What size furnace do I need for my Ottawa home

Furnace sizing depends on your home's heat loss calculation, which considers square footage, insulation, windows, and Ottawa's cold climate requirements. A properly sized furnace is crucial for efficiency, comfort, and longevity.

Heat loss calculations are the only accurate way to determine furnace size. This involves measuring your home's envelope, assessing insulation levels, counting windows and doors, and factoring in Ottawa's design temperature of -23°C. A furnace that's too small won't keep you warm during our harsh winters, while an oversized unit will short-cycle, waste energy, and create uneven temperatures.

Rough sizing estimates for Ottawa homes typically range from 40-60 BTU per square foot, but this varies significantly. A well-insulated 2,000 sq ft home might need an 80,000 BTU furnace, while a poorly insulated home of the same size could require 120,000 BTU. Older Ottawa homes often need larger furnaces due to less insulation and more air leakage.

Professional sizing is essential because incorrect sizing is one of the most common HVAC mistakes. Our technicians use Manual J heat loss calculations to determine the exact size needed for your specific home. We also consider your existing ductwork capacity, as undersized ducts can limit furnace performance regardless of size.

Ottawa's climate demands reliable heating equipment that can handle extended periods below -20°C. We typically recommend high-efficiency furnaces (90%+ AFUE) that are properly sized rather than oversized, as they'll provide better comfort and lower operating costs throughout our long heating season.

For an accurate furnace sizing assessment for your Ottawa home, request a free consultation where we'll perform a proper heat loss calculation and recommend the ideal furnace size for your specific situation.

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