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TRUSTED BY O FALLON, MO HOMEOWNERS

  • Average homeowner rating star icon4.8
    Average homeowner rating
  • Verified reviews icon69
    Verified energy efficiency auditing services reviews

Top-Rated Energy efficiency auditors in O Fallon - Updated Nov 2026

Avatar for St Louis Insulation
St Louis Insulation
4.9(
67
)
Energy Audit - For BusinessHome Energy Audit

Serving O Fallon, MO and surrounding areas

In business since 2001

Free estimates

Credit card accepted

"I was totally satisfied with this Company from the beginning to the end. I scheduled an appointment and was seen right away. A representative came to my home and assessed what I needed to have done. The price was reasonable and the work was completed in a timely fashion. I would recommend this Company in a HEARTBEAT!! Thanks for ALL that you DO!!"
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+40

Recommended by98%of homeowners
Avatar for Foam Engineers
Foam Engineers
4.8(
229
)
Home Energy Audit

Serving O Fallon, MO and surrounding areas

In business since 1988

Free estimates

Credit card accepted

"Fantastic experience with Paul, Mindy and their team when they helped us insulate the attic spaces surrounding and above our 1.5 story house. We have immediately seen the benefit from the insulation through our energy consumption, reducing the run-time of our unit by ~4 hours a day on like-weather days. This team will take care of your exact needs by tailoring their solutions to your specific situation and they don't cut any corners in ensuring your getting the value deserved!"
Top Plates/ Wiring
Top Plate / wiring
Sealed Duct Work
Sealed Duct Work
Sealed Duct Work

+17

Response time9 hrs
Recommended by98%of homeowners
Peterson Energy Consultants
3.9(
67
)
Energy Audit - For BusinessHome Energy Audit

Serving O Fallon, MO and surrounding areas

In business since 1978

"After purchasing a Deal for a home energy audit, Paul Peterson and his wife came on the scheduled day and checked the house for air loss to the outside.  They sealed the front door with a plastic 'door' with an exhaust fan to pull in cooler outside air.  They then took pictures with a camera that showed cold/hot  areas.After inspecting attic and basement he made several suggestions as well as promising to send an estimate of work.  After I received that I eliminated some work that could be done by family and agreed to the rest.  A date was set and the workers came promptly on that day.
There were 4 workers and each of them was courteous, friendly and competent.  Work was explained and I was kept informed of
everything that was done.  They were dog friendly and cautious about closing gates while working.
At the end of the job Paul mentioned one thing that he had not bid but that needed to be done to bring everything up to code.  He said he would have his crew come by and take care of it at no cost when they were in the area.  This was done a week or so later.  I have confidence that this is an honorable company that stands behind their work and word.
"
Recommended by80%of homeowners
Avatar for Gant Heating and Cooling
Gant Heating and Cooling
5.0(
10
)
Energy Audit - For BusinessHome Energy Audit

Serving O Fallon, MO and surrounding areas

In business since 2006

Free estimates

Emergency services offered

At Gant Heating and Cooling we are the top rated Heating and AC provider in the St. Louis area. With over 20 years of experience no job is too complex for us. We cover all residential and commercial repairs, replacements, and new construction jobs. We are experts at solving problems and helping our customers find the most cost effective way to fix their problem. Call us today for your free estimate! Repair and service HVAC equipment

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+1

Recommended by100%of homeowners
Avatar for American Society of Heating & Cooling Specialists
American Society of Heating & Cooling Specialists
5.0(
1
)
Energy Audit - For BusinessHome Energy Audit

Serving O Fallon, MO and surrounding areas

In business since 1995

Emergency services offered

Credit card accepted

HVAC Technicians At Your Service Since 1991; As a fully licensed, bonded and insured air conditioning, heating and ventilation company, American Society of Heating and Cooling Specialists provides residential and commercial maintenance, installation and repair services on all major brands of heating, air conditioning and restaurant equipment to customers throughout St. Louis, St. Charles, and the surrounding areas.

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Recommended by100%of homeowners
Avatar for Happy Roof
Happy Roof
3.3(
22
)
Energy Audit - For BusinessHome Energy Audit

Serving O Fallon, MO and surrounding areas

In business since 2015

Free estimates

Emergency services offered

Happy Roof is a locally owned company who specialize exterior improvements. Located in St. Charles, MO, we serve the entire metro area. We use only the highest quality material and trained professional craftsman. \n \nWhen interacting with Happy Roof, you will notice that we are particularly focused on the principles of quality workmanship, timely completion, competitive pricing, and integrity in all our business dealings. We combine knowledge and research, with our extensive practical experience, to ensure a specialized approach for your project. \n \nContact us today for a fair and accurate estimate of your project. We look forward to adding you to our long and growing, list of happy customers.

Slate Replica
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Spanish Clay
Slate title profile

+46

Response time2 days
Recommended by71%of homeowners
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Energy Efficiency Auditing FAQs, answered by experts

If your AC runs constantly, it could be due to a number of things, including a faulty thermostat, incorrect temperature settings, or broken equipment. Alternatively, you might have an airflow problem (for example, blocked vents or leaky ductwork). Either way, an HVAC pro can identify the specific problem and fix it for you.

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

You can save money on heating oil through a combination of improving home efficiency and smart purchasing strategies.

Home Efficiency and Usage:

  • Improve Insulation: Ensure your home, especially the basement and attic, is well-insulated and sealed against drafts to prevent heat leakage.

  • Manage Your Thermostat: Use a properly calibrated and programmable thermostat. Lower the temperature by a few degrees, particularly when you are away from home or asleep.

Purchasing Strategies:

  • Buy in the Off-Season: Order heating oil during the summer months when prices are generally at their lowest. This strategy is most effective if you have a large primary tank or a separate storage tank to accommodate bulk deliveries.

  • Consider a Delivery Contract: Some companies offer contracts with a set price for the term. This can lead to savings if market prices for oil increase, but you might pay more if prices drop.

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.

Setting your AC unit to 78 degrees can, indeed, help you save energy. In fact, according to experts, every degree you turn the unit up could save you between 1% and 3% on your energy bills. That said, turning your unit off entirely while you’re out might actually be less efficient than keeping it on at a higher temperature. Why? The unit will need to work extra hard to cool the house back off again after all those hot hours. 

The O Fallon, MO homeowners’ guide to energy efficiency auditing services

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