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HomeRepair HelpColeman Central A/C RepairColeman Central air conditioner has poor temperature control Repair
Coleman Central air conditioner has poor temperature control
If your Coleman central air conditioner has poor temperature control, the air conditioner may have an inaccurate temperature, fail to hold the set temperature, or cause uneven cooling in the house. Start with the air filter, the most likely cause. A dirty or clogged filter restricts airflow through the furnace or air handler, reduces cooling capacity, and can cause the evaporator coil to frost over. Next, check the wall thermostat. Failed electrical contacts can make the furnace or air handler and condensing unit operate intermittently, leading to AC temperature swings. Use a multimeter to test thermostat continuity only after shutting off power. Blocked or leaking vents can also create weak airflow and room-to-room temperature differences. Finally, an oversized air conditioner may cool too quickly and shut off before air circulates evenly, which usually requires an HVAC professional to evaluate. Check and replace the air filter or inspect accessible vents yourself, but leave 240-volt condensing unit wiring and other line-voltage work to a qualified technician. Enter your Coleman model number to find the exact air filter, wall thermostat, wall thermostat, or other replacement part for your central air conditioner.
01 - Coleman 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 - Coleman 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 - Coleman 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 Coleman central air conditioner have poor temperature control?
Can a clogged air filter cause uneven cooling or weak airflow from AC vents?
How do I test a Coleman wall thermostat that is not holding the temperature?
What should I do if my central air conditioner cools quickly but the house still has uneven temperatures?
How do I find the correct Coleman central air conditioner replacement part?
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