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TRUSTED BY CORNELIUS, NC HOMEOWNERS

  • Average homeowner rating star icon4.3
    Average homeowner rating
  • Verified reviews icon12
    Verified energy efficiency auditing services reviews

Find Energy efficiency auditors in Cornelius

Avatar for GSM Services

GSM Services

407 E Long Ave
4.71(
100
)
Approved Pro

GSM Services

407 E Long Ave
4.71(
100
)
Approved Pro
Customers say: Super punctual
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers
276 local quotes requested

We are a licensed and insured HVAC and home services contractor, delivering fast, affordable, and top-quality work backed by a 100% satisfaction guarantee. With over 98 years in business, we’ve earned a reputation for exceptional customer service, reliability, and trust. As your one-stop solution for home comfort, we specialize in improving comfort, energy efficiency, air quality, and the overall health of your home’s environment. Heating & Cooling Repairs • HVAC Install & Replacements • Insulation • Air Duct Cleaning • Dryer Vent Cleaning • Home Energy Audits • Crawl Space Encapsulations • Attic & Crawl Space Improvement Services • Standby Generators • Air Quality & Home Mold Solutions • Dehumidifiers • Ductwork Repair & Replacement • FREE HVAC Service Calls with Repair • FREE Online Quote on New Heating & Cooling Systems • FREE Insulation Evaluations • FREE Crawl Space Evaluations • FREE Home Energy Audits

"Everything was seamless! Great job"

Amanda R on April 2023

We are a licensed and insured HVAC and home services contractor, delivering fast, affordable, and top-quality work backed by a 100% satisfaction guarantee. With over 98 years in business, we’ve earned a reputation for exceptional customer service, reliability, and trust. As your one-stop solution for home comfort, we specialize in improving comfort, energy efficiency, air quality, and the overall health of your home’s environment. Heating & Cooling Repairs • HVAC Install & Replacements • Insulation • Air Duct Cleaning • Dryer Vent Cleaning • Home Energy Audits • Crawl Space Encapsulations • Attic & Crawl Space Improvement Services • Standby Generators • Air Quality & Home Mold Solutions • Dehumidifiers • Ductwork Repair & Replacement • FREE HVAC Service Calls with Repair • FREE Online Quote on New Heating & Cooling Systems • FREE Insulation Evaluations • FREE Crawl Space Evaluations • FREE Home Energy Audits

"Everything was seamless! Great job"

Amanda R on April 2023


Avatar for Comfort Monster Heating & Air / Absolute

Comfort Monster Heating & Air / Absolute

11001 W Tremont Ave
4.79(
221
)
Approved Pro

Comfort Monster Heating & Air / Absolute

11001 W Tremont Ave
4.79(
221
)
Approved Pro
Customers say: True professional
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers
95 local quotes requested

For a limited time, we're offering $0 diagnostic calls for first-time customers! Estimates for a new home comfort system are always 100% free. We are a full service Heating and Air Conditioning Company providing quality service and installation to homeowners in Charlotte, NC, and the surrounding areas in both North and South Carolina. Our team of licensed HVAC professionals are on a mission to give you the BEST customer service experience you've ever had. Our technicians have an average of 12 years of HVAC experience, and are here to help answer all of your HVAC questions. At Comfort Monster Heating & Air, We Provide Service So Good, It's Scary!

"Gabe came through and dis a great job with the AC service. He was very knowledgeable and courteous"

Valerie N on February 2025

For a limited time, we're offering $0 diagnostic calls for first-time customers! Estimates for a new home comfort system are always 100% free. We are a full service Heating and Air Conditioning Company providing quality service and installation to homeowners in Charlotte, NC, and the surrounding areas in both North and South Carolina. Our team of licensed HVAC professionals are on a mission to give you the BEST customer service experience you've ever had. Our technicians have an average of 12 years of HVAC experience, and are here to help answer all of your HVAC questions. At Comfort Monster Heating & Air, We Provide Service So Good, It's Scary!

"Gabe came through and dis a great job with the AC service. He was very knowledgeable and courteous"

Valerie N on February 2025


Efficiency 1st

4988 Hot Rod Road
No reviews yet

Efficiency 1st

4988 Hot Rod Road
No reviews yet
3 years of experience

Welcome to Efficiency 1st, your trusted partner in creating a more comfortable, healthier, and energy-efficient home. Our team's deep expertise in building science, coupled with a commitment to sustainability, enables us to take a holistic, performance-based approach to your home's energy retrofit needs. Whether you're looking to enhance your indoor air quality, improve your home's insulation, or simply wish to lower your energy bills, we're here to guide you every step of the way. Together, let's unlock the potential of your home and contribute to a more sustainable future.

Welcome to Efficiency 1st, your trusted partner in creating a more comfortable, healthier, and energy-efficient home. Our team's deep expertise in building science, coupled with a commitment to sustainability, enables us to take a holistic, performance-based approach to your home's energy retrofit needs. Whether you're looking to enhance your indoor air quality, improve your home's insulation, or simply wish to lower your energy bills, we're here to guide you every step of the way. Together, let's unlock the potential of your home and contribute to a more sustainable future.


Home Shield Insulation

11107 Painted Tree Road
5.00(
6
)

Home Shield Insulation

11107 Painted Tree Road
5.00(
6
)
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

We are new to Angie’s but are experienced with anything insulation related! Home Shield Insulation is proud to bring the benefits of energy efficiency, comfort, and improved air quality to home owners in the Charlotte metro area.

"It went great! Awesome team and good prices. Really appreciate the work!"

Olivia B on February 2025

We are new to Angie’s but are experienced with anything insulation related! Home Shield Insulation is proud to bring the benefits of energy efficiency, comfort, and improved air quality to home owners in the Charlotte metro area.

