Match the pipe to the pressure
A super efficient heat pump with a GWP of 1
You can dig in to the roof without adding more insulation, but you can't dig far
Be economical, direct, and don't get kinky.
But some buckets are more relative
New energy codes are coming (very) soon; many states are jumping straight to the most aggressive one
In a tight, energy efficient house, the HVAC system can make or break you
All clothes dryers should vent directly outside.
You can control the bath fan and the light from the switch, automate with motion and sensor controls, or you can mix and match methods. You can even tinker at the switch