Get matched with top generator installers in Merrimac, MA
There are 12 highly-rated local generator installers.
Verified Reviews for Generator Installation pros in Merrimac, MA
*The Angi rating for Generator Installation companies in Merrimac, MA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Installation needs.
*The HomeAdvisor rating for Generator Installation companies in Merrimac, MA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Installation needs.
Last update on May 22, 2025
Generator installers in Merrimac
Heritage Home Service is proud to serve residents from Northeast Massachusetts. We are the area’s premier home services provider and for 35+ years, we’ve brought the Heritage touch to homes throughout the state.
"My initial experience was good when I had Ryan come and rebuild the interior of the boiler and the associated electronics for a total of around $1500 including parts and lots of labor. Then when I called today to have a simple relay replaced, Richard arrived and these people at Heritage proved that they are hucksters of the first order. Stay away from them at all costs!! They tried to sell me a $80 off-the-shelf switching relay for $500!!! Then when I told Richard I would never pay $500 for a switching relay (which requires about 20 minutes to install) he offered to take $100 off his price if I supplied the part! In other words, he was making me the "wonderful" offer to charge me only $1200/hr for his installation time!!! Called the "sales manager" and he was smug, lecturing, defensive and TOTALLY unhelpful. I would NEVER do business with this company ever again. It's highway robbery!! The tech arrived and worked for approximately 90 minutes before ever quoting me the price. It was only AFTER he had uninstalled my existing relay that he quoted me the price of around $500 for a standard Honeywell relay that I just bought from Lowes for $80. The "Service Manager" went on-and-on on the phone about how it was like how a restaurant charges a lot more than the food cost for its dishes. Unfortunately, this "Service Manager" has NO IDEA what he is talking about. In a restaurant, a professional chef prepares the food with lots of other ingredients, it is then served in a pleasing environment, and there is service from waiters, busboys, maitre d, and sometimes the owner and chef. NONE of these things happen here. A tech spends 20 minutes installing a standard, off-the-shelf part to which the tech adds NO VALUE WHATSOEVER, and for that "service" these hucksters add $400 to the price of an $80 part!!! For 20 minutes of work that comes to $1200/hr. "Highway robbery" would be a kind way of phrasing it. Based on the fact that they DO NOT tell you up front how much it will cost, but only after 90 minutes of wasted time during which the tech accomplished nothing other than uninstalling my existing relay which I told him to put back, I would say "bait-and-switch" and virtual fraud would be more descriptive terms for the services that this company provides. Stay away from Heritage if you don't want to be massively ripped off and have your time wasted!"
Jonathan C on December 2018
Heritage Home Service is proud to serve residents from Northeast Massachusetts. We are the area’s premier home services provider and for 35+ years, we’ve brought the Heritage touch to homes throughout the state.
"My initial experience was good when I had Ryan come and rebuild the interior of the boiler and the associated electronics for a total of around $1500 including parts and lots of labor. Then when I called today to have a simple relay replaced, Richard arrived and these people at Heritage proved that they are hucksters of the first order. Stay away from them at all costs!! They tried to sell me a $80 off-the-shelf switching relay for $500!!! Then when I told Richard I would never pay $500 for a switching relay (which requires about 20 minutes to install) he offered to take $100 off his price if I supplied the part! In other words, he was making me the "wonderful" offer to charge me only $1200/hr for his installation time!!! Called the "sales manager" and he was smug, lecturing, defensive and TOTALLY unhelpful. I would NEVER do business with this company ever again. It's highway robbery!! The tech arrived and worked for approximately 90 minutes before ever quoting me the price. It was only AFTER he had uninstalled my existing relay that he quoted me the price of around $500 for a standard Honeywell relay that I just bought from Lowes for $80. The "Service Manager" went on-and-on on the phone about how it was like how a restaurant charges a lot more than the food cost for its dishes. Unfortunately, this "Service Manager" has NO IDEA what he is talking about. In a restaurant, a professional chef prepares the food with lots of other ingredients, it is then served in a pleasing environment, and there is service from waiters, busboys, maitre d, and sometimes the owner and chef. NONE of these things happen here. A tech spends 20 minutes installing a standard, off-the-shelf part to which the tech adds NO VALUE WHATSOEVER, and for that "service" these hucksters add $400 to the price of an $80 part!!! For 20 minutes of work that comes to $1200/hr. "Highway robbery" would be a kind way of phrasing it. Based on the fact that they DO NOT tell you up front how much it will cost, but only after 90 minutes of wasted time during which the tech accomplished nothing other than uninstalling my existing relay which I told him to put back, I would say "bait-and-switch" and virtual fraud would be more descriptive terms for the services that this company provides. Stay away from Heritage if you don't want to be massively ripped off and have your time wasted!"
