Winters in Minnesota aren’t just cold—they’re long and demanding. That’s why your furnace needs to be the right size for your home. A system that’s too small will run constantly and still struggle to keep up. Too large, and it’ll short-cycle, wasting energy and wearing out faster. Our St. Paul heating team is here to help you understand what “right size” really means for Twin Cities homes.
Why Furnace Size Matters
Getting the right fit isn’t just about comfort—it’s about performance and longevity. An undersized furnace works overtime, driving up energy bills and leaving rooms unevenly heated. An oversized one turns on and off too often, putting extra strain on parts and creating hot and cold spots. The right size system keeps your Minnesota home warm, efficient, and balanced all winter long.
How to Estimate the Proper Size
Furnaces are measured in BTUs (British Thermal Units), which tell you how much heat the system can produce. One BTU equals the energy needed to heat a pound of water by one degree Fahrenheit. To estimate the right size furnace, multiply your home’s square footage by the average BTUs needed per square foot—adjusting for your ceiling height and insulation. For most Twin Cities homes with standard 8-foot ceilings, here’s a general guide:
- 1,200 sq. ft. → 35,000–75,000 BTUs
- 1,500 sq. ft. → 45,000–90,000 BTUs
- 1,800 sq. ft. → 55,000–110,000 BTUs
- 2,100 sq. ft. → 65,000–125,000 BTUs
- 2,400 sq. ft. → 75,000–145,000 BTUs
Consider Minnesota’s Climate
Homes in the Twin Cities face far colder conditions than those in milder climates, which means you’ll likely need a higher-BTU system. Choosing a furnace built to handle long freezes and below-zero nights ensures steady warmth without overworking the system.
Talk with a Trusted Local Expert
If you’re not sure where to start, that’s where we come in. McQuillan has been helping Minnesota homeowners stay warm since 1883, and we know how to match the right furnace to your home, lifestyle, and budget. Whether you’re replacing an old unit or installing something new, we’ll make sure it’s built to handle a Minnesota winter. Schedule your free estimate today and find the perfect fit for your home.
