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  • Average homeowner rating star icon4.8
    Average homeowner rating
  • Verified reviews icon23
    Verified energy efficiency auditing services reviews

Find Energy efficiency auditors in Williamstown

Avatar for Horizon Services

Horizon Services

17 Roland Avenue
4.42(
76
)
Approved Pro

Horizon Services

17 Roland Avenue
4.42(
76
)
Approved Pro
Customers say: Super punctual
828 local quotes requested
38 years of experience

Horizon Services is the region’s largest and most well respected plumbing, heating and air conditioning company, with nearly 600 employees serving tens of thousands of homeowners throughout Delaware, Southeastern Pennsylvania, Southern New Jersey, and Northeastern Maryland. After a quarter of a century in business, Horizon Services remains fully committed to setting the industry standard for customer service, installation, and focusing on things that are important to busy homeowners: respect for their time, their home and their property; up-front pricing, and an unconditional 100% money back guarantee.

"Peter was exceptional at his job, very knowledgeable. Inform me each step of the way during the process, very professional."

Keisha W on August 2025

Horizon Services is the region’s largest and most well respected plumbing, heating and air conditioning company, with nearly 600 employees serving tens of thousands of homeowners throughout Delaware, Southeastern Pennsylvania, Southern New Jersey, and Northeastern Maryland. After a quarter of a century in business, Horizon Services remains fully committed to setting the industry standard for customer service, installation, and focusing on things that are important to busy homeowners: respect for their time, their home and their property; up-front pricing, and an unconditional 100% money back guarantee.

"Peter was exceptional at his job, very knowledgeable. Inform me each step of the way during the process, very professional."

Keisha W on August 2025


Avatar for Hutchinson Plumbing Heating Cooling LLC

Hutchinson Plumbing Heating Cooling LLC

621 Chapel Ave
4.19(
237
)
Approved Pro

Hutchinson Plumbing Heating Cooling LLC

621 Chapel Ave
4.19(
237
)
Approved Pro
Customers say: Quality work
945 local quotes requested
77 years of experience

George H. Hutchinson, Sr., and sons William A. Hutchinson, Sr. and George H. Hutchinson, Jr. founded the Hutchinson family business in 1948. George and his sons started Hutchinson Engineering with their accumulated wealth – $35 in a cigar box – in rural Haddonfield, New Jersey. Serving all of South Jersey, Philadelphia, & Hunterdon, Middlesex, Monmouth, Ocean, Somerset, & portions of Warren & Westchester Counties.

"Company is way to expensive and the work was not mediocre. They use GoodLeap for financing, and they rip you off with that contract as well. Stay away!"

ROBERT B on March 2025

George H. Hutchinson, Sr., and sons William A. Hutchinson, Sr. and George H. Hutchinson, Jr. founded the Hutchinson family business in 1948. George and his sons started Hutchinson Engineering with their accumulated wealth – $35 in a cigar box – in rural Haddonfield, New Jersey. Serving all of South Jersey, Philadelphia, & Hunterdon, Middlesex, Monmouth, Ocean, Somerset, & portions of Warren & Westchester Counties.

"Company is way to expensive and the work was not mediocre. They use GoodLeap for financing, and they rip you off with that contract as well. Stay away!"

