Choosing a furnace is a long-term decision. Here's what matters most.
Fuel type
Gas furnaces are common where natural gas is available and tend to cost less to run. Electric furnaces have lower upfront costs and are easier to install.
Sizing matters
An oversized furnace short-cycles; an undersized one never keeps up. A pro will perform a Manual J load calculation to size it correctly.
AFUE rating
Look for a high Annual Fuel Utilization Efficiency (AFUE) percentage — 90%+ is considered high efficiency.
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