I just discovered about a half an hour ago that our home is not heating. Our home is not quite 5 years old (about 2200 sq. ft.) w/a single furnace for the entire home (Lennox Merit Series). I am scrambling because its below freezing out and we have two young daughters, so forgive me for not writing down the model # yet. I believe it's set for the heat pump to run above 35 degrees and gas to kick in below that. I checked the little window for the pilot and it's flashing green. Please help.