ROBERT B on March 2025


Avatar for BoundLess INC

BoundLess INC

No reviews yet

BoundLess INC

No reviews yet
20 years of experience

Welcome! I'm Maggie K! I'm a Renewable Energy Manager AND Expert @ BoundLess Energy! I Love what I do- and I do what I Love! I am here to help HomeOwners put an END to paying Utilitiy Providers endless amounts of money and feeling as though they have no choice but to deal with the unstable and sudden Rate Increases, that at times, happen as frequently as month-to-month! *Unsure on how Solar Energy works? I'm here to help you better understand! Solar Energy will efficiently and effectively POWER your Home! In addition to utilizing the SUN for Energy, I will also guarantee Homeowners who have a "Solar Viable Home", to expect a MINIMUM of 30% in savings overall- and the POTENTIAL to have a Final Bill of over 90% in savings, month-to-month! The Long Term Savings Potential is HUGE! And the Short Term Savings? Definitely a PLUS! Most Importantly- I work with HomeOwners to help them better understand the importance and urgency in going Solar! The most rewarding aspect of my Career is giving my Clients a sense of predictably, reliability, and security, they would have, by choosing to go Solar with BoundLess INC! My Goal- "TO HELP CREATE A PLANET RUN BY THE SUN"! *THINGS 2 REMEMBER* ***CURRENTLY IN NEW JERSEY- HOMEOWNERS ARE ABLE TO GO SOLAR, ENTIRELY AT NO COST AT ALL! ***MEANING- FROM START TO FINISH- GOING SOLAR IN NJ, IS COMPLETELY &+ CURRENTLY FREE TO ALL HOMEOWNERS WITH A *SOLAR VIABLE HOME* *** HOMEOWNERS WILL PAY $0.00 TO BOUNDLESS INC, IN TRANSFORMING THEIR HOUSE INTO A HOME RUN BY THE SUN!!! **(*NO COST SOLAR PROGRAM- AS PER NJ STATE &+ GOVERNMENT LAW*)** *(SKEPTICAL ABOUT GOING SOLAR?)* CALL OR TEXT ME ANYTIME! (201)-885-8309 ***IM HERE TO HELP YOU IN CLEARING THINGS UP! I AM HERE TO HELP SHOW YOU, THAT THE TIME TO GO SOLAR WAS YESTERDAY- HOWEVER, I WILL HELP YOU UNDERSTAND &+ SEE THE IMPORTANCE- IN WHY CHOOSING SOLAR ENERGY TODAY, IS STILL A FINANCIALLY SMART DECISION FOR TOMORROW"!

Welcome! I'm Maggie K! I'm a Renewable Energy Manager AND Expert @ BoundLess Energy! I Love what I do- and I do what I Love! I am here to help HomeOwners put an END to paying Utilitiy Providers endless amounts of money and feeling as though they have no choice but to deal with the unstable and sudden Rate Increases, that at times, happen as frequently as month-to-month! *Unsure on how Solar Energy works? I'm here to help you better understand! Solar Energy will efficiently and effectively POWER your Home! In addition to utilizing the SUN for Energy, I will also guarantee Homeowners who have a "Solar Viable Home", to expect a MINIMUM of 30% in savings overall- and the POTENTIAL to have a Final Bill of over 90% in savings, month-to-month! The Long Term Savings Potential is HUGE! And the Short Term Savings? Definitely a PLUS! Most Importantly- I work with HomeOwners to help them better understand the importance and urgency in going Solar! The most rewarding aspect of my Career is giving my Clients a sense of predictably, reliability, and security, they would have, by choosing to go Solar with BoundLess INC! My Goal- "TO HELP CREATE A PLANET RUN BY THE SUN"! *THINGS 2 REMEMBER* ***CURRENTLY IN NEW JERSEY- HOMEOWNERS ARE ABLE TO GO SOLAR, ENTIRELY AT NO COST AT ALL! ***MEANING- FROM START TO FINISH- GOING SOLAR IN NJ, IS COMPLETELY &+ CURRENTLY FREE TO ALL HOMEOWNERS WITH A *SOLAR VIABLE HOME* *** HOMEOWNERS WILL PAY $0.00 TO BOUNDLESS INC, IN TRANSFORMING THEIR HOUSE INTO A HOME RUN BY THE SUN!!! **(*NO COST SOLAR PROGRAM- AS PER NJ STATE &+ GOVERNMENT LAW*)** *(SKEPTICAL ABOUT GOING SOLAR?)* CALL OR TEXT ME ANYTIME! (201)-885-8309 ***IM HERE TO HELP YOU IN CLEARING THINGS UP! I AM HERE TO HELP SHOW YOU, THAT THE TIME TO GO SOLAR WAS YESTERDAY- HOWEVER, I WILL HELP YOU UNDERSTAND &+ SEE THE IMPORTANCE- IN WHY CHOOSING SOLAR ENERGY TODAY, IS STILL A FINANCIALLY SMART DECISION FOR TOMORROW"!


