Residential heliostats. We have two. Natural light is awesome.
Multisplit air heat pumps. After adding insulation and reducing air leaks, the new
heating system as 4 zones. We can heat the whole place on the coldest day
with about 48 kilowatts of heat, which is less than the flue loss on our old
Attic trapdoor tent, to reduce one source of air leaks. I feel like camping any
time I have to unzip and enter the attic.
Serious gutters. I really wish we had aluminum instead of the rusty steel, but
more importantly for us are the hardcore micromesh guards that finally, finally,
finally will keep out the needles.
I'm also loving the new 10 year battery only smoke detectors. Anything that cuts
down maintenance is a win.