big or small References upon Request. Contact us today for a no cost or obligation estimate. We look forward to working with you on your Lightning Protection Project. Thank you. **WE ARE NOT ELECTRICIANS** **WE ONLY INSTALL LIGHTNING PROTECTION SYSTEMS **

"Great company, they were fast, friendly, & accommodating. I would definitely use them again."

Jennifer B on October 2024

WB Lightning Rods is a third-generation lightning protection contractor. Family Owned and operated for over 60 years. installing U.L. Listed Lightning protection systems, All Over the East coast, Midwest south east and south west regions of the U.S. Installations on Residential Homes, Estate Properties, Agricultural and Equestrian Properties. Lightning Protection for trees is also available. No job to big or small References upon Request. Contact us today for a no cost or obligation estimate. We look forward to working with you on your Lightning Protection Project. Thank you. **WE ARE NOT ELECTRICIANS** **WE ONLY INSTALL LIGHTNING PROTECTION SYSTEMS **

"Great company, they were fast, friendly, & accommodating. I would definitely use them again."

Jennifer B on October 2024


Avatar for TriState Home Services

TriState Home Services

4.73(
181
)
Approved Pro

TriState Home Services

4.73(
181
)
Approved Pro
Customers say: Super punctual
Recommended by 91% of Angi customers
Recommended by 91% of HomeAdvisor customers
77 years of experience

If you are looking for a HVAC Contractor, a Plumbing Contractor, or an Electrical Contractor to provide you with great service, you've come to the right place. We provide heating services, air conditioning services, plumbing services, and electrical services to our customers in Frederick and the surrounding Counties, the Pan Handle of West Virginia, and Northern Virginia, from our offices located in Frederick MD. With 3 generations of experience in providing heating, air conditioning, plumbing, and electrical services, we are dedicated to providing the best possible products and services for you, and your family.

"Great service very prompt and easy to work with."

Randy W on May 2025

If you are looking for a HVAC Contractor, a Plumbing Contractor, or an Electrical Contractor to provide you with great service, you've come to the right place. We provide heating services, air conditioning services, plumbing services, and electrical services to our customers in Frederick and the surrounding Counties, the Pan Handle of West Virginia, and Northern Virginia, from our offices located in Frederick MD. With 3 generations of experience in providing heating, air conditioning, plumbing, and electrical services, we are dedicated to providing the best possible products and services for you, and your family.

"Great service very prompt and easy to work with."

Randy W on May 2025


"We were hoping to get everything operating on one remote, but we donâ t live in a perfect world. The technician was able to show us new and wonderful things with our system though, and he was able to navigate the hideous tangle of wires pretty successfully through the whole process."

Charles G on August 2023

We offer solid experience in commercial and residential audio/video distribution. This includes dedicated theatre and/or media rooms; security cameras and lighting control. We've established a top-notch reputation in the greater Washington, D.C. area.

"We were hoping to get everything operating on one remote, but we donâ t live in a perfect world. The technician was able to show us new and wonderful things with our system though, and he was able to navigate the hideous tangle of wires pretty successfully through the whole process."

Charles G on August 2023


Avatar for Ash Electric LLC

Ash Electric LLC

4.97(
19
)
Approved Pro

Ash Electric LLC

4.97(
19
)
Approved Pro
Customers say: Quick response
25 years of experience
Free onsite estimate

We are licensed, bonded and insured Master Electricians in Maryland, the District of Columbia and Virginia. At Ash Electric LLC our company is based on the belief that our customers' needs are of the utmost importance. Our team is committed to meeting those needs. We welcome the opportunity to earn your trust and deliver you the best service. No job is too big or too small for our experienced team. Call today for a quote!

"Noah arrived on time, got the job done. Answered questions as he was working. I’d recommend these guys. "

Chip R on June 2025

We are licensed, bonded and insured Master Electricians in Maryland, the District of Columbia and Virginia. At Ash Electric LLC our company is based on the belief that our customers' needs are of the utmost importance. Our team is committed to meeting those needs. We welcome the opportunity to earn your trust and deliver you the best service. No job is too big or too small for our experienced team. Call today for a quote!

