• Sign up for an Energy Audit with GreenMark Home Performance to increase home comfort & health!
    Is your home too hot & humid?
    An energy audit is the first step to increased home comfort and health!
  • GreenMark Home Performance's Whole-House Approach will optimize home comfort and performance
    Keep your home cool and comfortable!
    GreenMark's whole-house approach will ensure your home always feels like home.
  • Have peace of mind knowing that GreenMark Home Performance backs all work with a 100% customer satisfaction guarantee
    Our work comes with a 100% satisfaction guarantee
    So you can have peace of mind knowing that the job will always be done right.

Home comfort, efficiency & health starts with an energy audit.

Get yours today!

MO: 314-845-9144 | IL: 618-394-4229

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Home Energy Efficiency & Comfort Experts

If you want to make your home more comfortable, energy efficient, and healthy then you've come to the right place. Greenmark Home Performance has been helping homeowners in the St. Louis, MO and Metro East Illinois area for years.


Our whole-home services start with a thorough energy audit that will uncover what's causing problems with discomfort, inefficiency, and poor indoor air quality in your home. Then, we'll determine the best solution that's tailored to your home so that we can make it comfortable, healthier, and lower your energy bills for good. Typically, homeowners in our area need help with insulation, air sealing, exterior home improvements, heating and cooling system installation, as well as ventilation.


Ready to make your home more comfortable, affordable, and healthier? Contact us today to get started!

Our Services

What Our Customers Are Saying

  • "I want to give a shoutout to Mark Inman of Greenmark Home Performance. Mark recently helped us through some energy efficiency and aesthetic improvements to our 40-year old house.

    Larry Stout, Waterloo, IL 62298
  • "This past summer GreenMark upgraded our home for energy savings. We have 2 HVAC units, one for each floor. During the summer, we normally set the upstairs to 80 degrees during the day and the AC turns on about noon time.

    Larry McCord, St. Louis, MO 63129
  • "Mark Inman knows what he's doing. Before the work was done on our house, on a warm/hot day the 2nd floor was uncomfortably hot, the ground floor was cold and the basement was freezing.

    John Devon, Chesterfield, MO 63017
  • "I was very satisified with Greenmark Home Performance. They came out and air sealed my attic, added insulation, added ventilation and I had my crawlspace encapsulated. I am very happy with all the work that was done! My home is more comfortable and I have noticed the savings in energy!

    Dan G., O Fallon, IL 62269
  • "I was very satisified with Greenmark Home Performance. They came out and air sealed my attic, added insulation, added ventilation and I had my crawlspace encapsulated. I am very happy with all the work that was done! My home is more comfortable and I have noticed the savings in energy!

    Bev J, O Fallon, IL 62269
  • "Mark came out to give us an estimate to encapsulate our crawl space area. He was very knowledgeable about the problems and explained the possible solutions."

    Kathy & Mark T, Edwardsville, IL 62025
  • "We had Greenmark Home Performance come out for a door. We were very satisfied with the company and the product. If we had any questions or concerns, Mark was quick to respond and answered them promptly.

    Gary C , Mascoutah, IL 62258
  • "We had the representative come out for an Energy Assessment. We found that he was very informative, professional and not high pressure. He explained in great detail about the program and helped us with any questions or concerns that we may have had.

    John W. , Belleville, IL 62223
  • "We were very happy with Greenmark Home Performance. The door was exactly what we were looking for. We really liked how Mark did exactly what he said he would do without trying to sell us something we didn't need. He was very professional and courteous.

    Gary , Mascoutah, IL 62258
  • We were unaware of what was involved in an energy audit and your audior took the time to explain everything. We were impressed with the report which told us the areas in which we need to take action on.

    Cynthia Simpson, Saint Louis, MO 63122