How do Inuits heat igloos?

Inuits heat igloos primarily using small oil lamps called qulliq, which burn seal or whale blubber, providing both light and warmth. The igloo's design, with its thick snow walls, helps insulate and retain heat, allowing the interior temperature to rise significantly above the outside environment. Additionally, the body heat from occupants contributes to warming the space. The combination of these methods creates a surprisingly comfortable living environment despite the frigid temperatures outside.