Review on HVAC-Calc by Jay Kenville

The interface of this program was easy enough for me as an individual who had no previous knowledge about heating systems or design, I learned quickly that it's not just another software but one designed specifically with professionals in mind! There are so many benefits including being able to predict energy savings by calculating various scenarios such as increasing insulation levels after installing windows (among other things). This tool allows you calculate your expected annual fuel consumption vs actual usage - showing if there will be any differences between each scenario which can help make better decisions regarding efficiency improvements/upgrades.