Jonathan C on December 2018
For emergency services, please call 781-933-6387. N.E.T.R., Inc. is here to help homeowners install the best heating and cooling systems that fits their needs. Since 1989, we’ve installed heating and cooling systems in Boston and its surrounding areas, tackling tough problems that our clients face. Our goal is to ensure our clients have energy efficient, quiet, reliable systems so they can live their lives to the fullest both at home and at work. Our dedication to our customers’ needs is what drives us each and every day. Our approach to temperature control and comfort has helped us become one of the most respected names in heating, cooling, and refrigeration in New England
"I reached out to couple of companies and ultimately decided to go with NETR, and I’m glad I did. From the salesman Chip, to the installer Daniel Rodriguez, their professionalism was exceptional. Their work ethic and attention to detail sets them apart from other companies in this business. Daniel is an expert and went above and beyond to make sure everything was tidy and perfect! They’re really invested in customer satisfaction!"
Navya P on March 2024
For emergency services, please call 781-933-6387. N.E.T.R., Inc. is here to help homeowners install the best heating and cooling systems that fits their needs. Since 1989, we’ve installed heating and cooling systems in Boston and its surrounding areas, tackling tough problems that our clients face. Our goal is to ensure our clients have energy efficient, quiet, reliable systems so they can live their lives to the fullest both at home and at work. Our dedication to our customers’ needs is what drives us each and every day. Our approach to temperature control and comfort has helped us become one of the most respected names in heating, cooling, and refrigeration in New England
"I reached out to couple of companies and ultimately decided to go with NETR, and I’m glad I did. From the salesman Chip, to the installer Daniel Rodriguez, their professionalism was exceptional. Their work ethic and attention to detail sets them apart from other companies in this business. Daniel is an expert and went above and beyond to make sure everything was tidy and perfect! They’re really invested in customer satisfaction!"
Navya P on March 2024
Offering residential and commercial electrician services in and around New Hampshire.
"Professional service with exceptional care. The communication from start to finish was top notch. I will be hiring this team for all electrical needs for my home."
Liz L on April 2025
Offering residential and commercial electrician services in and around New Hampshire.
"Professional service with exceptional care. The communication from start to finish was top notch. I will be hiring this team for all electrical needs for my home."
Liz L on April 2025
I provide all of my customers with Prompt professional service. My 20 years of experience in the industry will be able to guide you in the right direction with any project
"Getting scheduled was a little difficult but I can't deduct any stars for that. Clearly Moses Electric is busy because they do quality work and the communication on getting scheduled was fantastic. I had them do four different things; they gave me a fair price and did it quickly and cleanly. They cleaned up after themselves -- no pieces of copper or wire jacketing laying around for the dog to find. I couldn't be happier."
Brian H on May 2025
I provide all of my customers with Prompt professional service. My 20 years of experience in the industry will be able to guide you in the right direction with any project
"Getting scheduled was a little difficult but I can't deduct any stars for that. Clearly Moses Electric is busy because they do quality work and the communication on getting scheduled was fantastic. I had them do four different things; they gave me a fair price and did it quickly and cleanly. They cleaned up after themselves -- no pieces of copper or wire jacketing laying around for the dog to find. I couldn't be happier."
Brian H on May 2025
New construction/ Remodels Kitchen and Bathrooms Pools and Spas Heating and cooling systems Whole House and Portable Generators Service upgrades and Panels changes Solar and Battery Systems EV Car Chargers
"Jerry was very communicative and explained everything very clearly. He arrived on time, completed the work quickly, and was affordable. Overall we are very happy with his service!"
Abbygail Z on January 2025
New construction/ Remodels Kitchen and Bathrooms Pools and Spas Heating and cooling systems Whole House and Portable Generators Service upgrades and Panels changes Solar and Battery Systems EV Car Chargers
"Jerry was very communicative and explained everything very clearly. He arrived on time, completed the work quickly, and was affordable. Overall we are very happy with his service!"
Abbygail Z on January 2025
With 35+ years of experience, we work hard to bring each customer the best possible service and quality available. We look forward to working with you on your next project. We welcome your questions and thank you for your interest.
"Prompt efficient and neat service. I will use them again"
Anthony R on February 2023
With 35+ years of experience, we work hard to bring each customer the best possible service and quality available. We look forward to working with you on your next project. We welcome your questions and thank you for your interest.
"Prompt efficient and neat service. I will use them again"
Anthony R on February 2023
JBJ SYSTEMS provides innovative security systems, including video surveillance and access control, as well as advanced structured cabling and network solutions. Our expert technicians bring together experience and knowledge with trusted solutions, delivering results on time and on budget.
