Residents of Southern California enjoy fantastic weather year-round. However, it does get hot enough in the summer that you wouldn't want to go without reliable AC to maintain your home’s comfort. That’s why it’s important to recognize when your AC is nearing the end of its life. Planning ahead helps you avoid getting stuck in the heat and gives you time to choose the right replacement. Here are some common signs it may be time to install a new air conditioning system.

Your AC Is Over 10 Years Old

On average, a well-maintained AC in Southern California can last 12–15 years, sometimes even longer. Once your AC reaches its 10th birthday, it’s wise to start thinking about replacement. That’s usually when wear and tear begin to add up, even if the system is still running. While you may get a few more years out of it, planning early allows you to research your options and avoid a rushed purchase when it finally breaks down.

Your AC Uses a Refrigerant That’s Being Phased Out

If your system was manufactured before 2010, there’s a chance it still uses R-22 refrigerant. Since 2020, R-22 can no longer be produced or imported into the U.S., meaning only reclaimed supplies are available—and they’re very expensive. If your AC needs a refrigerant recharge, repairs may cost more than the system is worth. Many newer ACs use R-410A refrigerant. It’s still available today, but under current regulations, it’s gradually being phased down in favor of more environmentally friendly options. If your system uses R-410A, you don’t need to replace it immediately—it will remain serviceable for many years—but be aware that costs could rise over time.

You're Noticing Rising Cooling Costs

Electricity rates in Southern California are already high, so it doesn’t take much inefficiency for costs to add up. As ACs age, they naturally lose efficiency, especially without regular maintenance like coil cleaning and filter changes. A poorly maintained system may struggle to keep up, driving your bills higher. While it’s not accurate to say they lose a set percentage each year, the decline can be noticeable. If you’re seeing steady increases despite regular maintenance, it may be time to consider an upgrade.

Increasing Repair Needs

As systems age, repairs become more common and often more expensive. If your AC requires two major repairs in the same year, it’s often more cost-effective to invest in a replacement. The “$5,000 rule” is a helpful guideline: multiply the age of your system by the cost of a repair. If the total is more than $5,000, replacement usually makes more sense.

Your AC Struggles to Meet Cooling Demand

In recent years, hotter summer days have pushed older and smaller ACs to their limits. Sometimes the issue is age-related decline, but in other cases the system may have been undersized when it was installed. A proper Manual J load calculation helps size your system correctly based on insulation, windows, orientation, and local climate. If your AC consistently runs without ever reaching your set temperature, or struggles during heatwaves, it could be time for a replacement—or a correctly sized system.

You're Interested in a Heat Pump

Although winters in Fullerton are mild, you still need reliable heating. Heat pumps provide both heating and cooling in one system, and they’re among the most energy-efficient HVAC options available. If you’re considering switching to a heat pump, that transition means replacing your central AC with a new system that covers your year-round comfort.

Your AC Is Loud While Operating

All ACs make some noise, but modern systems are noticeably quieter than older ones. If your unit is unusually loud, it may simply be outdated. Sudden new noises—like grinding, banging, or clicking—often signal a failing component. Addressing these noises early can prevent breakdowns, but if they persist, it may be more cost-effective to replace the system.

Unusually High Indoor Humidity

AC systems remove moisture from the air as they cool, but if your home feels unusually humid while the AC is running, it may point to trouble. While Southern California has relatively low outdoor humidity, indoor moisture can still build up due to poor ventilation, leaky ducts, or short-cycling from an oversized unit. If your AC is aging and struggling to control indoor humidity, a new system may be the solution.

Local AC Installation Experts

If you're noticing signs that it's time for a new AC, One Hour Heating & Air Conditioning® can help. We're a local HVAC company serving the residents of Fullerton. Our HVAC technicians are highly trained and have real-world experience with California cooling needs. We also offer a 100% satisfaction guarantee and our Always On Time... or You Don't Pay A Dime!® pledge. If we don’t show up when promised, your visit is free. Contact One Hour Heating & Air Conditioning® today to explore your AC replacement options and keep your home comfortable year-round.