South Bay and East Bay residents — the National Weather Service has issued a heat advisory for San Jose, Santa Clara, Los Gatos, and surrounding areas, with temperatures expected to hit the mid-90s to 100+ this week. If your AC hasn't been serviced recently, now is the time to check it — not after it fails during the hottest days of the year.
Here's what every Bay Area homeowner should know before the heat peaks.
1. Warning Signs Your AC Won't Survive the Heat Wave
Before temperatures spike, watch for these red flags:
Warm air blowing from vents even with the AC running
Unusual noises — clicking, grinding, or rattling from the outdoor unit
Weak airflow throughout the house
Short cycling — the system turns on and off frequently
Rising energy bills with no change in usage
If you're noticing any of these, don't wait. AC units are far more likely to fail under sustained heavy load — exactly what happens during a multi-day heat advisory.
2. Why AC Systems Fail During Heat Waves
During extreme heat, your AC works harder and longer than usual, often running nearly non-stop. This puts extra strain on:
Compressors, which can overheat and shut down
Refrigerant levels, which may already be low and cause the system to freeze up
Capacitors, a common failure point in aging units under continuous load
This is why HVAC companies across the Bay Area see repair calls spike sharply during heat advisories — systems that were "just barely working" finally give out.
3. What to Do Right Now
Change your air filter — a clogged filter restricts airflow and forces your system to work harder
Clear debris around your outdoor unit — leaves, dirt, and plants block airflow and reduce efficiency
Set your thermostat a few degrees higher during peak sun hours and pre-cool your home in the early morning
Avoid running major appliances between 4 PM and 9 PM — this also helps ease strain on the California power grid during Flex Alert periods
Schedule a same-day inspection if your system is showing any warning signs — don't wait until it fully breaks down mid-heat wave, when demand for repairs is highest
4. Emergency AC Repair — What to Expect
When your AC fails during a heat wave, every hour matters — especially for households with young children, elderly family members, or pets. Look for an HVAC company that offers:
True 24/7 emergency dispatch, not just daytime scheduling
No after-hours surcharge, so emergency service doesn't cost extra
Fully stocked trucks, so most repairs are completed in a single visit
Licensed, insured technicians who can quickly diagnose the issue
5. Long-Term: Don't Wait for the Next Heat Wave
If this week's advisory revealed problems with your system, consider scheduling a full AC tune-up or system evaluation once temperatures normalize. A pre-season inspection catches issues like low refrigerant, worn capacitors, or duct leaks before they turn into a mid-summer emergency.
Need AC Help Right Now?
Kailey Air Systems has served the San Jose Bay Area since 1999, with 24/7 emergency AC repair and no after-hours surcharge. If your system is struggling to keep up with this week's heat, schedule a same-day inspection or call (408) 300-0016.
Serving: San Jose, Santa Clara, Sunnyvale, Mountain View, Los Gatos, Campbell, Gilroy, Morgan Hill, Fremont, and the greater Bay Area.
