EGEE 102
Energy Conservation for Environmental Protection



Welcome to Lesson 8!

More than 90 million single-family, multi-family, and mobile-home households encompass the residential sector. Households use energy to cool and heat their homes, to heat water, and to operate many appliances such as refrigerators, stoves, televisions, and hot tubs.

Nearly half of the energy used at home is for space heating. Conventional space heating systems in the U.S. emit a billion tons of carbon dioxide (CO2) and about 12 % of the sulfur dioxide and nitrogen oxides. Reducing the use of conventional energy sources for heating is the single most effective way you can reduce global environmental problems.

Look at the graph below to see how energy is used in U.S. households.

How energy is used in U.S. Households
How Energy is Used Amount of Energy Used
Other Appliances and Lighting 23%
Refrigerators 5%
Water Heating 17%
Electric Air Conditioning 8%
Space Heating 47%
Data source: U.S. Department of Energy

The energy sources utilized by the residential sector include electricity, natural gas, fuel oil, kerosene, liquefied petroleum gas (propane), coal, wood, and other renewable sources such as solar energy.

Look at the graph below to see the primary fuel used by U.S. households.

Primary Fuel Used by U.S. Households
Primary Fuel Used by U.S. Households Amount of Fuel Used
Natural Gas 55%
Electricity 29%
LPG 5%
Other 0%
Fuel Oil 8%
Kerosene 1%
Wood 2%

Lesson 8 Objectives

Upon Completion of this lesson, students will be able to:

  • explain the operating principles of various types of heating systems;
  • list the main advantages and disadvantages of various heating systems;
  • explain the energy efficiencies of each of these heating systems; and
  • describe ways to improve the energy efficiency of the heating systems.

Checklist for Lesson 8

Here is your "to do" list for this week.

Lesson 8 Checklist
Step Activity Access / Directions
1 Read the online lesson Lesson 8a - Comparison of Home Heating Systems
Lesson 8b - Cooling and Heating
2 Review Lesson 8 - Review and Extra Resources (supplemental materials that are optional...but informative!).
3 Take

Lesson 8 - Quiz (graded). The quiz is available in Canvas.

See the Calendar tab in Canvas for due dates/times.


If you have any questions, please post them to the General Course Questions forum in located in the Discussions tab in Canvas. I will check that discussion forum daily to respond. While you are visiting the discussion board, feel free to post your own responses to questions posted by others - this way, you might help a classmate!