The steps you take before you upgrade your furnace can make a significant difference in comfort, energy costs and durability. For example, modern combustion furnaces are highly efficient at turning natural gas into heat energy. As a result, replacing an old furnace not only will save you money, but can lower your environmental footprint, too. Other factors to consider include selecting a first-rate HVAC contractor and choosing the right system size. Choosing a new furnace for your Des Moines area home is not a decision to take lightly so we created a simple guide to help you select the right furnace.