"Noah arrived on time, got the job done. Answered questions as he was working. I’d recommend these guys. "

Chip R on June 2025


"Our existing generator died. James diagnosed the problem and gave us a few options to repair or replace it. We chose to replace it. James handled everything, from getting and installing the new generator to electrical and fuel (propane) connections. We have asked him to schedule us for the annual maintenance on the machine. We are pleased, though we haven't lost power since it was installed, LOL. "

Gail D on January 2025

Welcome to Rollins Repair! We specialize in residential generator installations, repairs and service work. We are an authorized Guardian Generator Dealer and Installer. Give us a call today.

"Our existing generator died. James diagnosed the problem and gave us a few options to repair or replace it. We chose to replace it. James handled everything, from getting and installing the new generator to electrical and fuel (propane) connections. We have asked him to schedule us for the annual maintenance on the machine. We are pleased, though we haven't lost power since it was installed, LOL. "

Gail D on January 2025


Avatar for Dead Rock Contractor Services, LLC

Dead Rock Contractor Services, LLC

5.00(
17
)
Approved Pro

Dead Rock Contractor Services, LLC

5.00(
17
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
21 years of experience

With over 30 years of experience, Dead Rock Services provides trusted residential and commercial Electrical, HVAC and Plumbing services across Jefferson County and the Tri-State area. Our licensed and insured team delivers expert workmanship, honest pricing, and exceptional customer care on every job. Whether you need an electrical panel upgrade, generator installation, EV charger, HVAC or plumbing repair, we’re your local one-call solution. 🏆 A Solid Reputation Built on Solid Relationships.

"Great Company"

Derek G on May 2022

With over 30 years of experience, Dead Rock Services provides trusted residential and commercial Electrical, HVAC and Plumbing services across Jefferson County and the Tri-State area. Our licensed and insured team delivers expert workmanship, honest pricing, and exceptional customer care on every job. Whether you need an electrical panel upgrade, generator installation, EV charger, HVAC or plumbing repair, we’re your local one-call solution. 🏆 A Solid Reputation Built on Solid Relationships.

"Great Company"

Derek G on May 2022


Avatar for Mario Falconio Electric, LLC

Mario Falconio Electric, LLC

5.00(
13
)
Approved Pro

Mario Falconio Electric, LLC

5.00(
13
)
Approved Pro
Super Service Award
6 years of experience
Free onsite estimate

Mario Falconio Electric, LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. We have accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"Mario installed a 240v outlet in my garage. This required a new breaker and about 100 feet of wire. Mario laid out a good plan in running the wire from the box in my basement, through the attic, on out to the garage. He is very efficient and safe with his work. Excellent price!"

William H on October 2025

Mario Falconio Electric, LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. We have accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"Mario installed a 240v outlet in my garage. This required a new breaker and about 100 feet of wire. Mario laid out a good plan in running the wire from the box in my basement, through the attic, on out to the garage. He is very efficient and safe with his work. Excellent price!"

William H on October 2025


Avatar for Kolb Electric Inc

Kolb Electric Inc

4.22(
216
)
Approved Pro

Kolb Electric Inc

4.22(
216
)
Approved Pro
Customers say: Super punctual
101 years of experience
Free onsite estimate

We are a family owned and operated business that has been serving the Baltimore, Washington Metropolitan area since 1925. We are committed to providing superior electrical services. The valuable advantages we can offer you are great service, high quality and experienced workers at a competitive price.

"Do not use this company. They will rip you off. The contract was for eight 300W LED 40 ft pole lights, but I caught them redhanded installing 240W. Who does that? Then, they broke my lock and broke into my sprinkler room which I saw on my video which they admitted. Then, Kolb sued me for not paying the bill which I disputed due to lost tools as result of the break-in. Who does that breaking into a customer's sprinkler room and not informing that they did. I had to catch them on my video. Not only that it took over one year to the work proposed work. TOTAL FRAUD. I will be going to court...."

John A on November 2023

We are a family owned and operated business that has been serving the Baltimore, Washington Metropolitan area since 1925. We are committed to providing superior electrical services. The valuable advantages we can offer you are great service, high quality and experienced workers at a competitive price.

