Furnace Gas Bill Calculator — Estimate Your Monthly Heating Cost
Published: July 23, 2026 — BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning — Greater Vancouver, BC
Quick Estimate Method
Monthly heating cost = (home square footage × 0.05) × (furnace AFUE factor) × (gas rate factor). For a 2,000 sq ft home with 96% AFUE: 2,000 × 0.05 = 100 × 0.96 (96% AFUE) = 96 × $0.65/GJ = $62/ month in mild weather, $150/month in cold weather. These are rough estimates.
Factors That Affect Your Bill
Home insulation: well-insulated homes use 30-50% less gas than poorly insulated homes. Thermostat setting: each degree above 20°C adds 2-3% to heating costs. Weather severity: Vancouver varies from 2,500-3,500 heating degree days annually. Colder winters increase bills by 20-40%. Furnace efficiency: a 96% furnace saves 16% vs an 80% furnace.
Using FortisBC Data
Your FortisBC online account shows daily gas usage in GJ. Track this month-over-month and year-over-year. Compare your GJ usage to the average for similar-sized homes in Vancouver. If your usage is 20%+ above average, you may have an efficiency issue or a leak. Call FortisBC for a usage analysis if you suspect a problem.