According to Sheila, none of the units appear to be malfunctioning currently. After lengthy discussions over all of our previous trips for heating concerns, it seems like the majority of concerns are stemming from confusion regarding how to operate the systems. I.e. operating the remote controls and not turning the temperature down when the room is not in use. By turning the units off or down, the room will get cold at which point the heat pump has very little chance of warming the space back up to desired temperature in a timely manner. Heat pumps do not have the ability to warm up a cold room the way a gas furnace can. In cold weather, it is important to leave the temperature setting seemingly 'too high' (80⁰+) to keep the unit ramped up. The temperature sensor that drives system operation is inside the top of the indoor unit. A setting of 70⁰ will not allow for the entire room to reach desired temperature. The unit senses 70⁰ air around itself but cannot account for the en