Developer's DescriptionBy Townsquare Interactive MobileFounded in 2016, Northern Integrity provides 24-hour HVAC services to residents in Velva, North Dakota and the surrounding areas.Founded in 2016, Northern Integrity provides 24-hour HVAC services to residents in Velva, North Dakota and the surrounding areas. We rely on Armstrong Air HVAC units due to their proven durability and energy efficiency. Download our app to request a service, upload photos, and more.