We were a little worried when there were some issues with getting the unit and thermostat to talk to each other, but they got those worked out and got the heat back on by about 5:30PM. That night the temperature did drop to 7 degrees, as predicted, then just kept dropping to 2-3 degrees the next afternoon, before rising to 6, then dropping back down to 4 degrees the next night. But we were toasty inside.