My Aunt just had 5 split unit Fujitsu air conditioners/heat pumps installed in her 1 floor ranch house. She decided to go with this model because the heat pump can go down to 0 degrees. She is excited about the energy savings using the heatpumps vs. the cost of using the Oil Fired Boiler all winter; which although she loves the "wrap around warmth" it creates throughtout the house, it is very expensive. She currently has a boiler that provides the domestic hot water and heats the cast iron baseboards that go throughout the main living floor. So the boiler would still be running for water a few times a day providing some heat for the basement. Her concern is that she will forget to turn up the thermostat on the main heat on those days/nights where the basement will need heat to keep the pipes from freezing. She does have a garage on one side of the basement, so it gets colder over there. Would having the programable thermostat run above the split unit settings for about a half hour 4 times a day be enough? Is it possible to add a second thermostat to the basement that would over-ride the main floor thermostat? You thoughts and suggestions will be helpful.