Updated: Mar 20
If your designer is still using his HP 21S from high school and geeks out on IR photos, manual j-calculations and blower-door tests, then maybe your envelope will not be heating and cooling the hillside.
Get an energy assessment, do a blower door test, size your system properly and repeat. Commission all systems and reduce your consumption.
If you think single pane windows and plastic wrap beat low-e glazing and thermally broken aluminum windows- let us bet a chocolate bar my double-panes will beat your saran wrap. As added bonus try opening saran wrap on a bluebird winter day.
a normal home has an ach of .3.
a home with single pane windows and sieves for storm doors has an ach of 1
do you really want to heat and cool the great outdoors/city?