Avatar for RSS Solar

RSS Solar

Aurora Ave.
No reviews yet

RSS Solar

Aurora Ave.
No reviews yet
Free onsite estimate

We make solar simple-- We are dedicated to making solar energy affordable and accessible to everyone-- with ZERO upfront costs.* Your home can become its own tiny power station and generate plenty of reliable energy, all while reducing your electricity bill. Plus, it doesn't hurt that your greener lifestyle will help your state achieve its renewable energy goals.

We make solar simple-- We are dedicated to making solar energy affordable and accessible to everyone-- with ZERO upfront costs.* Your home can become its own tiny power station and generate plenty of reliable energy, all while reducing your electricity bill. Plus, it doesn't hurt that your greener lifestyle will help your state achieve its renewable energy goals.


Avatar for Power Marketing Group, LLC

Power Marketing Group, LLC

2075 Byberry Rd
5.00(
6
)

Power Marketing Group, LLC

2075 Byberry Rd
5.00(
6
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

Are you looking to save money on your energy bill? Power Marketing Group, LLC is your licensed energy broker and solar dealer in PA and NJ. In business since 2011, working with energy suppliers in deregulated markets to bring various energy products to residential and commercial customers. Our management team has a combined 50+ years of experience in the energy industry. We deliver products directly to consumers with a professional and personal touch, and we provide our customers choices with low rates, price protection, renewable power, solar incentives, rewards programs, and many other benefits of the alternative energy market. We have partnered with the best solar providers in the country to offer our customers new ways they can control their energy costs, take advantage of Federal and State incentives, along with helping improve the environment by utilizing the power of the Sun!

"It went great"

Nelson K on August 2022

Are you looking to save money on your energy bill? Power Marketing Group, LLC is your licensed energy broker and solar dealer in PA and NJ. In business since 2011, working with energy suppliers in deregulated markets to bring various energy products to residential and commercial customers. Our management team has a combined 50+ years of experience in the energy industry. We deliver products directly to consumers with a professional and personal touch, and we provide our customers choices with low rates, price protection, renewable power, solar incentives, rewards programs, and many other benefits of the alternative energy market. We have partnered with the best solar providers in the country to offer our customers new ways they can control their energy costs, take advantage of Federal and State incentives, along with helping improve the environment by utilizing the power of the Sun!

"It went great"

Nelson K on August 2022


Katcave HVAC has been repairing and installing heating and air conditioning systems for over 10 years. Emergency service also available. Contact us today! Se habla español.


National Energy Partners

1103 Laurel Oak Rd
No reviews yet

National Energy Partners

1103 Laurel Oak Rd
No reviews yet

National Energy Partners (NEP) is a solar energy development company dedicated to bringing clean, renewable energy to businesses and residential consumers alike. At the forefront of the solar energy landscape, our passion is in fostering relationships through integrity, knowledge and efficiency. NEP embraces the specific needs and challenges of each project, offering our valued clients the best experience through strategic management, trusted relationships and eco-friendly solar energy solutions. With over 10 years of experience in the solar industry, our portfolio includes over $100 million of projects with more in development.

National Energy Partners (NEP) is a solar energy development company dedicated to bringing clean, renewable energy to businesses and residential consumers alike. At the forefront of the solar energy landscape, our passion is in fostering relationships through integrity, knowledge and efficiency. NEP embraces the specific needs and challenges of each project, offering our valued clients the best experience through strategic management, trusted relationships and eco-friendly solar energy solutions. With over 10 years of experience in the solar industry, our portfolio includes over $100 million of projects with more in development.


S&M Mechanical LLC

401 W Kings Hwy
5.00(
9
)

S&M Mechanical LLC

401 W Kings Hwy
5.00(
9
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

S&M Mechanical LLC is a fully licensed and insured company. We can take care of any heating and AC needs that you may have. I have 25+ years of experience in the field and do work in both residential and commercial sides of the field. Financing is also an available option tnrough S&M Mechanical LLC

"I had a hot water boiler replaced. It was a painless experience. Unlike some other companies that came out to quote this job. When I told Scott what I was looking to do he did not try to sell me on things in didn’t want. He was professional, showed up on time. Work performed looks great and they respected my house as if it was there own. I would use S&M Mechanical LLC again."

