I'm not sure it's doing the right thing when I entered a multi-zone mini-split.<p>It's acting like I'm buying a separate A/C for each zone, but that's not how they are priced. I have 9 for "Heat pump: Number of units", and 2 for "AC equipment: Number of units ".<p>Also it's having trouble doing the math right because I have window A/C, but I would get a mini-split for A/C and Cooling.<p>For me the math is just not right - if I put in a mini-split to have A/C, I need to decide what's cheaper, running my high efficiency boiler (that I already have), vs heating using the heat pump.<p>That's really all I want to know: What costs less, heat with gas, or heat with electricity. Or maybe a hybrid.<p>This seems geared more to people who have existing ducted A/C with a furnace (not a boiler), who might get rid of the boiler part, and leave the rest. (Or just not use the boiler.)<p>IMO you should just stick to calculate fuel costs for heat with gas, vs heat with electricity, and leave out the installation costs.