Is your home in need of air conditioning or heater replacement, but you're not sure who to call? There are so many choices, but one company stands out. Ray N. Welter Heating Company, in Minneapolis, MN, has been proudly supporting the Twin Cities and the surrounding areas for over 100 years. You can rely on our award-winning, family-owned business that has served Minneapolis and St. Paul for four generations. Since then, we have installed over 90,000 units.. Humidifiers, Humidifiers