If there is a really old brownstone factory or warehouse in your town, it’s almost a guarantee that its heated by a cast iron boiler. These old HVAC units were the tied and true standard for nearly a century, but the time has come to put them into retirement. While boilers are awesome, not all boilers are created equal. Cast iron boilers tend to still be found in these older buildings because believe it or not, they still work. But just because they’re still running doesn’t mean they’re running well. Much like the old golden Toyota Corolla that you’ll often see on the road from 1996 with over two hundred thousand miles on it, barely working is very different from working beautifully. The problem with cast iron is they’re made from a very brittle material, which means it sustains damage instead of flexing and moving with temperature changes. This is how old cast iron boilers often get cracks that cause problems with the overall effectiveness of their heating system. Even though a cast iron boiler can last up to 60 years or more, in that time it will not at all be running as well as the day it was first installed. That’s why steel boilers are so popular today. Steel flexes, unlike cast iron, so it doesn’t crack under pressure. They also have a much higher SEER rating and are more effective at stopping heat loss. Certain models of steel boilers have even been told to last at least 35 years, if not more. Unlike its cast iron cousin, the steel boiler will run just as perfectly as the day your had it installed with regular professional heating and AC care.