The U.S. Department of Energy recommends setting your thermostat to 68°F (20°C) when you're home and awake, then lowering it by 7–10°F for 8 hours per day (while sleeping or away). This single adjustment saves approximately 10% on annual heating costs — about $80–$120/year for the average household. Every 1°F you lower the thermostat below 70°F saves roughly 1–3% on your heating bill, depending on climate severity and home insulation.
Here's the data on exactly how much each degree saves, the best temperature schedules, and how to stay comfortable while cutting costs.
Savings Per Degree: The Data
| Thermostat Setting | Savings vs. 72°F | Annual Savings* | Comfort Level |
|---|---|---|---|
| 72°F (22°C) | Baseline | $0 | Warm — most people's comfort max |
| 71°F (21.5°C) | ~2% | $16–$30 | Barely noticeable difference |
| 70°F (21°C) | ~4% | $32–$60 | Standard comfortable |
| 69°F (20.5°C) | ~6% | $48–$90 | Comfortable with light clothing |
| 68°F (20°C) — DOE recommended | ~8% | $64–$120 | Comfortable for most; may want socks/sweater |
| 67°F (19.5°C) | ~10% | $80–$150 | Slightly cool; sweater recommended |
| 66°F (18.8°C) | ~12% | $96–$180 | Cool — noticeable for sedentary activities |
| 65°F (18.3°C) | ~14% | $112–$210 | Cool — heavy sweater or blanket needed |
The 1–3% rule of thumb: For every 1°F you lower the thermostat for 8 hours, you save roughly 1% on your heating bill; for a 24-hour setback, savings can approach 3% per degree. This is a common industry rule of thumb — the actual percentage depends on the temperature difference between inside and outside; savings are greater in mild climates and less in extreme cold because the heating load is proportionally larger.
Recommended Temperature Schedules
Schedule 1: Standard (Working Adults, No Pets)
| Time | Setting | Reason |
|---|---|---|
| 6:00 AM – 8:00 AM | 68°F | Morning wake-up and getting ready |
| 8:00 AM – 5:00 PM | 62°F | Away at work — 6°F setback |
| 5:00 PM – 10:00 PM | 68°F | Evening at home |
| 10:00 PM – 6:00 AM | 62°F | Sleeping — 6°F setback |
Estimated savings: 12–15% vs. maintaining 68°F 24/7, or about $100–$200/year.
Schedule 2: Work From Home
| Time | Setting | Reason |
|---|---|---|
| 6:00 AM – 10:00 PM | 68°F | Home all day — standard comfort |
| 10:00 PM – 6:00 AM | 62°F | Sleeping — 6°F setback |
Estimated savings: 6–8% vs. maintaining 68°F 24/7, or about $50–$120/year.
Schedule 3: Family with Small Children
| Time | Setting | Reason |
|---|---|---|
| 6:00 AM – 8:00 PM | 69–70°F | Slightly warmer for children's comfort |
| 8:00 PM – 6:00 AM | 64–66°F | Nighttime — moderate setback for kids' rooms |
Estimated savings: 4–6% vs. maintaining 70°F 24/7. The pediatric recommendation is to keep sleeping areas between 65–70°F for infants and toddlers.
Schedule 4: Maximum Savings
| Time | Setting | Reason |
|---|---|---|
| 6:00 AM – 8:00 AM | 66°F | Morning routine — sweater on |
| 8:00 AM – 5:00 PM | 58°F | Away at work — deep setback |
| 5:00 PM – 10:00 PM | 66°F | Evening at home — dress warmly |
| 10:00 PM – 6:00 AM | 58°F | Sleeping under warm bedding |
Estimated savings: 20–25% vs. maintaining 70°F 24/7, or about $160–$375/year. This schedule requires warm clothing indoors and quality bedding.
Don't set the thermostat below 55°F when away for extended periods (like vacations). Below 55°F, you risk frozen pipes — especially near exterior walls, in crawl spaces, or in poorly insulated areas. Pipe repairs from freezing can cost $1,000–$10,000+. The $10–$20 in heating costs to maintain 55°F during a week-long trip is cheap insurance.
