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We have an Excel spreadsheet that contains the equations we use with customer inputs to complete a product selection. However, to effectively complete the selection we need to imbedd a dll product which we have that will gather weather data we need to itterate the installed length for our customers for the location of the job being designed. In addition this weather data is used to calculate operating savings based on hours at a particular temperature. All the calculations are in place just need to link the dll and clean up inputs and outputs and compete this itteration routine (not sure how to do that). Coiuld be completed in Excel or VB. Would prefer to work with a local supplier in Denver, CO metro area. Some Engineering knowledge would be helpful.