1) Good insulation means you can use a smaller (cheaper) heat pump. Or it doesn't need to work hard most of the time & is therefore likely to last longer. 2) H

1) Good insulation means you can use a smaller (cheaper) heat pump. Or it doesn't need to work hard most of the time & is therefore likely to last longer. 2) Having that heat pump removes the need for a natural gas hookup - and fixed-rate monthly cost that comes with it regardless how much gas is used.