Smart Thermostats: Automated Savings
Smart thermostats (Ecobee, Google Nest, Honeywell T9) automate temperature schedules and learn your patterns. The typical energy savings from a smart thermostat:
| Thermostat | Price | Claimed Savings | Real-World Savings* | Key Feature |
|---|---|---|---|---|
| Google Nest Learning | $180–$250 | 10–12% heating | 8–10% heating | Auto-learning schedule |
| Ecobee Smart Premium | $220–$250 | 23% heating | 10–15% heating | Room sensors for occupancy |
| Honeywell T9 | $170–$200 | Up to 10% | 7–10% heating | Room sensors, geofencing |
| Amazon Smart Thermostat | $60–$80 | ~8% | 5–8% heating | Alexa integration, budget |
| Emerson Sensi Touch | $120–$150 | Up to 10% | 6–9% heating | Simple interface, wide compatibility |
The biggest savings from a smart thermostat come from the geofencing feature — the thermostat detects when you leave and automatically adjusts the temperature, then restores it when you return. If your schedule is irregular (varying work hours, travel), geofencing captures savings that a fixed schedule misses.
Temperature and Health Considerations
Not everyone should follow the standard 68°F recommendation. Certain populations need warmer settings:
Elderly adults (65+): The WHO recommends indoor temperatures of at least 64°F (18°C) for healthy elderly adults and 70°F (21°C) for elderly adults who are frail, ill, or have limited mobility. Cold indoor temperatures increase the risk of hypothermia, cardiovascular events, and respiratory illness in older adults.
Infants and toddlers: The American Academy of Pediatrics recommends sleeping room temperatures of 68–72°F for infants. Overheating is a SIDS risk factor, so avoid going above 72°F — but below 65°F can cause discomfort and sleep disruption.
People with chronic illness: Conditions like Raynaud's disease, arthritis, and cardiovascular disease can be aggravated by cold indoor temperatures. Consult with your healthcare provider about appropriate indoor temperature ranges.
Comfort Without Cranking the Heat
These strategies help you feel comfortable at lower thermostat settings:
Use ceiling fans in reverse. Set ceiling fans to clockwise rotation on low speed. This pushes warm air (pooled at the ceiling) back down to living level without creating a draft. You can feel 2–3°F warmer without touching the thermostat.
Layer clothing. A good sweater or fleece adds roughly 3–4°F of perceived warmth. Warm socks, slippers, and a base layer make 66°F feel like 70°F.
Use heated blankets or mattress pads. An electric blanket uses 50–200 watts — costing $0.01–$0.03 per hour — far less than heating your entire home an extra degree. Use it to maintain sleep comfort while setting back the thermostat.
Cook and bake. Using your oven adds free heat to your home. Opening the oven door after cooking (once it's off) lets residual heat warm the kitchen.
Seal drafts. Cold air infiltration near windows, doors, and outlets makes you feel colder than the room temperature suggests. Draft stoppers under doors ($5–$10), outlet insulation gaskets ($0.50 each), and window film kits ($10–$20 per window) are inexpensive and immediately noticeable.
Key Takeaways
- 68°F when home, 60–62°F when sleeping or away is the optimal balance of comfort and savings for most adults.
- Setback duration drives the 1–3% spread: an 8-hour cutback saves ~1% per degree, while a 24-hour reduction can approach 3% — mild climates gain more per degree because heating load scales with the indoor-outdoor temperature gap.
- A 7–10°F setback for 8 hours/day saves about 10% — roughly $80–$200/year for a typical home.
- Smart thermostats save an additional 5–15% through automated scheduling and geofencing — the best ROI home upgrade under $250.
- Never set below 55°F when away to prevent frozen pipes. 58°F is a safer minimum in cold climates.
- Elderly adults need at least 64–70°F and infants need 68–72°F for health and safety.
- Comfort strategies (ceiling fans, warm clothing, heated blankets, draft sealing) let you feel comfortable at lower settings.
Frequently Asked Questions
Most homes take 30-60 minutes to recover from a 6-8°F setback. A well-insulated home with a properly sized furnace recovers faster. Smart thermostats learn your home's recovery time and pre-heat accordingly — so the house reaches your target temperature exactly when you wake up or arrive home. Set your schedule to start warming 30-45 minutes before your arrival.
Sources
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