How Cold Weather Affects Furnace Efficiency (and How to Save on Energy Bills)
January in Black Eagle and the greater Great Falls area brings the kind of cold that makes your furnace work overtime. While Montana winters are just part of life here, many homeowners don’t realize how that deep freeze impacts their heating system’s performance—and their monthly energy bill.
At Northern Heating & Cooling, we’ve spent decades helping folks stay warm through the harshest stretches of winter. Here’s what happens to your furnace when temperatures drop and what you can do to keep your system running efficiently.
Why Furnaces Struggle in Extreme Cold
1. Longer Run Times
When temperatures plunge, your furnace has to run more often and for longer cycles just to maintain indoor comfort. This extra workload naturally decreases efficiency and increases energy use.
2. Heat Loss in Older Homes
Many Montana homes—especially those built years ago—aren’t as well insulated as newer builds. That means more warm air escapes, forcing your furnace to work harder to replace it.
3. Reduced Efficiency From Dirty Filters or Wear
Cold weather often exposes underlying issues like clogged filters, worn parts, and airflow problems. These can slow your system down exactly when you need it most.
How to Boost Efficiency and Lower Your Energy Bill
1. Change Your Air Filter Regularly
A clean filter ensures your furnace doesn’t have to fight against restricted airflow. Replacing it every 1–3 months can make a noticeable difference.
2. Seal Air Leaks and Improve Insulation
Small leaks around windows, doors, and ductwork add up. Sealing them keeps your warm air inside—reducing the strain on your furnace and lowering your monthly costs.
3. Use a Programmable or Smart Thermostat
Letting your system rest while you’re asleep or away helps keep energy bills in check without sacrificing comfort. Smart thermostats also learn your habits, improving efficiency automatically.
4. Schedule a Winter Furnace Tune-Up
Professional maintenance ensures everything is clean, calibrated, and running safely. A well-maintained furnace doesn’t just perform better—it lasts longer.
5. Consider Upgrading to a High-Efficiency Furnace
If your system is 15+ years old, upgrading could cut your energy costs significantly while improving comfort on the coldest days.
Stay Warm, Safe, and Efficient This Winter
At Northern Heating & Cooling, we’ve been helping Montana families get the most out of their heating systems since 1963. If your furnace is struggling to keep up or your energy bills are creeping higher each month, we’re here to help with inspections, repairs, maintenance, and expert advice.
Need a mid-winter furnace check or have questions about improving efficiency?
Contact Northern Heating & Cooling in Black Eagle today—your trusted local HVAC provider for more than 60 years.