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
Remove And Replace Old Attic Insulation; Install Attic Venting System, Including Dura Vent Attic Ventilation Channels Between The Rafters To Maintain Airlow From Eaves Into Attic; Install And Seal Can Lights, Bathroom Extractor Fans; Vent Exhaust Fans Thr in Chesterfield, MO
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. Yesterday (July 9, 2017) the high was 97 degrees and the house was comfortable throughout (with A/C on) with ...
Energy Audit in Saint Louis, MO

Energy Audit Performed in St. Louis MO