There are two types of heat pumps found in Alaska:
Air source heat pumps take heat from the ambient air and use electricity to “step it up” to a temperature usable for space heating. ASHPs work best in more mild climates like Southeast Alaska, though colder-climate models are being developed now.
Ground source heat pumps use a similar technology except they take heat from the ground rather than the air. GSHPs are most efficient in warmer ground but have proven to work even in cold climates like Interior Alaska.