This fall I added attic insulation up to a R50 (I live in Minnesota - so its cold up here). My windows have been refurbished as well, so they are pretty solid. Now, however, when the thermostat on the first floor is keeping that level at a comfortable 67 degrees, the second floor is quite a bit warmer - as much as ten degrees. What are my options - do I need to put in zones in my hot water system - is that expensive? Should I run the fan on my central air system - even though the sound of the fan takes away the peace and quiet of the boiler system? The heat is going up the open stairway - can I find a location for a ceiling fan that will keep the heat circulating on the first floor instead of going up the stairs? Thanks for any ideas.