"It went great! Awesome team and good prices. Really appreciate the work!"

Olivia B on February 2025


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.


RetroFoam of the Carolinas

313 Motz Ave
5.00(
4
)

RetroFoam of the Carolinas

313 Motz Ave
5.00(
4
)
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

RetroFoam of the Carolinas is an insulation contractor that provides injection and open and closed cell spray foam insulating solutions for existing homes, new homes, and pole barns across the Carolinas and Virginia. Our mission is to help homeowners minimize their energy waste and create more energy-efficient, healthy, quieter homes. RetroFoam of the Carolinas is operated by a fun-loving team of construction professionals with over 25 years of experience in the industry. The team comprises service-minded, problem-solving people that are excited to talk to you at your level of expertise. Happy clients and energizing relationships are what get us up in the morning. We are always quick with a smile, and always excited to talk with anyone about how to make their homes more comfortable.

"The crew from RetroFoam handled our project great from start to finish. The team was very professional and got everything done the way we expected. Would definitely recommend!"

Shaun W on November 2021

RetroFoam of the Carolinas is an insulation contractor that provides injection and open and closed cell spray foam insulating solutions for existing homes, new homes, and pole barns across the Carolinas and Virginia. Our mission is to help homeowners minimize their energy waste and create more energy-efficient, healthy, quieter homes. RetroFoam of the Carolinas is operated by a fun-loving team of construction professionals with over 25 years of experience in the industry. The team comprises service-minded, problem-solving people that are excited to talk to you at your level of expertise. Happy clients and energizing relationships are what get us up in the morning. We are always quick with a smile, and always excited to talk with anyone about how to make their homes more comfortable.

"The crew from RetroFoam handled our project great from start to finish. The team was very professional and got everything done the way we expected. Would definitely recommend!"

Shaun W on November 2021


EcoGreen Home Services

20100 Zion Ave
5.00(
9
)

EcoGreen Home Services

20100 Zion Ave
5.00(
9
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

Our vision is to create a better tomorrow by offering Plumbing, Electrical, HVAC equipment and indoor air quality products that offers the highest level of efficiency and keeps your home and family safe, clean and comfortable. We hope that you will join us.

"It was successful.Works like a charm.They were very professional and very respectful.A 5 star company."

Glenn R on December 2021

Our vision is to create a better tomorrow by offering Plumbing, Electrical, HVAC equipment and indoor air quality products that offers the highest level of efficiency and keeps your home and family safe, clean and comfortable. We hope that you will join us.

"It was successful.Works like a charm.They were very professional and very respectful.A 5 star company."

Glenn R on December 2021


Air Tech

2179 Charlotte Hwy
4.43(
7
)

Air Tech

2179 Charlotte Hwy
4.43(
7
)
Customers say: Quick response
6 years of experience

Since 2012, Air Tech has offered quality services with professional attention that our clients deserve. Contact us to know more about Air conditioning repair service.

"We will never use this company again. They were not upfront on their labor charge for a part under warranty and then threatened us to send us to collections when we asked to meet them half way. They also tried selling us an air scrubber yet neglected to tell us the reason we are having a mold issue is because the seal between the house and the unit has holes in it. They also did not put back things moved to get to the unit and crawl space. It is unfortunate that there are companies out there who choose to do business in this manor."

Colleen S on December 2022

Since 2012, Air Tech has offered quality services with professional attention that our clients deserve. Contact us to know more about Air conditioning repair service.

"We will never use this company again. They were not upfront on their labor charge for a part under warranty and then threatened us to send us to collections when we asked to meet them half way. They also tried selling us an air scrubber yet neglected to tell us the reason we are having a mold issue is because the seal between the house and the unit has holes in it. They also did not put back things moved to get to the unit and crawl space. It is unfortunate that there are companies out there who choose to do business in this manor."

Colleen S on December 2022



"They were great to work with and quick, polite and explained the timeline of needing to replace the unit and my repair cost would go towards the replacement."

Susan E on July 2020

Heating & A/C, Energy Efficiency Auditing

"They were great to work with and quick, polite and explained the timeline of needing to replace the unit and my repair cost would go towards the replacement."

Susan E on July 2020

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Energy Efficiency Auditing questions, answered by experts

Smart home upgrades can be worth the money. Several upgrades, including smart thermostats and ceiling fans, can help reduce your energy bills. Others make life more convenient, freeing up your time to do what you love (or get more work done). And some smart home upgrades, such as entertainment systems, simply make life more enjoyable. All are worthy causes.

Services by electricians can quickly get expensive, but there are a few ways you can save money in the process:

  • Bundle multiple jobs done at the same time to save on trip fees or flat fees for individual projects.

  • Get at least three quotes for service to find the best deal.

  • Buy fixtures, switches, outlets, and other materials beforehand to avoid product markup.

  • If you feel comfortable with it, have an apprentice or journeyman complete the work under the supervision of a master electrician. These electricians in training tend to charge less per project.

While you can perform many routine home maintenance jobs yourself, it’s often a good idea to bring pros in for certain tasks. HVAC maintenance, fireplace and chimney inspections, foundation repairs, and roof inspections and repairs should be handled by professionals who know what to look for and can safely perform repairs. You may also find it helpful to hire a local house cleaning service to help with deep cleaning.

Electric bills tend to be lower in spring and fall because people use less electricity during these seasons. Milder temperatures allow for less use of heating and cooling, unlike during winter and summer, which usually bring more extreme temperatures.

Heat pumps transfer existing heat instead of generating it, using less energy. Compared to baseboard heaters, they can reduce heating costs by up to 50% and provide efficient cooling, lowering electricity bills and carbon footprint.

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The Cornelius, NC homeowners’ guide to energy efficiency auditing services

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