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HomeRepair HelpBroan Central A/C RepairBroan Central air conditioner has poor temperature control Repair
Broan Central air conditioner has poor temperature control
When your Broan central air conditioner has poor temperature control, the most likely cause is a dirty or clogged air filter restricting airflow through the furnace or air handler. Replace the air filter as recommended, especially if you have pets or a dusty home. A failed wall thermostat is the next likely cause; worn electrical contacts can make the system cycle incorrectly, causing inaccurate AC temperature readings or uneven cooling. A multimeter continuity test can help identify a defective thermostat. Blocked, leaking, or poorly positioned vents can also create weak airflow and room-to-room temperature differences. If the air conditioner is oversized, it may cool the home too quickly and shut off before air circulates evenly, leaving the AC not holding temperature. Check these airflow and control parts before suspecting sealed-system problems. Replaceable filters, thermostats, and vent components are reasonable DIY repairs, but shut off power before servicing. Do not open the condensing unit, work on 240-volt components, or handle refrigerant; electrical repairs and any sealed-system diagnosis require a qualified HVAC technician, with refrigerant work requiring EPA 608 certification. Enter your Broan model number to find the exact replacement part for your central air conditioner.
01 - Broan 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 - Broan 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 - Broan 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 Broan central air conditioner have poor temperature control?
Can a thermostat cause my central air conditioner to have uneven cooling or not hold temperature?
Can a clogged air filter make my air conditioner freeze up or stop cooling properly?
Could an oversized central air conditioner cause poor temperature control?
How do I find the correct Broan central air conditioner part for my repair?
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