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Top-Rated Energy efficiency auditors in Duncan - Updated Nov 2026

EnergySmith Home Performance
4.8(
164
)
Home Energy Audit

Serving Duncan, SC and surrounding areas

Approved

Super Service Award Winner

In business since 2005

Free estimates

Credit card accepted

"I received the company's info through Duke Energy. The owner came out to the house within a couple of days to complete an assessment and provide a quote. Once I had some other work completed, I called back to schedule the appointment for removal and install, and they came out within a couple days, removed all the old insulation and blew in the new insulation. They were done, cleaned up and gone, before I ended my workday. Excellent job and crew! When I complete add-ons in the future, they will be the company to handle the insulation."
Response time2 days
37 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Holler Home Inspections LLC
Holler Home Inspections LLC
New to Angi
Home Energy Audit

Serving Duncan, SC and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

Meet Your Home Inspector - Hi there! I’m Dylan Osborne, North Carolina Licensed and InterNACHI Certified Professional Home Inspector – CPI. I hold a Degree in Applied Science; Architecture & Construction Technologies, and 25 years of experience in land surveying, commercial property maintenance, and general manager for a 10-building, 75-unit condo complex in the US Virgin Islands. After Hurricanes Irma and Maria hit in 2017, I supervised the rebuild of the property tougher, stronger, and better than before – complete with a half-megawatt backup generator.\n\nMy knowledge, training, and experience allow me to bring a get-it-done-right attitude to every home inspection. I look forward to putting that knowledge and experience to work for you! \n828-760-7716

Dylan Osborne CPI
Avatar for ADT Solar
ADT Solar
4.4(
111
)
Energy Audit - For BusinessHome Energy Audit

Serving Duncan, SC and surrounding areas

In business since 2008

Free estimates

Warranties offered

"They installed solar panels as per contract. They were on time and removed all material when done. I had roof damage from a storm and they repaired it at no extra cost. So far I am happy with this company and plan on using them again for house repair.
"
11 kW PV Installation
5 kW PV Installation
9.5 kW PV Installation
Recommended by89%of homeowners
Avatar for Corley Plumbing Air Electric Inc
Corley Plumbing Air Electric Inc
4.0(
453
)
Energy Audit - For BusinessHome Energy Audit

Serving Duncan, SC and surrounding areas

In business since 1986

Emergency services offered

"It was thrilling. Without the Corley guys’ diagnostic and electrical expertise, the house would probably have burned down. Seriously. This was a bona fide emergency. It was puzzling and difficult for them, and stressful for us — before it was over, I had evacuated the house — and we were making weak jokes about poltergeists and exorcists… but apparently a squirrel had chewed up the Duke Energy line, sending thousands of units of raw electrical power into the house! ????? Afterwards, I needed a vacation somewhere — anywhere — quiet… but thanks to Corley, we have a house, new wires, and are (relatively) sane. Thanks again, Corley crew! ❤️❤️❤️"
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+5

Recommended by77%of homeowners
Avatar for Dipple Plumbing, Electrical, Heating & Air
Dipple Plumbing, Electrical, Heating & Air
4.2(
98
)
Energy Audit - For BusinessHome Energy Audit

Serving Duncan, SC and surrounding areas

In business since 1979

Emergency services offered

Credit card accepted

"Arrived on time, Ryan and Danny took the time to understand what needed to be done, verified in the oven manual for specs for hookup, and ran the replacement circuit. Outlets took a little more time due to house wiring (not their fault) but never felt rushed. Great job.
"
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+6

Recommended by88%of homeowners
Avatar for Energy Sharks Heating & Air
Energy Sharks Heating & Air
4.4(
39
)
Energy Audit - For BusinessHome Energy Audit

Serving Duncan, SC and surrounding areas

In business since 2012

Free estimates

Credit card accepted

"I got proposals from 3 other contractors, all had very similar higher cost approaches.  One of these contractors has been maintaining my system for years.  Energy Sharks is different, 
Phil is special, he has a technical skill and product knowledge to specify the right equipment to meet our needs that exceeded our expectations.  He is a master at understanding where to spend our dollars to get the most benefit.  Costly features that sound good but have little payback are vetted by Phil.  He knows.  He even thoughtfully considered how to maximize our Energy rebates and tax credits by selecting the right eligible products ($950). 
The workmanship of the installation was Excellent.  Danny arrived on time and completed in the time period (less than 1 day) during the one of the coldest days of the year.  The system works great and I could not be more pleased. 
Thanks for a Great Job!
"
Commercial Oven Wraps
LED & CFL Bulbs
Duct Sealing
Recommended by88%of homeowners
Avatar for HIS Heating and Cooling of the Midlands
HIS Heating and Cooling of the Midlands
4.6(
19
)
Energy Audit - For BusinessHome Energy Audit

Serving Duncan, SC and surrounding areas

In business since 2016

Free estimates

Emergency services offered

"Professional and knowledgeable! His Heating and Cooling was on time and the service was done in a timely manner. I would recommend this small business over the large companies. The family oriented, friendly and top notch service cannot be compared. His Heating and Cooling will soon be a household brand!"
3.5 Ton Airtemp Gas Package System Installation
2 ton Airtemp Heatpump Condenser Installation
2 ton Airtemp airhandler 5kw heatstrips Installation
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+29

Recommended by94%of homeowners
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Energy Efficiency Auditing FAQs, answered by experts

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.

Wood windows fall in the middle of the window frame materials when it comes to energy efficiency. They’re more insulating than aluminum and vinyl, but they aren’t as efficient as fiberglass or composite frames. If you love the look and lifespan of wood windows and want to maximize efficiency, you can upgrade to double-pane or triple-pane glass and consider window tinting and low-emissivity (low-E) coatings to minimize heat transfer.

Smart glass doesn’t use a lot of electricity, and you can expect a standard window to add between $1 and $2 per year to your electric bills. Smart glass is proof that energy-efficient windows work. Although your smart windows may consume a little energy to operate, they can save enough energy to offset the costs. If you’re concerned about the minimal bump to your electricity consumption, you can opt for smart tint, which doesn’t require electricity to work.

Leaving lights on raises the electric bill, but not as much as having high-wattage light bulbs. The best way to save on electric costs is to swap your light bulbs to LED or CFL bulbs that use far fewer watts. You can also use smart lights and light switches to control usage via a smartphone or voice-controlled device.

Installing weather stripping or upgrading to insulated panels can improve efficiency.

The Duncan, SC homeowners’ guide to energy efficiency auditing services

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