The following calculators are listed based on complexity and the amount of information required to provide saving estimates (least complex first):
Garland Greenhouse products incorporate one or more of the following characteristics:
ENERGY STAR’s® Roof Comparison Calculator estimates annual energy savings for typical building types with non-metallic-surfaced roofs using typical weather conditions. These estimates are derived based on simulations run with the DOE-2.1E model using cooling and heating degree-days.
The DOE's Cool Roof Calculator was developed by the U.S. Department of Energy's Oak Ridge National Laboratory. The calculations require more input data and there are 243 different locations built into the pull-down lists in the calculator; 235 for the US, Pacific territories and Puerto Rico; and 8 Canadian cities. There are two calculators based on building the following facility size:
- For large facilities (Version 2.0):
- For small and medium-sized facilities (Version 1.2):
In addition to the above energy calculators, many trade associations like the National Roofing Contractors Association (NRCA) have their own calculator to help in the specification and design of an energy efficient roofing system.
*ENERGY STAR® is a registered trademark of the U.S. government. The ENERGY STAR Program represents a voluntary partnership between businesses and organizations and the federal government to promote energy efficiency and environmental activities.