When you’re shopping around for a new furnace, you might start to develop a new vocabulary. There’s the AFUE—Annual Fuel Utilization Efficiency—that helps you determine the efficiency of your new system. And another set of terms you may see used often are as follows: “one-stage,” “two-stage,” and “modulating” furnace.
You might notice that modulating and two-stage furnaces receive a higher rating for efficiency and performance (or simply find that the price for these units is higher). Wondering why this is? Does a two-stage or modulating furnace really make that much of a difference? Find out in today’s guide to these powerful systems.