When heating choices change a family’s month
When Maria Thompson turned up the thermostat last winter in Cleveland, she did it not for comfort but to keep her arthritis from flaring during long nights. Her heating bill rose by nearly 14%, forcing her to skip a planned dental visit.
Across the United States in 2025, millions of households face similar trade-offs between warmth, health and cost as experts update long-standing advice about the ideal indoor temperature.
Why experts say the old 19 °C guideline no longer fits
- New consensus: a revised baseline recommendation of 18 °C (64 °F) for general occupied living spaces, replacing the widely used 19 °C rule.
- Vulnerable groups: guidance now recommends 20–21 °C (68–70 °F) for older adults, infants, and people with chronic health conditions.
- Energy and cost focus: the change is framed as balancing health needs with energy savings; a 1 °C drop can cut heating energy use by about 6% on average.
- Flexibility emphasized: experts encourage room-by-room setups, timed heating and targeted insulation rather than one-size-fits-all thermostat settings.
People living this decision: short household portraits
Maria Thompson, 68, a retired teacher, keeps her living room warm during the day but turns down the bedroom thermostat at night. “I’m trying to protect my joints and my budget,” she says. “This year I learned small changes add up.”
Amar Patel, 35, who works from home in Austin, installed a zoned thermostat after a friend suggested lowering the whole-house setting. “We cut nightly heating by two degrees and my bill dropped almost 9% in one month,” he reports.
What officials are saying about the revised guidance
“This is practical advice to reduce household energy burdens while protecting those who need warmth most,” said Congressman Lisa Bradford, chair of a congressional task force on energy and low-income households. “States should pair guidance with assistance for insulation and heating repairs.”
“We are not telling people to freeze,” said an official from a federal energy program. “The shift from 19 °C to 18 °C is about targeted comfort and reducing unnecessary energy waste.”
How experts interpret the new temperature benchmark
Dr. Alan Myers, an HVAC researcher at the fictional Mid‑America Energy Institute, explained that the 19 °C rule came from older studies and a different energy context. “Modern building envelopes and heating technologies let us be more precise,” he said. “An 18 °C baseline for occupied spaces is a compromise: it saves energy while remaining safe for most adults.”
Industry modeling estimates that if 20% of U.S. households adopted the 18 °C baseline during heating months in 2025, national residential heating demand could fall by roughly 3–4% over the season. “That is meaningful for grid stress and household budgets,” Dr. Myers added.
Temperature guidance at a glance
| Situation | Old common rule | New expert guidance (2025, United States) | Notes |
|---|---|---|---|
| General occupied living areas | 19 °C (66 °F) | 18 °C (64 °F) | Baseline for adults without specific health needs; room-by-room control recommended. |
| Bedrooms (sleeping) | 19–20 °C | 16–18 °C (61–64 °F) | Cooler sleeping temperatures are linked to better sleep for many adults; use extra blankets when needed. |
| Infants and frail elderly | 19–21 °C | 20–21 °C (68–70 °F) | Higher baseline to reduce risk of cold-related illness and discomfort. |
| Elderly or chronic illness | 19 °C | 20–21 °C (68–70 °F) | Individual needs should guide settings; health providers may advise different temps. |
| Unoccupied periods / away | Lower by 2–4 °C | Lower by 3–5 °C | Setbacks save energy; ensure pipes are protected in cold climates. |
Steps households can take right now in 2025
Start with small, affordable changes: lower the thermostat by 1 °C during occupied hours and add a sweater or blanket. Those are simple moves with immediate savings.
Check for drafts, add weatherstripping, and insulate accessible areas such as attics. A one-time investment in sealing and insulation often pays back within a few years through lower bills.
Use zoned heating or space heaters safely: heat only the rooms you use and follow manufacturer safety advice to avoid fire risk. Consider programmable thermostats or smart controls to schedule setbacks when the house is empty.
Low-income households should explore federal and state assistance programs running in 2025 for furnace repair and home weatherization; many local community groups also offer targeted help.
Readers’ practical questions answered about the thermostat change
Q: What exactly changed from the old 19 °C rule?
A: Experts now recommend a baseline of 18 °C (64 °F) for most occupied living spaces in the United States in 2025, while advising warmer settings for infants, older adults, and people with health conditions.
Q: Is 18 °C safe for children and the elderly?
A: Not as a universal rule. Infants and frail elderly people generally need 20–21 °C (68–70 °F). Consult a doctor for personalized advice if a household member has health issues.
Q: How much money can I save by lowering the thermostat by 1 °C?
A: A commonly used estimate is around 6% less heating energy per degree Celsius, though actual savings depend on your home, fuel type and local climate.
Q: Won’t lowering the thermostat increase illness risk?
A: For most healthy adults, a slightly lower indoor temperature is not linked to higher illness risk if you dress appropriately and take targeted measures for vulnerable people.
Q: Should I stop heating unused rooms entirely?
A: It’s efficient to reduce heating in unused rooms, but maintain a minimum temperature to prevent pipe freezing and damp problems in cold regions.
Q: Are there smart thermostats that follow the new guidance?
A: Many programmable and smart thermostats allow custom schedules and room-by-room control; use them to apply the new baseline while warming specific rooms as needed.
Q: What if I can’t afford to upgrade insulation or the heating system?
A: Start with low-cost fixes: draft-proofing, curtains at night, and wearing warmer clothing indoors. Contact local community programs or utility low-income assistance options in 2025 for support.
Q: How do these recommendations affect renters?
A: Renters should discuss reasonable thermostat settings and maintenance needs with landlords. State energy programs in 2025 often include renter protections and repair funds.
Q: Will following this guidance reduce carbon emissions?
A: Yes, lower average indoor temperatures across many homes can reduce residential heating demand and cut emissions, especially where heating relies on fossil fuels.
Q: How should workplaces and public buildings respond?
A: Employers and facility managers should balance comfort, productivity and energy savings. Zoned controls, flexible dress codes and clear communication help implement changes smoothly.
Q: Does this apply the same across different U.S. climates?
A: The baseline is a guideline; colder states may need different approaches to avoid health risks, and milder regions may find the shift easier to adopt.
Q: Are there specific deadlines to comply with this guidance?
A: No legal deadlines—this is expert advice for households and institutions in 2025. Some local programs incentivize quick action through rebates or seasonal campaigns.
Q: Can lowering thermostat settings harm my heating system?
A: Properly maintained heating systems handle modest setbacks. Very large temperature swings or turning systems off for long periods in cold climates can strain equipment; consult a technician if unsure.
Q: How do I protect pipes if I lower heat when away?
A: Keep a minimum temperature above freezing in uninsulated spaces, allow trickle of water where needed, and insulate exposed pipes. In very cold areas, avoid long periods of minimal heat.
Q: Who should I contact for personalized advice?
A: Local energy advisers, community weatherization programs, and licensed HVAC technicians can provide tailored recommendations for your home and health needs in 2025.
Q: Will insurance or building codes change because of this guidance?
A: Not directly. Building codes and insurance practices evolve separately and may be influenced by broader policy debates; check state and local rules for details.
Q: How do I balance comfort and savings tonight?
A: Try reducing the thermostat by one degree, use a sweater or blanket, close doors to unused rooms, and run a humidifier if air feels too dry—small steps that preserve comfort.
Q: Can public housing implement these changes safely?
A: Public housing authorities should pair temperature guidance with repairs and insulation upgrades, prioritizing units with vulnerable residents and scheduling changes with tenant input.
Tags
heating, home energy, thermostat guidance, United States 2025, energy savings, public health
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