Building shell improvements are one of the first places you should focus on when upgrading your existing facility. Start with the low cost/no cost opportunities. Like the lighting system, these factors are key to properly sizing the heating and cooling system during new construction or major upgrades.
These elements of the building are a major investment that should be purchased on a "life-cycle costing" or return-on-investment basis, rather than lowest initial cost. Over the life of the building, the operating savings in energy alone will far outweigh the initial cost of these items. Plus, in the case of new construction, it will be less costly to "do it right the first time," than to make even more costly upgrades to insulation, windows, walls or roofing material later.
The sections below will help you learn how to make your facility more energy efficient through improvements to your building shell. For additional information that may be applicable to your small commercial facility please visit ENERGY STAR Home Sealing.