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*The Angi rating for Energy Efficiency Auditing companies in Marshall, IL is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Energy Efficiency Auditing needs.

*The HomeAdvisor rating for Energy Efficiency Auditing companies in Marshall, IL is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Energy Efficiency Auditing needs.

Last update on September 30, 2025

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

SUPER HEATING & COOLING
4.6(
40
)
Energy Audit - For BusinessHome Energy Audit

Serving Marshall, IL and surrounding areas

In business since 2006

Emergency services offered

Credit card accepted

"I’ve had others look at the furnace with the same problem coming up again soon after. Super Heating and Cooling came out the day I called them. Fixed the problem and his bill was very reasonable. He was courteous, answered my questions and his work fixed the problem. I won’t be calling anyone else for my hearing and cooling needs."
Recommended by91%of homeowners
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Avatar for USA Insulation of Indianapolis
USA Insulation of Indianapolis
4.0(
73
)
Energy Audit - For BusinessHome Energy Audit

Serving Marshall, IL and surrounding areas

In business since 2009

Free estimates

Credit card accepted

"If you're looking for an A-player insulation contractor, I would recommend looking elsewhere. 
The energy consultant arrived on time and was friendly.   The estimate process was somewhat of a joke.   Basically, whatever I pointed to and said I'm interested in having something done, his response was "yeah we can do that" and then quoted some #'s from his head.   Really didn't take any time to look at anything in depth.  Didn't even go in the crawlspace to really see the extent of what needed to be done.   This compares to another company that came out and did blower-door test and used infrared thermometer equipment to check for heat loss (no charge).
The energy consultant said he would follow up with a quote via email.   I received nothing and checked junk mail folders.   I emailed for follow-up on my own and was told I would be contacted by a specialist. 
Specialist called and wanted to give me the hard sell on how they really wanted to stop by when my wife would be home.   I work in high-tech sales so I understand why they want to do this.  However, it's a huge red flag to me and exposes how they conduct their business, which is not how I conduct business. 
 

"
Recommended by81%of homeowners
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northshore pressure washing
New to Angi
Energy Audit - For BusinessHome Energy Audit

Serving Marshall, IL and surrounding areas

In business since 2011

Free estimates

We are one of the largest energy consulting companies in the country. We offer Free Energy Forcasts to businesses across a wide variety of climate zones. When implemented, our recommendations can consistently save you 17-22% on your energy costs, in the first year. We offer a variety of products, from an all-inclusive fixed product, to a variable option and a hybrid. Call today to see what solutions we can offer you! References are available from very happy clients.

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Energy Efficiency Auditing FAQs, answered by experts

Window AC units use a fair amount of electricity, but significantly less than central AC systems. Because they are more energy-efficient for cooling individual rooms or small spaces, their usage is comparatively low. On average, a window AC unit consumes between 500 and 1,400 watts, while a central AC system uses over 3,500 watts—meaning a window unit uses about one-third of the energy. This typically translates to a monthly running cost of $15 to $40, although this can vary depending on external factors.

While many states require all new construction to undergo blower door tests, it’s not a requirement for existing homes. But in both cases, a blower test helps confirm that the contractor has sealed the exterior, that the type of ductwork installed is functioning properly, and that your home is as efficient as possible.

Yes, a dirty air filter can cause a higher electric bill. That’s because clogged filters make it harder for air to flow through your HVAC system, which forces it to work harder and use more energy. According to the U.S. Department of Energy, replacing dirty filters can save you between 5% and 15% in utility costs.

Yes, mini-split or ductless AC systems add value to a home and do not devalue it. They are an attractive feature for potential buyers, especially in older homes without existing ductwork, as they provide a practical air conditioning solution without the significant expense and hassle of installing traditional ducts. Ductless systems also eliminate issues associated with conventional ductwork, such as noise and the potential for pests. Furthermore, homeowners value energy-efficient solutions, and mini-splits offer high efficiency for both heating and cooling, plus zoned temperature control. This leads to lower energy consumption and reduced electric bills, which is a major selling point.

Keep the unit full but not overloaded, ensure door seals are tight, set correct temperatures, and avoid frequent door openings. Position the appliance away from heat sources for optimal performance.

The Marshall, IL homeowners’ guide to energy efficiency auditing services

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

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