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Best energy efficiency auditors near Johnston, SC

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

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

Serving Johnston, SC and surrounding areas

In business since 2008

Free estimates

Warranties offered

"I was considering 3 companies to do the work. They provided the best deal. The installation went very smoothly; finished in a day. Very happy with the process to that point. Had some problems with some logistics afterward. The papers weren't processed properly to iniitally run the solar panels (it took 2 months till we figured out the electric company hadn't 'turned on' the panels). There was also some problems with the paperwork for the tax rebates that slowed things down. I talked to the owner Mark, who was very sorry for the problems and offered a small refund, even though we don't really know what happened. He wanted to be sure I was a happy customer, which I am. I was impressed by his professionalism. However, I'm still not seeing the savings that I was told. I've had my house energy audited, installed Nest thermostats, and still not seeing a major decrease in my KWh usage. I can only assume that we are having a hotter season than last year; hoping to realize savings next year.
"
11 kW PV Installation
5 kW PV Installation
9.5 kW PV Installation
Recommended by89%of homeowners
Avatar for South Carolina Solar Project
South Carolina Solar Project
5.0(
9
)
Energy Audit - For BusinessHome Energy Audit

Serving Johnston, SC and surrounding areas

In business since 2017

Free estimates

"Jon Mason with South Carolina Solar Project did an amazing job start to finish. From the initial consultation and review of solar energy to the installation, topnotch professionalism. Jon's technical expertise, financial knowledge and passion for solar energy is evident and assured me that I was making the right choice to go Solar. I would, and have, highly recommend South Carolina Solar Project to anyone looking to go Solar!"
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+61

Recommended by100%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 Johnston, SC and surrounding areas

In business since 2016

Free estimates

Emergency services offered

HIS Heating And Cooling of the Midlands has the experience and dedication to make sure your job is done right. We are owner operated and I make sure to provide a high quality service that can't be beat. Please call or click to schedule an estimate today!

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
Avatar for R&J Solar LLC
R&J Solar LLC
5.0(
2
)
Energy Audit - For BusinessHome Energy Audit

Serving Johnston, SC and surrounding areas

In business since 2022

Free estimates

Credit card accepted

We provide residential and commercial solar power options, and provide support services for industry partner companies. We offer no cost consultations and $0 down financing. Please contact our office for a consultation at (931)922-8258.

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+3

Recommended by100%of homeowners
Solar Services USA
5.0(
2
)
Home Energy Audit

Serving Johnston, SC and surrounding areas

In business since 2019

Free estimates

Credit card accepted

At Solar Services USA, we pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Feel free to book online with us today!

Response time6 hrs
Recommended by100%of homeowners
Russell Briggman
4.5(
1
)
Energy Audit - For BusinessHome Energy Audit

Serving Johnston, SC and surrounding areas

In business since 2010

Free estimates

Credit card accepted

You can depend on us to provide a high quality service at a fair and honest price. We understand that the future of our business depends upon our reputation and that is why customer service is by far our highest priority. If you are looking for a professional you can trust, please call today to schedule a no-obligation estimate!

Response time1 day
Recommended by100%of homeowners
Inviro Design & Consulting, LLC
5.0(
1
)
Energy Audit - For BusinessHome Energy Audit

Serving Johnston, SC and surrounding areas

In business since 2009

Free estimates

Welcome to Inviro Design & Consulting, LLC. We take pride in the quality of work and customer satisfaction that we give each and every customer! We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Call us today to learn more about how we can help you! \n \n

Response time1 day
Response rate92%
Recommended by100%of homeowners
Shiloh Energy Projects LLC
New to Angi
Energy Audit - For BusinessHome Energy Audit

Serving Johnston, SC and surrounding areas

In business since 2021

Free estimates

Credit card accepted

Were honest, dependable and trying to lead the way for Solar Energy in the Upstate. We are local and are willing to travel. I am excited to work with you on your project. Reliability and quality are our mission. Solar panel installs is our expertise but check out all that we offer. Call for an estimate today!

Response time5 days
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Energy Efficiency Auditing FAQs, answered by experts

Yes, these services often increase home value by preventing moisture-related issues and enhancing the usable space in basements or crawlspaces.

R-value is calculated by dividing the thickness of an insulation material by its thermal conductivity. The material's composition and density influence thermal conductivity. Materials with lower conductivity values provide better insulation. The higher the R-value, the better the material is at insulating, helping homeowners select insulation that meets the energy needs of their climate and home layout.

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.

Depending on the level of audit you choose, a home energy audit will at least include a walk-through of the home to determine visible inefficiencies, but may include testing and a highly detailed inspection and report laying out the home’s inefficiencies and providing recommendations to fix those issues. The audit may also include a review of utility bills and mechanical testing. Consult your home energy auditor about the types of services they provide before hiring.

If you have central air conditioning, it’s fine to run your AC all day if that’s what you want—as long as the AC unit is in good condition. But if your AC runs constantly when you don’t want it to, there may be a problem with your system (like the ones we’ve mentioned above). Window AC units and wall air conditioners aren’t as powerful as central AC, so you should only run those kinds of air conditioners for eight to 12 hours at a time.

The Johnston, 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.