Sources
Routine maintenance advice is checked against official consumer-safety and energy-efficiency sources where applicable, while manufacturer instructions and local rules remain the primary source for a specific product or property.
ENERGY STAR — heating and cooling maintenance
ENERGY STAR publishes homeowner maintenance guidance for central heating and cooling systems, including routine air-filter inspection and replacement based on system needs. Maintenance checklist
Health Canada — fire and carbon monoxide safety
Health Canada provides current home fire and carbon-monoxide guidance, including the importance of certified alarms and following emergency guidance when a CO alarm sounds. Fire safety in your home · Carbon monoxide: preventing exposure
U.S. Consumer Product Safety Commission
CPSC publishes smoke- and CO-alarm safety guidance and product warnings/recalls. Product placement, testing and replacement should follow applicable local requirements and manufacturer instructions. CO alarms
Ready.gov — household hazard preparation
Ready.gov provides preparedness information for hazards such as flooding, winter weather and power outages. This site uses those sources only for broad preparedness context, not emergency-response improvisation. Ready.gov
Product recalls
Homeowners should use the official recall authority for their country when checking appliances, alarms or other consumer products. Model and serial records make those searches more useful.