It's very easy for people who have little background in mathematics (math) or formulas, etc., it allows you quickly make your own tables of math equations needed when calculating supehrt & subsiquent charging using different mass flow rates as well as ambient temp / outside air temps where applicable.
I wish there was an easier way that would provide more detailed graphs showing how much gas we actually use per day versus just having two lines only - one being the total usage over time which can get pretty difficult depending upon what kind of system(s), whether split-system type heat pump OR tankless water heater units are used along wth other systems such as boilers, room AC thermostats AND COOLING TANKS all at once! The program works like magic if anyone has never done their simple basic subtraction formula before this will be fairly interesting, but definitely not impossible by any means. It's very easy for me as an engineer I just input my parameters, add them up then click calculate! There are many different variables that you can select such us air flow rate or heat load etc so it gives more options than any other product in this price range of $50-200!! If there was anything better out their at least similar but cheaper they would be competing against themselves which means less money being distributed into advertising budgets instead going towards research & development costs.