Heating takes more energy than cooling in most homes. Globally, heating accounts for over 30% of a building’s total energy consumption, while cooling accounts for roughly 6%. Even in warmer parts of the United States, the energy required to heat a home through winter typically outpaces what air conditioning demands in summer. The reasons come down to physics, the size of the temperature gap your system has to bridge, and how different fuel sources perform.
Why Heating Demands More Energy
The energy needed to change air temperature follows a straightforward formula: energy equals the heat capacity of air multiplied by the temperature difference between where you start and where you want to end up. That temperature difference is the key variable. In winter, the gap between outdoor and indoor temperatures is usually much larger than in summer.
Consider a home in Chicago. On a January night, outdoor temperatures might drop to 10°F while you want your home at 70°F. That’s a 60-degree gap your heating system has to overcome. In July, outdoor temperatures might hit 95°F while you’re cooling to 75°F, a gap of only 20 degrees. The heating load in this example is three times larger than the cooling load, and that ratio holds in most of the country north of the Sun Belt.
Winter also creates a relentless drain on energy through your walls, roof, and windows. Because warm air rises and heat naturally flows toward cold, your home is constantly losing heat to the outdoors. The building envelope absorbs warmth from indoor air through convection and radiation on interior surfaces, conducts it through walls and insulation, and releases it outside. This process runs nonstop whenever indoor temperatures exceed outdoor temperatures, and the colder it gets outside, the faster heat escapes. In summer, heat flows inward, but the driving force is weaker because the temperature difference is smaller.
Where You Live Changes the Equation
Energy professionals measure heating and cooling demand using “degree days,” which track how far average daily temperatures stray from a comfortable baseline (usually 65°F). A city like New York experiences far more heating degree days than cooling degree days each year, reflecting its cool climate. Houston flips the ratio, with cooling degree days dominating.
Across most of the United States, heating degree days exceed cooling degree days, sometimes by a factor of three or four to one. Only the deep South, parts of the Southwest, and southern Florida consistently see cooling demand rival or exceed heating demand. If you live anywhere with a real winter, heating is almost certainly your biggest energy expense. EPA data also shows that heating degree days have generally decreased over recent decades across the North and West, while cooling degree days have increased, but heating still leads in most regions.
Fuel Type and Equipment Efficiency
Heating and cooling also differ in how efficiently they convert fuel into comfort, and this widens the gap in both energy use and cost.
Most American homes heat with natural gas furnaces, which typically operate at around 85% efficiency. That means 15% of the fuel’s energy is lost as exhaust. At roughly $0.70 per therm, natural gas heating costs about $8.24 per million BTUs. If you heat with electric resistance (baseboard heaters or space heaters), the efficiency is technically 100%, but electricity is expensive per unit of energy. At $0.11 per kilowatt-hour, electric resistance heating costs about $32.24 per million BTUs, nearly four times the cost of gas.
Air conditioners and heat pumps, on the other hand, don’t generate cold or hot air from scratch. They move heat from one place to another using a refrigerant cycle, which lets them deliver more heating or cooling energy than the electricity they consume. This is why a heat pump running in cooling mode can feel remarkably efficient. The federal minimum efficiency for split-system heat pumps in 2025 is 14.3 SEER2 for cooling and 7.5 HSPF2 for heating. Those numbers aren’t directly comparable, but the pattern they reveal matters: the same heat pump is significantly more efficient when cooling than when heating. Cold outdoor air makes it harder for the system to extract heat, so heating performance drops as temperatures fall.
A heat pump operating in heating mode costs roughly $10.75 per million BTUs, comparable to natural gas. But in very cold climates, heat pumps lose efficiency and may need backup electric resistance heat, which drives costs up sharply.
How Seasonal Run Time Adds Up
Beyond the per-hour energy draw, heating systems simply run for more hours in most climates. Winter lasts longer than the peak cooling season in much of the country. A furnace in Minnesota might run six months of the year, while the air conditioner runs for three. Even in moderate climates like the mid-Atlantic, heating season stretches from October through April, while heavy air conditioning use is limited to June through August.
The combination of larger temperature gaps, longer seasons, and the physics of heat loss through the building envelope means heating typically accounts for the single largest slice of a home’s energy budget. Cooling is a meaningful expense, especially in the South, but it rarely matches the cumulative energy demand of keeping warm through winter.
Practical Ways to Narrow the Gap
Because heating dominates energy use, improvements to your home’s thermal envelope deliver the biggest payoff in winter. Adding insulation to your attic, sealing air leaks around windows and doors, and upgrading to double- or triple-pane windows all slow the rate at which heat escapes. These same improvements help in summer too, but the winter savings are larger because the temperature difference driving heat loss is greater.
Upgrading from an older furnace to a high-efficiency model, or switching to a cold-climate heat pump, can also cut heating energy significantly. Modern cold-climate heat pumps maintain reasonable efficiency down to 5°F or lower, making them viable in areas where older models would have struggled. On the cooling side, a properly sized air conditioner with a higher efficiency rating helps, but since cooling is already the smaller load for most households, the absolute savings are more modest.
If you’re in one of the few regions where cooling genuinely rivals heating (southern Texas, Arizona, southern Florida), the calculus shifts. Shade trees, reflective roofing, and efficient air conditioning become the priority investments. But for the majority of the country, the answer is clear: keeping warm takes more energy than staying cool.