One of my places had a little extra room next to the kitchen so we made a dedicated coffee area with a coffeepot, a drip setup, a french press and a pod machine.

MAYBE, if you live in the town, and are VERY handy, and open an appliance, hvac, roofing company and are willing to travel to the 30 closest cities (since you won’t be profitable even if you get all the business in a city that size.) then maybe you’d do ok.

I'm concerned that the combined load of heat pumps and ancillary heat strips, along with other appliances, might exceed the 100-amp capacity during winter.As part of our future plans to add a third unit and separate the utilities, we intend to install two additional meters: one for common areas and one for the new unit.

It is pretty pricey IMHO for some but worth it as a luxury kitchen item.$349 - Breville the Infuser Espresso Machine - https://www.amazon.com/dp/B0089SSOR6Now this is a semi pro level espresso machine.

You don’t think you can charge $2/day more with appliances?

Focus mainly on kitchen and bath remodeling for biggest bang for the buck return on appraisal value and appeal for buyers. 

While many appliances and the A/C, water heater, etc were updated they didn't update plumbing or wiring.

Until you spend 20k on paint and some new kitchen appliances, but the roof and foundation are still shot and the 100k ARV is more like 70k in reality.

Kitchen?

. - New windows, AC ducts, attic insulation, gutters, appliances, fans & lighting, paint, and tile.