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HomeRepair HelpGrandAire Central A/C RepairGrandAire Central air conditioner has poor temperature control Repair
GrandAire Central air conditioner has poor temperature control
When your GrandAire central air conditioner has poor temperature control, uneven cooling in the house, an AC temperature that is not accurate, or temperature swings, start with the air filter. A clogged filter restricts airflow through the furnace or air handler, reduces cooling capacity, and can cause the evaporator coil to frost over. Replace the filter at least twice a year, or more often in dusty homes or homes with pets. Next, check the wall thermostat. Failed electrical contacts can prevent the furnace or air handler and outdoor condensing unit from operating correctly or can cause intermittent cooling. A thermostat can be tested for continuity with a multimeter. Blocked or leaking vents are another common cause of an AC not holding temperature because rooms cannot receive or retain conditioned air. If the system cools quickly and shuts off before temperatures even out, the GrandAire air conditioner may be oversized, which requires professional evaluation. Enter your model number to find the exact replacement air filter, thermostat, or other part for your specific unit. Thermostat replacement is generally DIY-friendly, but shut off power first. Do not work inside the 240-volt condensing unit or sealed refrigerant system; those repairs require a licensed HVAC technician and EPA 608 certification.
01 - GrandAire 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 - GrandAire 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 - GrandAire 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 GrandAire central air conditioner have poor temperature control?
Can a thermostat cause my central air conditioner to have uneven cooling or poor temperature control?
Could a clogged air filter make my air conditioner stop blowing cold air?
How do I identify the correct GrandAire replacement part for my AC?
What should I do if my central air conditioner still has poor temperature control after replacing the filter?
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