A jacket for the water heater isn't a bad idea; I always forget about that option. Ditto the duct sealing; I'd done it in my old place, I'm sure I have at least half a roll of foil tape around here somewhere.
Windy days aren't a problem per se. Local data says we average 5.78m/s winds near roof level... that'll be this weekend's chore. I have a couple night shifts to attend to first
I know the porch is a major problem; there are some major leaks in there I should be able to seal.
Charlie