Yes, our climate rarely drops below freezing, so the heatpump is a good fit. My house has little shade, so a/c in the summer is very nice.

I would have a separate unit for the basement and the first floor though; we do have zoning dampers, but it's not very effective and the basement gets too cold.

Propane deliveries are expensive, if starting from scratch, I might have wired for electric clothes drying and water heating. And I would have probably gone with owned tanks instead of the current system where the delivery company owns the tanks. Electricity prices doubled in the last 5 years, but propane may have gone up more.

seattle is basically the ideal location for a heatpump.