Simple question really, or maybe not?

I live in northern North Dakota. Typical heating season for me is Oct 1 to April 31 with useability of a heat pump being all of Oct and part of March and all of April typically from what I have been able to figure.
Im looking at having central air installed and all the contractors I have gotten bids from have also given the option of a heat pump for about a 20% price increase. Should i consider it? If you need any further info please let me know. Im just unsure what to do.