As summer temperatures climb across San Tan Valley and the rest of central Arizona, air conditioning systems work overtime to keep homes cool. But fire officials say neglected or poorly maintained units can create serious safety risks.

According to Rural Metro Fire, firefighters across Maricopa and Pinal counties respond to emergencies involving cooling systems every year — including fires caused by electrical problems and overheating equipment.

In areas like San Tan Valley, where summer temperatures regularly reach triple digits, air conditioners run almost constantly. That heavy demand makes regular maintenance especially important.

Nationally, residential air conditioning systems are involved in about 2,300 fires each year. These incidents cause dozens of injuries, a small number of deaths, and millions of dollars in property damage.

Window and portable units are responsible for more than half of those fires, often due to electrical issues, improper use, or overloaded circuits.

Fire officials say many of these incidents can be prevented with routine maintenance and proper installation.

Most AC-related fires are linked to mechanical or electrical problems. According to Rural Metro Fire, the most common causes include:

• Electrical issues: Faulty wiring, loose connections, overloaded circuits, or using extension cords and power strips with AC units can increase fire risk. Older units and do-it-yourself installations may also create hazards.
• Restricted airflow and overheating: Dirty air filters, blocked condenser units, or closed vents can force systems to work harder than designed. This strain can cause motors and compressors to overheat.
• Mechanical wear and buildup: Dust, dirt, pet hair, and lack of routine maintenance can damage internal components like bearings and capacitors.
• Flammable materials near the unit: Leaves, dry plants, cardboard, or other combustible items near outdoor AC units can ignite if a unit sparks or overheats. This risk is especially concerning in Arizona's dry climate.
• Excessive strain on older systems: Running an aging or undersized system nonstop during extreme heat can increase the chance of failure.

Fire officials note that AC-related fires often occur in the afternoon and evening, when cooling demand is highest.

In communities like San Tan Valley — where the area is served by Rural Metro Fire — prevention is one of the most important ways to reduce fire risk.

Simple steps such as changing air filters, keeping outdoor units clear of debris, and scheduling professional maintenance can help prevent problems before they become dangerous.

If residents notice smoke, flames, or signs of an electrical problem with their cooling system, they should call 911 immediately.

For non-emergency questions about home fire safety, smoke alarms, or community resources, residents can contact Rural Metro Fire at 480-627-6200 or email This email address is being protected from spambots. You need JavaScript enabled to view it..

Fire officials say a little attention now can go a long way toward preventing fires later.

"Stay cool, stay vigilant, and remember — a few simple steps today can prevent a fire tomorrow."