Why Does the Same Temperature Feel Different Season to Season?

Why does your thermostat setting feel different from season to season—even when the number doesn’t change? Many homeowners worry that this means something is wrong with their HVAC system, but in most cases, it’s simply the way our bodies respond to environmental changes. While a smart thermostat, humidifier, or seasonal tune-up can certainly help, the real reasons are rooted in science and human perception.

Here’s why 70°F never feels quite the same in July as it does in February:

Humidity

Humidity plays a much bigger role in comfort than most people realize.

• Summer air is more humid, which makes indoor temperatures feel warmer and heavier.
• Winter air is much drier, making the same temperature feel cooler.

Even with the thermostat set the same, your body experiences the air differently based on moisture levels.

Sunlight

Sunlight—or the lack of it—can influence how warm or cool a room feels.
In New Hampshire, daylight hours shift dramatically throughout the year. Sunlight adds radiant heat, making a room feel naturally cozier. In seasons with less sun, indoor spaces may feel cooler even at the same temperature setting.

Bodily Adaptation

Our bodies adjust to the seasons.

• At the end of summer, we’re used to heat, so 70°F can feel refreshing.
• After months of cold winter weather, that same 70°F may not feel warm enough, because our baseline for “comfortable” has shifted.

This natural adaptation affects how we perceive temperature in every season.

Air and Drafts

Airflow also impacts comfort.
In colder months, even a minor draft can feel dramatic. Warm air rises and cold air sinks, so chilly air often settles at floor level—right where we feel it most.

If drafts or cold spots seem persistent, it may be time to explore:

• Better insulation
• Duct sealing
• A professional HVAC evaluation