I will put a plug in for Royalton Heating and Air in Brooklyn Park. They helped my family out of a furnace fire sitaution about 25 years ago so when I upgraded a few years ago they got a call. Prices were very fair compared to other estimates and they were honest about what my house could handle. Instead of simply selling the highest efficiency they told me I wouldn’t see a nickle savings over a moderate unit because of the small ducts in the older house.