Unlock the Right Part
for Your Repair
Find the exact part you need
Enter your model number to see parts that fit your machine.
Price Match Guarantee
In-stock parts ship the same day
365-Day Return Policy
Price Match GuaranteeChoose Product
Identify Problem
03
Find Solutions
HomeRepair HelpTempstar Central A/C RepairTempstar Central air conditioner has poor temperature control Repair
Tempstar Central air conditioner has poor temperature control
If your Tempstar central air conditioner has poor temperature control, the most likely cause is a clogged air filter. Restricted airflow through the furnace or air handler can reduce cooling capacity, cause the evaporator coil to frost over, and leave your home with uneven cooling or an AC not holding temperature. 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 make the condensing unit or air handler operate intermittently, causing inaccurate AC temperature readings and room-to-room temperature swings. A multimeter can test thermostat continuity, but turn off power before servicing and leave any 240-volt wiring or line-voltage work to a qualified technician. Blocked or leaking vents are another possible cause because the furnace or air handler cannot distribute conditioned air evenly. Finally, an oversized air conditioner may cool too quickly and shut off before air circulates throughout the home. Enter your Tempstar model number to find the exact replacement air filter, thermostat, or other compatible part for your central air conditioner.
01 - Tempstar 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.
Enter model number to search for the required part specific to your product
Highly Likely
02 - Tempstar 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 - Tempstar 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 Tempstar central air conditioner have poor temperature control or uneven cooling?
Can a clogged air filter cause my central air conditioner to stop holding temperature?
How do I test a Tempstar thermostat that is not controlling the AC correctly?
Could an oversized central air conditioner cause poor temperature control?
How do I find the correct Tempstar replacement part for my air conditioner?
Shop by Tempstar Central Air Conditioner Parts
Our Story
Family-owned and operated since 1912, Burke America Parts Group is the longest-running genuine appliance, HVAC, and outdoor power equipment parts solution in North America. At Repair Clinic, we're proud to be an international brand trusted by the pros as well as the DIY community.
About Repair Clinic
© 2026 RepairClinic.com