JBJ SYSTEMS provides innovative security systems, including video surveillance and access control, as well as advanced structured cabling and network solutions. Our expert technicians bring together experience and knowledge with trusted solutions, delivering results on time and on budget.
Donahue & Son 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. 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.
"Well done"
Jer L on July 2024
Donahue & Son 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. 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.
"Well done"
Jer L on July 2024
Wetmore Electric Inc is an electrical contractor / electrician serving the Peabody, MA area. Our services include electric, commercial electric, electric repair, wiring, lighting installation, security lighting, generator installation, panel upgrades, energy efficient lighting, ceiling fan installation and network wiring. We serve Boston, Cambridge, Lynn, Somerville, Malden, Medford, Peabody, Revere, Salem, Beverly, Everett, Woburn, Chelsea, North Andover, Melrose, Saugus, Danvers, Wakefield, Reading, Stoneham, Wilmington, Winchester, Marblehead, Winthrop, Swampscott, North Reading, Ipswich, Lynnfield, South Hamilton, Boxford, Middleton, Georgetown, Topsfield, Rowley, Manchester, Wenham, Nahant, Essex, Byfield, East Arlington, East Boston, East Cambridge, East Lynn, Hamilton, Harvard Square, Hathorne, Manchester by the Sea, North Cambridge, Prides Crossing, South Boston, West Boxford, West Lynn, West Medford, West Somerville and Winter Hill.
"Highly recommend and will use again"
Joe B on October 2022
Wetmore Electric Inc is an electrical contractor / electrician serving the Peabody, MA area. Our services include electric, commercial electric, electric repair, wiring, lighting installation, security lighting, generator installation, panel upgrades, energy efficient lighting, ceiling fan installation and network wiring. We serve Boston, Cambridge, Lynn, Somerville, Malden, Medford, Peabody, Revere, Salem, Beverly, Everett, Woburn, Chelsea, North Andover, Melrose, Saugus, Danvers, Wakefield, Reading, Stoneham, Wilmington, Winchester, Marblehead, Winthrop, Swampscott, North Reading, Ipswich, Lynnfield, South Hamilton, Boxford, Middleton, Georgetown, Topsfield, Rowley, Manchester, Wenham, Nahant, Essex, Byfield, East Arlington, East Boston, East Cambridge, East Lynn, Hamilton, Harvard Square, Hathorne, Manchester by the Sea, North Cambridge, Prides Crossing, South Boston, West Boxford, West Lynn, West Medford, West Somerville and Winter Hill.
"Highly recommend and will use again"
Joe B on October 2022
I am a licensed electrical contractor specializing in residential wiring and standby home generators. I look forward to working with you on your next electrical project.
"Nice job and great people working for him."
Michael F on July 2024
I am a licensed electrical contractor specializing in residential wiring and standby home generators. I look forward to working with you on your next electrical project.
"Nice job and great people working for him."
Michael F on July 2024
Generator installations FAQs
Installing a whole-house generator costs about $5,000 on average. Prices range from $1,550 to $8,500, depending on size, brand, fuel type, and assembly. The size of your whole-house generator is the most significant cost factor, with large homes with high energy demands costing the most to power. Types of whole-home generators include:
Portable generators with 1kW–7.5kW capacity: $500–$2,000
Partial generators with 9kW–20kW capacity: $2,000–$6,300
Whole-house generators with 22kW–48kW: $5,000–$18,000
When maintained properly, a whole-house generator can last up to 20 years. Costs to maintain and repair generators vary by location and type of generator, but you can expect to pay about $150 to $300 per year for annual generator maintenance checks. An experienced generator service technician will inspect your generator’s engine filter, starting mechanism, fuel, lubrication, and coolant levels to keep your generator in good working condition for as long as possible.
When choosing the right size generator for your needs, consider a few items to help calculate the wattage you’ll need. Start by determining which household items and appliances you want to power, and then add the wattages together. Check out the wattage of these essential appliances:
Refrigerator: 600 watts
Large dehumidifier: 700 watts
Large window air conditioner: 1,400 watts
Water heater: 3,000 watts
Running home appliances like these requires a partial or whole-house generator. A portable generator may be enough to power your home if you only plan to keep a refrigerator and freezer running.
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 value of installing a whole-house generator is that your home has guaranteed power, even if the power grid in your area is down. Whether a whole-house generator is worth installing in your home depends on how often you use it, your home’s location, and your lifestyle. For example, installing a whole-house generator is likely worth it if you:
Experience frequent or prolonged power outages
Work from home
Store a lot of cold food
Have a sump pump
Have a pump for well water
Use electronic medical devices
Live in a climate requiring heating or cooling
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