tulip-
You might be happier with the front loaders, stacked. They're more efficient than the usual stacked units (not sure if that's what you're looking at or not), and you can't do 2 sheets in the regular stacked ones at once.
On the furnace - I'd talk to an HVAC contractor. Since you already have an air handler for the furnace, you may just be able to put in an AC unit. I would not use window units - inefficient, and generally a security risk.
Our friends who just re-did their kitchen wish they had gone with butcher block countertops. Natural oil is all that's required. They did a cork floor that's really cool. They also did an induction cook top - and love it so far.
Consider re-insulating the attic and (if appropriate) above the basement. Have an energy audit done - you'll learn a lot!
Congrats on the house!!
CA
Most days in life don't stand out, But life's about those days that will...