"Do not use this company. They will rip you off. The contract was for eight 300W LED 40 ft pole lights, but I caught them redhanded installing 240W. Who does that? Then, they broke my lock and broke into my sprinkler room which I saw on my video which they admitted. Then, Kolb sued me for not paying the bill which I disputed due to lost tools as result of the break-in. Who does that breaking into a customer's sprinkler room and not informing that they did. I had to catch them on my video. Not only that it took over one year to the work proposed work. TOTAL FRAUD. I will be going to court...."

John A on November 2023


Avatar for Ewell Home Improvements LLC

Ewell Home Improvements LLC

4.75(
53
)
Approved Pro

Ewell Home Improvements LLC

4.75(
53
)
Approved Pro
Customers say: Quality work
21 years of experience
Emergency services offered

Ewell Builders and Power company: the reliable contractor Serving the greater DMV area, we provide professional construction and electrical services for both residential and commercial clients. Our commitment to transparency ensures that you have all the information you need, leaving no questions unanswered. With years of experience, we've refined our approach to become one of the region's premier service providers. We leverage the latest technology to stay ahead of the competition and deliver top-notch results. Choose Ewell Builders and power company for reliable energy solutions you can count on.

"People are very nice and honest.. Did the work on time and did a good job. I did not like the thermostat that was installed. We are older and could not read the actual temp because it was such small print. It was also very hard to program. They installed the new one and took the time to show me how to use it, at no extra cost. Very happy with their work."

Marvin F on December 2020

Ewell Builders and Power company: the reliable contractor Serving the greater DMV area, we provide professional construction and electrical services for both residential and commercial clients. Our commitment to transparency ensures that you have all the information you need, leaving no questions unanswered. With years of experience, we've refined our approach to become one of the region's premier service providers. We leverage the latest technology to stay ahead of the competition and deliver top-notch results. Choose Ewell Builders and power company for reliable energy solutions you can count on.

"People are very nice and honest.. Did the work on time and did a good job. I did not like the thermostat that was installed. We are older and could not read the actual temp because it was such small print. It was also very hard to program. They installed the new one and took the time to show me how to use it, at no extra cost. Very happy with their work."

Marvin F on December 2020

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Generator Install questions, answered by experts

Here’s what you can run with different wattages and types of generators:

Portable generator:

  • 2,000 watts can handle a large appliance like a freezer or refrigerator, plus a few smaller items like phones or computer chargers. 

  • 4,000 watts will keep two large appliances operating and a few smaller devices.

  • 8,000 watts should power most essential appliances and other devices, including a sump pump, well pump, or your dishwasher.

Partial to whole-house generator:

  • 20,000 watts and above will make it seem like your home’s power is still on.

The cost to install a whole-house generator averages at $5,200, but costs can range from $1,500 to $8,900, depending on the type and size of the generator, and the labor required to install it. To find the best deal while still ensuring the unit meets all the needs of your household, hire an electrician to calculate the electrical load of your must-have appliances and electronics beforehand so you don’t pay for more power than you need. As always, be sure to get at least three quotes to find the ideal fit for your needs and budget.

While standby generators provide essential backup power, they can fail when you need them most due to lack of maintenance, fuel supply issues, dead batteries, electrical problems, or improper installation. To avoid costly failures, professional installation and regular maintenance are crucial. Licensed technicians ensure safety, uphold warranty requirements, comply with regulations, and provide expert servicing.

Generators are usually sized by running watts and starting watts. Ideally, you’ll want a generator that can offer both the necessary running watts and starting watts for everything you need to power without going beyond 90% of its capacity. Calculate your home’s electrical load based on the breakers in your home or adding up the appliance and lighting needs of connected rooms.

It might seem counterintuitive, but installing a generator transfer switch will save you money in the long run. While you’ll have to pay between $400 and $2,500 to have the transfer switch installed, you’ll recoup that amount later on when you don’t have to pay for expensive repairs to your appliances, devices, and electrical system that may have burned out, overloaded, or stopped working due to a sudden loss of power or an incorrect hook up of a generator to your home

The Boonsboro, MD homeowners’ guide to generator installs

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

What do you need done? We’ll find top pros.
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