Let us help you ...make your home comfortable, affordable, and healthier.

Greenmark Home Performance - Home Insulation and Energy Experts

We make your home comfortable, affordable, and healthier!

Greenmark Home Performance has been providing thorough, quality home comfort assessments in St. Louis, MO and Metro East Illinois area for years. View our entire service area. We are certified as a Building Performance Institute, Building Analyst, and as an Envelope Professional. This means that we will be able to easily pinpoint areas of energy loss in your structure and provide proven solutions to ensure your comfort in your home.  Some of the main areas we focus on include:

Our Mission

Mark's mission is to make homeowners in St. Louis and Metro East comfortable in their homes using the "whole-home" approach, making homes more energy efficient, durable and healthier.

Meet The Owner

Mark Inman, Founder of Greenmark

Mark Inman has been providing comprehensive home evaluations for years now and knows precisely where to look in a building to discover where energy is being used, lost, and wasted. We have ideal solutions for all situations. He has teamed up with Department of Energy (DOE) Energy Star, Efficiency First, and local power distributors throughout the region.

Mark Inman is BPI Certified through the Building Performance Institute Envelope and Analyst certification #5036241. Because Home Energy Performance has evolved into a real business model, Mark Inman wants to lead this drive to more comfortable, efficient and, better quality homes.


Average rating for Greenmark Home Performance is 5 stars of 5 stars - based on 12 reviews
Remodeling And Increasing Energy Efficiency in Waterloo, IL
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. The changes made in the HVAC system and in added insulation and sealing have resulted in far lower energy bills and a ...
Replacement Doors in Mascoutah, IL
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. We really liked the fact when Mark came out, he did exactly what we asked him to do, didn't try ...