Announcement: LB Chase Earns Industry-Leading NPS® Score in Customer Satisfaction.
LB Chase Heating & Air
Justin Wood, General Manager
Email Justin: GM@LBchase.com
Rated 4.9 on 
(393 Reviews)
AC Freezing Up - Lead Funnel
LB Chase is Rated 4.9 on and Received an Industry Leading NPS® Score in Customer Satisfaction
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About Our AC Freezing Up Service Appointments
Justin Wood, General Manager
Email me: GM@LBchase.com
When your AC freezes up, it usually means the system is not moving enough warm air across the indoor coil or the refrigerant pressure is not where it should be. Common causes include a dirty air filter, blocked airflow, a frozen evaporator coil, low refrigerant, a refrigerant leak, a dirty coil, blower motor issues, or a thermostat problem.
If you see ice on your indoor unit, outdoor refrigerant line, or copper line, turn the cooling system off and let the ice thaw before the appointment. You can switch the thermostat fan setting to “On” to help move air through the system, but avoid continuing to run the AC while it is frozen. Running a frozen system can put unnecessary stress on the compressor.
After you complete the short form above, an LB Chase comfort advisor will contact you within 1–2 hours during normal business hours to help schedule your appointment. Our technician will inspect your filter, airflow, indoor coil, blower motor, refrigerant pressures, drain system, outdoor unit, and thermostat operation to find out why the system froze.
We will explain what we find in plain language, review your repair options, and help you choose the right next step. If the issue is simple, we will tell you. If the system is older, leaking refrigerant, or becoming unreliable, we can also walk you through replacement options without pressure.
LB Chase Heating & Air has served Sevierville, Maryville, Seymour, Kodak, Pigeon Forge, and surrounding East Tennessee communities since 1995. Our goal is to get your home cooling again with honest diagnostics, clear communication, and no-pressure recommendations.
Frequently asked questions about why your AC is freezing up
Why is my AC freezing up?
Your AC is usually freezing up because of restricted airflow or a refrigerant problem. Common causes include a dirty air filter, blocked vents, dirty evaporator coil, weak blower motor, low refrigerant, or a refrigerant leak. Trane lists airflow restriction and low refrigerant among the common causes of frozen evaporator coils.
What should I do if my AC is frozen?
Turn the cooling system off at the thermostat and let the ice thaw. You can set the fan to “On” to help move warm air across the frozen coil, but do not keep running the AC in cooling mode while it is frozen. Trane and Lennox both recommend shutting off cooling and allowing the system to defrost.
Can a dirty air filter cause my AC to freeze?
Yes. A dirty air filter can restrict airflow across the evaporator coil. When not enough warm air moves across the coil, the coil can get too cold and freeze. Carrier notes that replacing a dirty filter can improve airflow and help prevent future freezing.
Why is the copper line or outside AC line frozen?
A frozen copper line often means the indoor evaporator coil is frozen too. This can happen because of low airflow, low refrigerant, a refrigerant leak, dirty coils, or blower problems. The line freezes because refrigerant temperatures drop too low and ice forms on the coil or line.
Is it safe to run my AC while it is frozen?
No. Running the AC while frozen can keep building ice and may put stress on the compressor. Carrier says a frozen air conditioner should be turned off immediately to allow the ice to thaw and help prevent further damage.
How long does it take a frozen AC to thaw?
A frozen AC may take a few hours to thaw, and severe ice buildup may take longer. Strada Services notes that some systems can thaw in a few hours, while others may need to stay off for up to 24 hours.
Why does my AC keep freezing up after I thaw it?
If your AC freezes again after thawing, the underlying problem has not been fixed. Recurring freezing often points to restricted airflow, low refrigerant, a refrigerant leak, dirty coils, a weak blower motor, or another mechanical issue. Carrier notes that a frozen AC requires attention and the root cause should be diagnosed and repaired.
Should I call an HVAC technician for a frozen AC?
Yes, especially if the system freezes again, the filter is clean, airflow seems weak, the copper line is iced over, or the system is not cooling after it thaws. Refrigerant leaks, blower problems, dirty coils, electrical issues, and compressor-related problems should be diagnosed by a qualified HVAC technician.