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HomeRepair HelpCentral A/C RepairCentral air conditioner has poor temperature control Repair
Central air conditioner has poor temperature control
When a central air conditioner has poor temperature control, uneven cooling, or the AC temperature is not accurate, start with the air filter. A dirty or clogged air filter restricts airflow through the furnace or air handler, reduces cooling capacity, and can frost the evaporator coil, leaving the AC not holding temperature. Next, check the wall thermostat, which uses electrical contacts to control the furnace or air handler and condensing unit. A failing thermostat can cause intermittent operation or an air conditioner that does not maintain the set temperature. A wall thermostat can develop the same problem. Also inspect the filter again if needed, then check for blocked or leaking vents that prevent conditioned air from reaching some rooms. If the system cools quickly and shuts off before temperatures even out, the air conditioner may be oversized, which usually requires an HVAC professional to evaluate. Enter your model number to find the exact replacement air filter, thermostat, or wall thermostat for your central air conditioner. Filter replacement and vent checks are generally DIY repairs, but shut off power before servicing; leave 240-volt electrical testing or sealed-system work to a qualified technician.
01 - Central Air Conditioner Air Filter
Check and replace the air filter at least twice a year, more often in dusty/dirty environments or if there is a pet in the home. A clogged air filter will greatly reduce the air flow of the furnace or air handler which can result in poor temperature control when trying to heat or cool the home.
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Highly Likely
02 - Central Air Conditioner Wall Thermostat
The wall thermostat has electrical contacts that control the power supply to the furnace or air handler and condensing unit. If the contacts in the thermostat fail, certain components of the cooling system may not work or may only work intermittently. To determine if the thermostat is defective, use a multimeter to test it for continuity. If the wall thermostat does not show proper continuity, replace it.
Common
03 - Central Air Conditioner Wifi Thermostat
The WiFi thermostat has electrical contacts that control the power supply to the furnace or air handler and condensing unit . If the contacts in the thermostat fail, certain components of the cooling system may not work or may only work intermittently. To determine if the thermostat is defective, use a multimeter to test it for continuity. If the WiFi thermostat does not show proper continuity, replace it.
Common
04 - Clogged Air Filter
If the air filter is clogged, air cannot flow properly through the home's venting system. This greatly reduces the cooling capacity of the air conditioner. In addition, if the air filter is clogged, the evaporator coils will frost over and not be able to remove moisture from the air. The air filter should be checked and replaced at least twice a year, more often in dusty/dirty environments. Refer to owner's manual for guidance.
Less Common
05 - Blocked or leaking vents
The furnace or air handler must have good airflow to work properly. A blocked or leaking vent can prevent good air flow and cause inconsistent room temperatures.
Less Common
06 - Oversized air conditioner
An oversized furnace or air handler will quickly heat or cool the home and shut off. This causes acceptable temperatures in certain areas but not in others. The circulated air needs time to distribute evenly throughout the home; the air recirculating through the furnace or air handler for longer periods of time will produce better results.
Less Common
Frequently Asked Questions
Why does my central air conditioner have poor temperature control?
Can a clogged air filter cause uneven cooling and weak airflow from AC vents?
How do I know if my central air thermostat is not working?
Why is my home AC not cooling each room evenly?
How do I find the correct central air conditioner replacement part?
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