It turned out there were aluminum wires so we upgraded the electrical service, removed all of the walls so we could rewire the house (4 bed 2 bath).

We have no interest to get a new junk of this same company but like to hear some feedback from investor follows and electric engineer.Do you think the motor be changed to a non-change speed will resolve the issue?

Also remember it will take time to get them done, during which the home is vacant and not on the market.People shop with their eyes-so many don't care about stuff that is really important (plumbing, electrical, roof, etc). 

Wildfire risk is also nearly non-existent close to the coast, and haven't yet heard of hurricanes or tornadoes, but you will notice a tsunami sign or two..Electricity, water and general operating costs are surprisingly 'affordable.'

I put in some new flooring and paint, minor electrical, and a couple of ceiling fans (approx 20k in repairs, appliances, travel, and holding)I put in a new refrigerator, washer and dryer, and leased it myself to a family a few months later (6 months lease) through an insurance company because of their home being a total loss.

New mechanicals (HVAC, electric, plumbing), kitchen, bathroom, adding a 1/2 bath in basement or 1st floor, new drywall, floors, paint, etc.

The problem that I'm thinking that we will run into is that water and electric will be difficult or impossible to have routed out there.

The most pressing, and i cant seem to find a true answer from the the building department OR the utility companies is if I need to have separate meters (Electrical, gas, water) for my ADU and main home. 

However, one recent sale in the area was 109K for a .15 acre lot, however, it was verified developable and had gas, electric, and water at the street.

STR cleaners generally set rates that average out, meaning the big stays that mess up the whole house are offset by the one offs that use one room and the bathroom and never touch the stove or refrigerator.