Going again to the last level, if you’ve seen signs of rust or cracks developing in or around your furnace, it’s time to switch.
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If you have had maintenance a minimum of annually in your furnace, your unit may simply live well beyond 15 years.
Ask your HVAC contractor for the best home furnace with an Energy Star ranking.
Commercial furnaces (i.e., those with heating capacities of 225,000 Btu/h or greater) and weatherized furnaces are excluded.
While furnaces generally work the same, they are powered differently.