What is a good AFUE rating for a furnace in Ottawa

For Ottawa's climate, look for a furnace with an AFUE rating of 90% or higher, with 95-98% being ideal for maximum efficiency and comfort.

AFUE (Annual Fuel Utilization Efficiency) measures how much of your fuel gets converted to heat versus what goes up the chimney. In Ottawa's harsh winters where your furnace runs heavily from November through March, every percentage point of efficiency translates to real savings on your heating bills.

Mid-efficiency furnaces (80-85% AFUE) are the minimum standard in Canada, but they're becoming less popular as homeowners realize the long-term costs. High-efficiency furnaces (90%+ AFUE) use condensing technology to capture heat that would otherwise be wasted, making them much more suitable for our climate where heating costs can represent 50-60% of your annual energy bill.

In the Ottawa market, most homeowners are choosing furnaces in the 95-98% AFUE range. These models typically cost $1,000-2,000 more upfront than mid-efficiency units, but the energy savings usually pay for the difference within 5-7 years. With natural gas prices and Ottawa's long heating season, a 96% AFUE furnace can save a typical home $300-500 annually compared to an 80% unit.

Important safety note: High-efficiency furnaces require proper installation and venting by TSSA-licensed technicians. The condensing process creates acidic condensate that needs proper drainage, and the venting requirements are different from conventional furnaces.

For Ottawa homes, I'd recommend focusing on furnaces with 95-98% AFUE ratings from reputable manufacturers. The sweet spot for most homeowners is around 96% AFUE - excellent efficiency without paying premium prices for that last 1-2% of efficiency.

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