SAN DIEGO (KGTV) -- San Diego is expecting cooler temperatures this week, but another heatwave isn't far behind.
Local air conditioning companies have been swamped with service calls.
Philo Mitman is a service technician with ASI The White Glove Guys.
"When this heat does come, our call volume is tripled, quadrupled cause everyone needs it now," said Mitman.
Mitman said it's important to replace filters, possibly every month, depending on use.
"A dirty filter is the biggest thing as a homeowner that can cause bigger issues because if that is neglected the big motors can get seized up, they can overheat , you can block coils off which causes big, big problems," said Mitman.
Another common mistake, according to Mitman, is closing vents.
"Common misconception is that people close vents off to save money, when in fact, it actually costs you more money when you do that because your system is designed for a certain amount of air flow to be delivered to the home and if you start cutting that off , the system tries to make up for that so it works extra harder," said Mitman.
Mitman also suggests testing the system before it's needed.
"Run some stuff, it's like an old car, you can't just let it sit forever you gotta test it out."
