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What size furnace should I buy?

Square FootageFurnace BTU
1,000-1,200 sq. ft. Home40,000 - 60,000 BTU
1,200-1,500 sq. ft. Home60,000 BTU
1,500-1,800 sq. ft. Home60,000 - 80,000 BTU
1,800-2,500 sq. ft. Home80,000 - 100,000 BTU
2,500-3,500 sq. ft. Home100,000 to 120,000 BTU

HVAC Calculators

Free tools to estimate costs, size your furnace, compare savings, and troubleshoot problems —
built for Canadian homeowners.
🇨🇦 Canada-Specific Pricing
⚡ Instant Results
🔒 Free to Use
💰
Cost Calculator
Equipment + installation cost
Estimate the full installed cost of a new furnace in Canada based on efficiency, home size, and province.
📐
Size & BTU Calculator
Recommended BTU output
Find the right furnace size for your home. Avoid oversizing or undersizing — both waste money.
🎯
Recommendation Quiz
Entry / Mid / High-end furnace
Answer a few questions and get a personalized recommendation: entry-level, mid-range, or high-efficiency.
📈
Savings Calculator
Annual savings from upgrading
See how much you could save per year by replacing your old furnace with a modern high-efficiency model.
⚡
Operating Cost Calculator
Monthly & annual gas cost
Calculate what your furnace costs to run each month and annually based on AFUE rating and local gas rates.
🔧
Repair or Replace Quiz
Scored recommendation
Should you repair or replace your furnace? Answer a few questions and get a scored recommendation with reasoning.
🩺
Troubleshooting Wizard
Diagnose furnace problems
Furnace not working? Describe your symptoms and get a diagnosis — before calling a technician.

AC Calculators Hub

Free tools to estimate costs, size your air conditioner, compare savings, and troubleshoot problems —
built for Canadian homeowners.
💰
AC Cost Calculator
Equipment + installation cost
Estimate the full installed cost of a new air conditioner in Canada — equipment, labour, permits, and disposal — based on home size and province.
📐
AC Size & Tonnage
Right tonnage for your home
Find the correct AC tonnage for your home. Avoid oversizing or undersizing — both waste energy and reduce comfort.
🎯
AC Recommendation Wizard
Find your ideal AC system
Answer a few questions and get a personalized AC system recommendation — central AC, ductless mini-split, heat pump, or window unit.
🔧
AC Repair Cost Calculator
Estimate repair cost by symptom
Describe your AC problem and get an instant estimate of what the repair should cost — so you’re never overcharged by a technician.
🩺
AC Troubleshooting Wizard
Diagnose AC problems
AC not cooling? Use our step-by-step wizard to diagnose the problem and get recommended next steps — before calling a technician.
⚡
AC Operating Cost
Monthly & annual electricity cost
Calculate what your AC unit costs to run each month and annually — based on SEER rating, usage hours, and your provincial electricity rates.
📈
AC Savings Calculator
Savings from upgrading your AC
See exactly how much you could save per year by replacing your old air conditioner with a modern high-efficiency SEER2-rated model.

Why Use FurnacePrices.com Calculators?

Buying or replacing a furnace is one of the biggest home investments you’ll make. Our free calculators are built specifically for Canadian homeowners, with pricing data from real HVAC contractors across Ontario, British Columbia, Alberta, and beyond. Whether you want to know how much a new furnace costs, what size you need, or whether it’s time to stop repairing your old unit, we have a tool for every decision.
All calculators are Canada-specific, updated regularly with current natural gas rates, labour costs, and provincial rebate programs — so you get estimates you can actually rely on.