 Charlie Ugstead for Ugstead Plumbing and Heating of Fergus Falls. Let Carrier provide the ultimate in-home comfort. The new Carrier Infinity system delivers premium heating and cooling performance, occupancy-based temperature control and zoning capabilities, innovative filtration for healthy air, and over-the-air software updates that help optimize performance. Visit Ugstead Plumbing and Heating of Fergus Falls. Carrier, turn to the experts. Ugstead Plumbing, Heating, and Air Conditioning. Total comfort for your home.