When your central air conditioner is running and producing some cool air but not cooling down your home, check the air filter. A dirty air filter won’t allow air to flow through the evaporator in your air conditioner and the air vents in your home properly. Replace the air filter if it’s dirty.
If replacing the air filter doesn’t restore proper cooling, then check for blocked air flow through the condenser unit outside your home. The condenser coils cool down hot, compressed refrigerant before the refrigerant enters the evaporator. If condenser coils are blocked or clogged with dirt and debris, then the central AC won’t cool very well. Clear grass and vegetation from around the condenser. Have a service technician clean the condenser coils if they’re clogged with dirt and debris.
If these tips don’t help restore cooling capacity to your HVAC system, then low refrigerant charge, a faulty compressor or clogged evaporator could be preventing the central air conditioner from cooling properly.