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How Insulation Prevents Heat Transfer

Insulation slows the movement of heat.

Learn how insulation works to slow the movement of hot air. Discover how insulation can help stop three different types of heat transfer: conduction, convection and radiation.


Types of Heat Transfer

Uninsulated Wall Diagram

There are three methods for heat transfer: conduction, convection and radiation. Knowing what each type is and how it works will give you a better understanding of how insulation and weatherstripping systems protect your conditioned space.


Conduction
Insulated Wall Diagram

Conduction is the transfer of heat through solid objects.

  • Example: When it's cold outside, uninsulated walls and windows become cooler on the inside.
  • Result: More energy is required to replace the heat lost warming the inside of the walls and windows.
  • Preventive Measures: Insulation (fiberglass batts / rolls or blown cellulose), low-e insulated windows, storm windows and storm doors slow the migration of heat energy and help maintain the temperature in the conditioned space. Slowing the energy transfer saves on the amount of energy needed to maintain the conditioned space.


Convection
Caulking to Prevent Convection

Convection is the transfer of heat through liquids or gases.

  • Example: When cold air enters your home, it mixes with warm air. Heat energy is transferred to the cooler air, and the overall temperature of the room is lowered.
  • Result: More energy is required to replace the heat transferred to the cooler air.
  • Preventive Measures: Weatherstripping, house wrap, caulk and expanding foam greatly reduce the uncontrolled flow of air into or out of your home. Reducing the uncontrolled flow of air into or out of the home reduces the amount of energy needed to heat unconditioned air.


Radiation
Blinds to Prevent Radiation

Radiation is the transfer of heat through space in the form of electromagnetic energy.

  • Example: When sunlight enters an air-conditioned room through a single pane window, heat energy is generated in the room.
  • Result: The air conditioning system must run longer and work harder to overcome the heat gained through the window.
  • Preventive Measures: Low-e insulated windows, blinds and awnings all lessen the heat gained by sunlight entering through windows.



Insulate and Save Energy

In cold or hot climates, a well-insulated and weatherstripped home is more energy-efficient and costs less to heat or cool. Most of the preventive measures listed here are simple fixes that you can do yourself. For a small investment of time and money, you can see a large reduction in the amount of energy required to heat and cool your home. Along with the reduction in energy use, your monthly energy bill should be lower, saving your hard-earned cash for other things.

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