Households notice the change as winter bills and comfort collide
When the thermostat in Ruth Carter’s three-bedroom home in Cleveland dropped one degree this week, she felt it immediately — thinner blankets, slippers instead of bare feet and a small but visible dip in the monthly heating estimate. Like millions across the United States, Ruth is juggling comfort, health and rising energy bills as national guidance on home heating shifts in 2025.
The move away from the one-size-fits-all “19 °C rule” aims to give families clearer, more flexible guidance that reflects how people actually live, work and sleep in US homes this year.
What energy advisers now want you to know about your thermostat
- National expert guidance issued in 2025 replaces a single fixed target (19 °C / 66 °F) with a recommended temperature band and situational settings for living, sleeping and unoccupied periods.
- Recommended baseline for occupied daytime living areas is 20 °C (68 °F) as a comfortable default in the United States.
- Night-time and away-from-home settings are advised at 16–18 °C (61–64 °F) to conserve energy without compromising most adults’ health.
- Special settings are advised for households with infants, older adults or medically vulnerable people, where slightly higher room temperatures may be prudent.
- Guidance emphasises layering, targeted heating (zone control), and simple behavioural steps that can lower bills by 5–12% compared with fixed single-number approaches.
People on the street: how families are adapting
“We used to leave the thermostat on 19 °C because that’s what everyone told me,” said Ruth Carter, 52, a nurse and mother of two. “Now my husband and I set the living room to 20 °C in the evening and drop it to 17 °C overnight. It feels fine and the kids wear extra socks.”
Marcus Lee, 68, a retired teacher in Phoenix, explained the practical changes: “I installed a programmable thermostat this month. I keep the house at 20 °C when I’m awake, lower it while I nap, and turn heating off when I’m at the seniors’ center. My last bill was about 8% lower than the same month last year.”
Officials describe why the old single-number rule ended
“The 19 °C number served as a simple benchmark, but it overlooked the wide variety of household needs and climates we see across the United States,” said Dr. Helen Rivera, Director of Residential Energy Guidance at the U.S. Energy Efficiency Council. “The new approach recognises a range of safe, efficient temperatures and encourages targeted strategies that reduce consumption without compromising well-being.”
At a briefing in early 2025, a senior health adviser said the change also reflects new assessments of indoor health and thermal comfort. “For most adults, brief exposure to slightly lower temperatures is safe if clothing and bedding are adjusted,” the adviser said. “But households with infants or people with specific medical conditions should follow tailored recommendations.”
How specialists interpret the numbers and what the data suggest
Energy analysts note that thermostat choices have a measurable impact on household energy use. Experts estimate that setting a home just 1 °C lower for extended periods can reduce heating energy consumption by roughly 3–5% on average.
In practical terms, switching from a rigid 19 °C approach to the flexible band recommended in 2025 — occupying living areas at 20 °C while lowering to 16–18 °C at night or when away — can yield household savings of 5–12% over a winter season, depending on home insulation and heating system efficiency.
Old guidance versus new advice: quick reference for homeowners
| Feature | Previous 19 °C Rule | 2025 Recommended Approach (United States) |
|---|---|---|
| Core message | Single fixed target for homes: 19 °C (66 °F) | Flexible band with situational settings: 20 °C (68 °F) living; 16–18 °C (61–64 °F) night/away; tailored for vulnerable groups |
| Energy impact | Simplicity, mixed efficiency results across climates | Potential 5–12% seasonal savings using targeted setbacks and zoning |
| Health considerations | One-size-fits-all; limited nuance | Explicit caveats for infants, older adults and people with medical needs |
| Who benefits most | Households that follow the single rule uniformly | Households using programmable thermostats, zone heating, and behaviour changes |
| Practical action | Set and forget at 19 °C | Use schedule setbacks, insulation checks and targeted heating for occupied rooms |
Practical steps families can take this winter in the United States
Start with a simple thermostat schedule: set living rooms to 20 °C (68 °F) while awake, reduce to 16–18 °C (61–64 °F) at night and when the house is empty.
Check your heating system and insulation — even small air leaks or a dirty filter can raise consumption by several percent. Consider targeted heating for occupied rooms and use layers of clothing to keep comfortable at slightly lower indoor temperatures.
For renters and landlords: document agreed temperatures in tenancy agreements if heating is included, and discuss cost-sharing where upgrades are needed. In 2025 many local energy programs are offering assessments and rebates, so check municipal announcements in your state for eligibility.
Common reader questions answered about the new guidance
Q: Who issued the new guidance and is it mandatory?
A: A coalition of energy and public health advisers released the guidance in 2025 to inform best practice across the United States. It is advisory, not a federal regulation; states and local authorities may choose to adopt related requirements.
Q: Why move away from the 19 °C rule?
A: Experts determined a single-number rule did not reflect varying needs across climates, building types and household health requirements. The new advice provides a flexible band with context-specific settings.
Q: What exactly should I set my thermostat to if I live in the US?
A: Use 20 °C (68 °F) as a comfortable daytime baseline, lower to 16–18 °C (61–64 °F) at night or when away, and raise temperatures slightly for infants, older adults or people with medical needs.
Q: How does this affect vulnerable people?
A: The guidance explicitly recommends higher minimums for households with infants, older adults or medically vulnerable people. Consult a healthcare professional for personalised advice.
Q: Is this guidance the same across all US states?
A: The national guidance provides a framework, but state and local bodies may issue supplementary recommendations or rules to reflect local climate and housing stock in 2025.
Q: Will following the new guidance save money?
A: Many households can expect savings. Analysts estimate targeted setbacks and smarter schedules can deliver 5–12% seasonal savings compared with a single fixed setting approach.
Q: What if my home uses Fahrenheit only?
A: For readers using Fahrenheit, recommended settings translate to about 68 °F for daytime living and 61–64 °F for night/away periods.
Q: Do I need a smart thermostat to follow this advice?
A: No. Programmable or manual timers work. Smart thermostats can make scheduling easier and can save additional energy through adaptive learning, but they are not required.
Q: How should landlords and tenants handle the change?
A: Landlords should ensure heating systems are safe and capable of achieving recommended temperatures. Tenants should discuss reasonable setpoints and repairs with landlords; documenting agreements helps prevent disputes.
Q: Does this advice affect workplace or public building temperatures?
A: The guidance is aimed primarily at domestic settings. Employers and public building managers should consult workplace safety and local codes for appropriate indoor temperature policies in 2025.
Q: Are there specific energy-saving tips beyond changing the thermostat?
A: Yes — seal drafts, add insulation, service heating systems, use zone heating, wear layers, and close doors to unused rooms. Small changes can compound to measurable savings.
Q: How quickly will households notice the difference?
A: Behavioural changes like a one-degree setpoint shift can show up within a single billing cycle; larger savings from insulation or equipment upgrades take longer but are more durable.
Q: Is there any health risk from keeping homes slightly cooler?
A: For most healthy adults, short exposures to slightly cooler indoor temperatures are safe when clothing and bedding are adjusted. Those with health conditions should follow tailored guidance.
Q: Should people in very cold climates follow different numbers?
A: The guidance recommends the flexible band be applied with judgement in colder regions of the United States; local authorities may offer more detailed thresholds for extreme climates.
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