When the Fog Lifts and the Heat Hits: Common AC Problems During San Francisco’s Unexpected Heat Waves
San Francisco may be known for its cool, foggy summers, but when unexpected heat waves strike the Bay Area, the city’s air conditioning systems face unique challenges they weren’t designed to handle. According to the 2021 American Housing Survey released by the U.S. Census Bureau, San Francisco has the lowest rate of air conditioning ownership in the country, with 34 percent of households having central air and 11 percent having room air-conditioning, while the national average stands at 92 percent. This means that when temperatures soar beyond the typical 60-70°F range, both existing AC systems and hastily installed units can experience serious problems.
Why San Francisco’s Heat Waves Are Particularly Challenging for AC Systems
California’s Fourth Climate Change Assessment Report for the San Francisco Bay Area Region, released in 2018, found that between 1950 and 2005, the average annual maximum temperature increased by 1.7 degrees Fahrenheit. Additionally, the coastal fog that envelops large parts of the Bay and is responsible for respite from the summer heat is “less frequent than before.” San Francisco gets about 15 days per year with a temp over 90F. Typically, there are not more than 3 over 90 degree days in a row. By the 4th day of high temps, the fog gets sucked into the Bay Area and things cool down with the natural air conditioning provided by the ocean.
However, when heat waves do occur, they can be particularly brutal for air conditioning systems that aren’t used to sustained high-temperature operation. In San Francisco, temperatures above 85 degrees Fahrenheit have triggered increased ER visits, hospitalizations and deaths.
The Most Common AC Problems During Heat Waves
1. Frozen Evaporator Coils
Ironically, one of the most common problems during heat waves is frozen evaporator coils. In an optimally running air conditioner, the refrigerant vapor stays around 40 degrees. If the coils get cooler than that, they can freeze, and once they freeze, they continue to build up ice. That’s why it’s so important to turn your air conditioner off when this occurs.
But if they don’t have enough heat to absorb, the condensation on the coils can freeze. Low airflow can be caused by dozens of problems within the AC system, such as a malfunctioning blower fan, dirty air filters, or even damaged ductwork. Clogged air filters are one of the main reasons why AC evaporator coils freeze up. Replacing the air filter could solve the issue.
2. Compressor Overheating and Shutdown
During extreme heat, AC compressors work overtime and can overheat, causing the system to shut down as a safety measure. When the AC compressor overheats, it short cycles and turns off. A dirty air filter, dirty condenser coils, and low refrigerant all cause your compressor to overwork and short cycle.
High temperatures put extra stress on the AC, which can lead to parts like fan motors and compressors getting too hot. This can cause uneven cooling or even damage the system. Once the temperature exceeds 95°F, the air conditioning system must work overtime, as it becomes increasingly difficult for the outdoor unit to release the warm air back into the already hot surroundings.
3. Dirty Condenser Coils
During the winter months, dust and debris collect around the outside unit, in the compressor fins, and around the coils. This build-up acts as an insulator, and the refrigerant can’t effectively release the heat. Your compressor will keep running until it overheats because it can’t reach your thermostat temperature setting.
4. Low Refrigerant Levels
Fittings get loose, valves become faulty, and leaks can occur. As your refrigerant leaks, the compressor struggles to maintain pressure, causing the system to lose its ability to effectively cool. Your AC works harder to meet demand, eventually overheating and short cycling.
How to Address These Problems
Immediate Steps for Frozen Coils
First, you’ll want to turn off your air conditioner. Inspect your air conditioner inside and out for any obvious signs of condensation or ice. If there is ice, wait until it’s melted before trying to start the air conditioner again. Never chip away at the ice. You can do this by turning off your air conditioner and turning on only the fan. On your thermostat, you’ll find a button that will turn only the fan on. The air from the fan will help melt the ice on the compressor.
Preventing Compressor Overheating
During periods of extreme heat, it is advisable to set this control at 78 degrees Fahrenheit while you are present and increase it to 82 degrees when you’re not around in order to dodge power outages and hefty energy bills. Changing the air filter can be done without the help of a technician. Change your AC air filter every three months and after a wildfire.
Professional Solutions
For more serious issues like refrigerant leaks, electrical problems, or persistent overheating, professional help is essential. If you have a refrigerant leak in your air conditioning unit, it’s time to call a professional.
Why Choose Professional AC Repair Services
When San Francisco residents face AC problems during heat waves, having a reliable local service provider makes all the difference. Heating, Ventilation, and Air Conditioning (HVAC) services are crucial for homeowners and businesses in San Francisco, CA. With the city’s diverse weather patterns, including hot summers and chilly winters, having a well-functioning HVAC system is essential. Cue Sugar Bear Home Services. We offer various services to ensure your HVAC system is always running smoothly.
As a locally owned business, we understand the needs of South San Francisco residents. We are proud to be locally owned and serve South San Francisco and surrounding areas. Sugar Bear Home Services has the best highly trained, experienced, organized, pre-screened employees, the best parts, materials, equipment, and labor at 100% Satisfaction Guaranteed.
For residents experiencing AC problems during San Francisco’s heat waves, professional AC Repair in San Francisco, CA services can quickly diagnose and resolve issues before they lead to complete system failure. Our company’s technicians are committed to providing quality workmanship, ensuring that all HVAC services are done right the first time. We use high-quality materials and equipment and follow industry best practices to ensure that all work is done to the highest standards.
Prevention Is Key
Regular servicing decreases the need for repairs and lets you enjoy a cool home for the duration of your AC system’s service life. Follow these preventative maintenance tips to prevent your AC unit from overheating. The best way to prevent your air conditioner’s evaporator coil from freezing up is to have your AC unit inspected regularly by the technicians at Grove Heating & Cooling. We inspect your heating and air conditioner before every season to ensure everything is in working order. Regular maintenance can protect you during the intense heat and can also enhance the lifetime of your HVAC system.
San Francisco’s unique climate means that when heat waves do strike, they can overwhelm unprepared AC systems. By understanding these common problems and having a trusted local HVAC professional on standby, residents can stay cool and comfortable even when the city’s natural air conditioning takes a break.