Green Is Good!! Green Terminology 101.....

Real Estate Agent with Texas Country Properties

Have you ever wondered about all the lingo that is associated with Green Homes and Energy Efficiency? Well, let me clear up a few things and give you a reference as to what different things mean.

  • ACH- Air Changes per Hour- This is part of the Energy Star & Diamond Level testing to determine how much air leaks through the walls and ceilings (Hint: A lower number, the more efficient)
  • AFUE- Annual Fuel Utilization Efficiency. A furnace's heating efficiency. Measures the heat delivered vs. the fuel used. Measures in percentages. The higher number is better.
  • ASHRAE-American Society of Heating, Refrigerating and Air-Conditioning Engineers. This is the primary organization used in the United States for the design standards in our HVAC systems.

  • ENERGY STAR-A joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helping us all save money and protect the environment through energy efficient products and practices.

  • FRESH AIR SYSTEM-An electronic system connected to the HVAC system that brings in filtered outside air on a timed basis.

  • HVAC-Heating, Ventilation and Air Conditioning. HVAC includes the furnace, air conditioning components, fan and ductwork installed in a home.

  • IAQ-Indoor Air Quality. IAQ is the quality of the air breathed by occupants of an indoor or enclosed environment.

  • IRC- International Residential Code. First published in 2000, the IRC is the Building Code for the State of Texas.

  • JUMP DUCT- A flexible, short, u-shaped duct that connects a room to a common space as a pressure balancing mechanism.

  • LOW E2- Low emissivity. Glass is coated with a metallic oxide layer that improves thermal performance. The primary function is to reduce heat gain in the summer and heat loss in the winter.

  • MANUAL J- The ASHRAE method for calculating residential home cooling loads and the sizing of the system.

  • MERV-Minimum Efficiency Reporting Value. The ASHRAE standard for filter efficiency. Higher rating is better.

  • RADIANT BARRIER- Low emissivity attic decking under shingled roofs that reduces summer heat gain, reduces cooling energy usage.

  • R-410a- Environmentally-friendly refrigerant used in our HVAC systems.

  • R-VALUE- Resistance - Value. The resistance a material has to heat flow. The higher the R-Value, the greater the resistance.

  • SEER- Seasonal Energy Efficiency Rating. It measures the efficiency of the air conditioner once it is up and running. Higher number is better.

  • SHGC- Solar Heat Gain Co-efficient. The solar radiation entering a home through the windows. The lower the number, the better the window is at blocking heat gain.

  • U-VALUE- A measure of heat transmission due to the air temperature difference from inside to outside. The lower the U-value, the better.

I hope you find this useful!!! If you have any questions, please feel free to contact me!!

Posted by

Shelby Kyle-REALTOR

direct: 281-224-6299

RE/MAX Realty West

Fulshear, Texas


Comments (2)

Chris Minion
O'Brien Realty - Lexington Park, MD

Hi Shelby,

Green is Good!  Thank you for sharing the terminology associated with Green Home & Energy Efficiency.  Very helpful information.  Have a great weekend.



Oct 16, 2009 11:47 AM
Shelby Kyle
Texas Country Properties - Fulshear, TX


You are certainly welcome! Look for more helpful information coming soon!

Oct 18, 2009 02:35 PM