Switching from hot afternoons to cooler evenings
When you use cooling less and prepare to use heat, review your thermostat schedule and note any change in system performance. A season change does not require buying a new system.
Match the schedule to the mode
In cooling mode, a higher temperature setting asks for less cooling. A lower setting asks for more. Review automatic schedules so they fit when you are home and the comfort you need. Heat-pump setback settings may differ; use the equipment instructions or ask a technician.
Only use outdoor air when conditions, outdoor air quality, and security make it appropriate. Keep doors and windows closed while the AC runs. Do not seal ventilation openings, combustion-air openings, or attic vents.
Check filters and airflow
Check an accessible filter according to the manufacturer’s instructions. Keep return grilles and room registers clear of furniture. A recurring odor, water leak, or weak airflow needs investigation; it is not proof that the ducts need routine cleaning.
For planned care, see ENERGY STAR’s seasonal maintenance checklist.
Prepare for heating
Tell the office whether you use a furnace or heat pump and describe any past heating problem. Professional checks depend on the equipment. Do not open a gas appliance or attempt ignition repairs yourself.
If you smell gas, leave the area and call 911 from a safe place outside. Do not operate switches or try to find the leak. See PG&E’s gas-safety instructions.
A repair diagnosis has a visit charge. Read what a repair visit costs for the first-hour charge, additional time, parts, after-hours rates, and travel charges. The technician explains repair options and costs before you approve repair work.
