I'm still fighting with an issue, but am looking for a long term resolution.
In a double (we will be living in both upper and lower) how would you assign one 75K BTU and one 50K BTU furnace? It was 50k on bottom, 75K on top, but I'm thinking that we will not be heating the top all the time, mostly on weekends. It will only need to get to 68F. The 75K seems better suited for the bottom given poor insulation. It's about 1000 sq ft each, gas with hot air.