Add foam board insulation material from the soil surface down to a 12-18 inch depth around the perimeter of a greenhouse or high tunnel. This can save significant heat and keep the soil along the walls 10-20°F warmer. If the insulation is extended up to bench height, greater heat savings will result. For example, applying 2 inches of foam insulation to a 3-ft.-high kneewall or sidewall will save about 400 gals. of fuel oil or 550 therms of natural gas in a 28x100-ft. greenhouse over a heating season in northern climates. For more ideas on how to use insulation and save energy dollars go to the links below: Using Insulation To Save Energy and Money Introduction to Greenhouse Efficiency and Energy Conservation Contributors: Steven Newman, Colorado State University and John Bartok, University of Connecticut

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