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Ideal Home Temperature - Comfort and Energy Savings

Striking the right indoor climate means balancing comfort with a lower utility bill.

With a few expert-backed thermostat settings and simple habits, you can stay cozy in winter and cool in summer—without overspending.

The official recommendation: your smart starting point

The U.S. Department of Energy (DOE) recommends adjusting your thermostat by season and by whether you’re home, asleep, or away. Following these guidelines can trim heating and cooling costs by about 10% a year while maintaining comfort.

The strategy is simple: set a comfortable temperature when you’re home and awake, then dial it back (or up, in summer) when you’re sleeping or out. A programmable or smart thermostat automates these changes so you don’t have to remember.

Ideal home temperature in the winter

When you’re home and awake

Aim for about 68°F (20°C) during the day. Most households find this comfortable with typical winter wear like sweaters and warm socks. Each degree you nudge higher can raise energy use noticeably, so try layering, using a throw blanket, or sipping a warm beverage before bumping the heat.

Ceiling fans on low can also help distribute warm air that collects near the ceiling. If you use a humidifier to keep indoor relative humidity around 30–50%, spaces often feel warmer at the same temperature; learn more about humidity and comfort from the EPA.

When you’re asleep or away

For eight or more hours, the DOE suggests setting your thermostat back 7–10°F from its daytime level. If you run 68°F while awake, that means roughly 58–61°F (14–16°C) overnight or while you’re out. Because you’re under blankets, the difference is barely noticeable—but the savings add up.

A smart thermostat makes setbacks effortless and can pre-warm the house before you wake or return. Popular options include Google Nest and ecobee. If you heat with a heat pump, choose a model designed for heat pumps so setbacks don’t trigger inefficient auxiliary heat.

Ideal home temperature in the summer

When you’re home and awake

Set the thermostat to about 78°F (26°C). It may sound warm at first, but your body adapts quickly—especially with air movement. A ceiling fan can make a room feel 4°F cooler while using a fraction of an air conditioner’s energy. In summer, set fans to spin counterclockwise to push air down; see guidance from Energy.gov.

Keep blinds or shades closed on sunny exposures during peak afternoon hours. Thermal or reflective window treatments can further cut solar heat gain; explore options at Energy Saver.

When you’re asleep or away

Raise the setpoint a few degrees overnight—around 82°F (28°C) is a good target for many homes. If the house will be empty, set it even higher, roughly 85°F (29°C), so your AC isn’t working to cool an empty space. Smart thermostats with geofencing can detect when everyone’s out and adjust automatically.

High humidity can make 78°F feel warmer. Running a dehumidifier or using the “dry”/dehumidify mode on some systems improves comfort at higher setpoints. For efficient models, check out ENERGY STAR certified dehumidifiers.

Factors that influence your perfect temperature

  • Age and health: Infants and older adults can be more sensitive to temperature swings. For nurseries, many pediatricians suggest keeping the room around 68–72°F (20–22°C); see the American Academy of Pediatrics for guidance.
  • Humidity: High humidity makes spaces feel hotter; low humidity can feel cooler but drier. Aim for 30–50% relative humidity for comfort and air quality (EPA). Pairing dehumidification with a 78°F summer setpoint often feels just right.
  • Home insulation and sealing: Well-insulated, airtight homes hold heat in winter and keep it out in summer. If you have drafty windows or thin attic insulation, you may need different setpoints until upgrades are made. Learn about insulation basics and air sealing.
  • Personal preference: Comfort is subjective. Use these settings as a baseline, then adjust by a degree or two to find your family’s sweet spot for an ideal home temperature.

More tips for comfort and savings

  • Install a programmable or smart thermostat: Automate setbacks and preheating/precooling. Look for ENERGY STAR certified models and check your utility for rebates.
  • Seal air leaks: Weatherstrip doors, caulk window gaps, and seal penetrations around plumbing and wiring to keep conditioned air inside. The DOE’s guide to air sealing your home shows where to start.
  • Use window coverings strategically: Open curtains on sunny winter days for free solar heat; close them on hot afternoons in summer. Consider insulating shades and films.
  • Maintain your HVAC system: Schedule annual tune-ups and replace filters regularly (every 1–3 months, or as needed). Learn more about filters from ENERGY STAR.
  • Optimize ceiling fans: Counterclockwise in summer to create a cooling breeze; clockwise in winter on low to recirculate warm air. Turn fans off when you leave the room—they cool people, not spaces.
  • Check for incentives: Rebates for smart thermostats, insulation, and HVAC upgrades are common. Search local offers or visit DSIRE to explore U.S. incentives.

Frequently asked questions

What’s the most energy-efficient temperature to set?

The most efficient setting is the one closest to the outdoor temperature that still keeps you comfortable. As a baseline, try 68°F in winter and 78°F in summer when you’re home, then adjust further while you sleep or are away. See DOE guidance on thermostat settings.

Is it cheaper to leave the AC on all day or turn it off?

For short trips, it’s usually better to raise the setpoint several degrees rather than turning the system off. That prevents your AC from working extra hard to cool a hot house when you return. If you’ll be gone for longer, raising the setpoint to around 85°F works well; a smart thermostat can start precooling before you arrive.

How much can I really save by adjusting my thermostat?

Setting back your thermostat 7–10°F for at least 8 hours daily can save about 10% a year on heating and cooling, according to the DOE. Actual savings depend on your climate, home, and utility rates, but most households see meaningful reductions—especially when pairing setbacks with air sealing, insulation, and smart controls.

Start with these evidence-based setpoints, make small tweaks based on your comfort, and use automation to handle the rest. Soon you’ll lock in your ideal home temperature—and lower bills—year-round.