What Trane says about us

  • Provides valuable “energy information” that is critical to the long-term financial success of the Trane-GHA Energy Performance Contract
  • Fast, low cost installation and much more economical than installing individual gas meters for each unit
  • Supports long-term trend analysis and provides data that can be used to assess relative efficiency of gas furnaces
  • Reduces cost of measurement & verification (M&V) required by HUD on performance contracts by allowing measurement at the source in lieu of “whole building metering” analysis


Energy Metering Systems, Inc. (EMS) has been developing sub-metering equipment and providing comprehensive utility metering solutions to the multi-family residential industry since 1981. EMS has over 1 million meters installed throughout the United States. EMS expanded  their product line in 2011 to add Comfort Monitor Systems. The temperature control and monitoring systems offer an innovative way of reducing energy use without sub-metering.


Established in 1981, Roger Freischlag, President of Energy Metering Systems, Inc. an engineer, an innovator to conservation products for the multi-family, has led his company and team for 30 plus years. He has been recognized as one of the early pioneers in utility sub-metering and heat allocation systems. Roger developed and grew Energy Billing Systems, Inc., one of the top utility billing providers for multi-family and sold the billing operations to a leading property management software developer in 2009. Energy Metering Systems, Inc. continued designing and developing hardware for sub-metering, heat allocation and energy conservation systems for the multi-family sector.

EMS and team are excited about the Comfort Monitor Systems which recently released to the marketplace. Clients are boasting about the valuable “energy information” that the Comfort Monitor systems are providing. A truly innovative way of reducing energy use which is critical to modify resident behaviors, determine energy upgrades, and promote energy conservation. EMS is looking forward to being the next pioneer in thermostat designs for the multi-family industry.


Our competitive advantage is that we have been in business for 30 plus years. Our systems have been used longer and are more widely used than any other systems within the multi-family industry.  We understand sub-metering more than any other because we design, manufacture, install, service, and support a complete line of electric, gas, and heat allocation systems. We are the experts, we understand the term "you can't improve what you don't measure".



Since our inception, the EMS team of engineers has developed a wide variety of products. One area that we have specialized in is building devices that accurately and reliably measure central hydronic heating and cooling systems. By continually testing, modifying, and improving our meter designs, today's Gas Allocation System (G.A.S.) devices have evolved into the most versatile, accurate, high quality devices available on the market.

Our technical team is the most knowledgeable in the utility sub-metering industry. Our staff members offer extensive expertise in all areas of the business and are available to assist from site survey, thru installation, to billing set-up consultation.



Because of our technical expertise, in 1994 we were invited to participate in the development the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) Guideline 8-1994. This document is the definitive guide for Energy Cost Allocation for Multiple-Occupancy Residential Buildings.


Energy cost allocation (ECA) systems are combinations of monitoring devices and accounting procedures designed to allow the energy costs in master-metered multiple occupancy residential buildings to be apportioned among the individual units on the basis of use.


Our electric watt hour meters are ANSI certified. ANSI certification guarantees utility grade accuracy and reliability.