Last night, we had no heat on the second floor of our house, so we all slept bundled in extra blankets.. Andy was checking things out last night and found a mud dauber's nest blocking some of the piping and fan housing. He didn't get it working last night, but the heat is on this morning. After an early trip to the attic, he found and cleared some mud from another hose in the furnace that he didn't check last night. Thankful for a warm house this morning. Blessings.