Christian S on October 2018

S&M Mechanical LLC is a fully licensed and insured company. We can take care of any heating and AC needs that you may have. I have 25+ years of experience in the field and do work in both residential and commercial sides of the field. Financing is also an available option tnrough S&M Mechanical LLC

"I had a hot water boiler replaced. It was a painless experience. Unlike some other companies that came out to quote this job. When I told Scott what I was looking to do he did not try to sell me on things in didn’t want. He was professional, showed up on time. Work performed looks great and they respected my house as if it was there own. I would use S&M Mechanical LLC again."

Christian S on October 2018


Avatar for USA Alarm Service, Inc

USA Alarm Service, Inc

510 S Clearwater Loop
No reviews yet

USA Alarm Service, Inc

510 S Clearwater Loop
No reviews yet
29 years of experience

USA Alarm is a national company that has more than two decades of experience and an award winning command center that protects more than 700,000 homes and businesses through the United States, 24 hours a day and 7 days a week. We have offices located throughout the US, with two main offices in Indianapolis, Indiana and Post Falls, Idaho.

USA Alarm is a national company that has more than two decades of experience and an award winning command center that protects more than 700,000 homes and businesses through the United States, 24 hours a day and 7 days a week. We have offices located throughout the US, with two main offices in Indianapolis, Indiana and Post Falls, Idaho.


All Trades Combined, Inc.

130 Green St
4.00(
3
)

All Trades Combined, Inc.

130 Green St
4.00(
3
)
Customers say: Quality work
27 years of experience

We are general mechanical electrical contractors specializing in residential and commercial applications your one stop shop for all your needs

"We hired this contractor almost a year ago to do various projects. The work was supposed to be finished in 10 days according to the contract. We are here almost a year later and there is still work that is unfinished. I paid Martin before all of the work was completed, and I can’t get ahold of him to finish the work now. The pipe still hasn’t been cut, and there is still a huge piece of concrete in our side yard. I’m not sure what to do now."

Franklyn R on August 2021

We are general mechanical electrical contractors specializing in residential and commercial applications your one stop shop for all your needs

"We hired this contractor almost a year ago to do various projects. The work was supposed to be finished in 10 days according to the contract. We are here almost a year later and there is still work that is unfinished. I paid Martin before all of the work was completed, and I can’t get ahold of him to finish the work now. The pipe still hasn’t been cut, and there is still a huge piece of concrete in our side yard. I’m not sure what to do now."

Franklyn R on August 2021

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Energy Efficiency Auditing questions, answered by experts

Modern windows provide enhanced UV protection, improved heat retention, and cooling efficiency, contributing to overall household energy savings.

If you install LED bulbs, they will use much less energy than incandescent bulbs. LED light strips also use less power. Battery-operated puck lights use no electricity at all, but you will need to replace the batteries as needed. They are beneficial if your power goes out, too, as they will remain on as a light source. 

Solar water heating systems are not one-size-fits-all. You'll likely work with a team of experts to get the job done—including solar panel installers, plumbers, and water heater installers. A specialist will help you decide if a passive or active system is best for your local weather, home layout, roof stability, and your budget.

It’s not recommended to turn off your breaker box in hopes of saving electricity. Breaker boxes were not designed to constantly be switched on and off. Therefore, turning off breakers unnecessarily can cause costly damage that outnumbers any energy savings. Only flip your breakers if absolutely necessary when troubleshooting an electrical issue.

Absolutely! Especially if you have an older home that currently doesn’t have air conditioning where installing ductwork just wouldn't work. No one likes being hot in the warmer months, so if you’re looking to sell your home in the near future, installing a ductless mini-split AC can be a good way to enjoy your home more while you’re in it, boost the return on your sale, and serve as a perk to peak buyers’ interest.

The Williamstown, NJ homeowners’ guide to energy efficiency auditing services

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.
  • 🌱 "Mow a small front yard"
  • 🛠 "Fix a leaking pipe under the sink"
  • 🏠 "Repair shingles on an asphalt roof"