Hello All, I have been monitoring my system run time thru my ecobee thermostat for a while now. Over the last 3 days the temperature has been around the zero mark and I have noticed the following pattern: On Dec 11, the system operated in stage one for the entire day. See image on link below. https://drive.google.com/file/d/1lKZnTHZx5TEKhrG1eNd4rMKzHM0gS63A/view?usp=sharing On Dec 12, the system operates in stage one for most on the day then switches to stage one/two. https://drive.google.com/file/d/140QfxbK19kfxCK7BzL2Ku0DYxMcMEXxw/view?usp=sharing On Dec 13, the system now only operates in stage one and two for the day so far. https://drive.google.com/file/d/1CY9OLPAJDrZkabNNmfTXJUH-jB11al05/view?usp=sharing Since the temperature has stayed constant for the last three days, what would have cause this? Historically the system has rarely gone into stage two operation even with lower temperatures. Attached is my run time data from Nov 11 to Dec 12 Thank you for your reply.