(702) 333-8057 
It sounds backwards: a sheet of ice on your air conditioner when it is 110°F outside. But a frozen AC is one of the most common summer calls we run in Las Vegas. When the indoor evaporator coil ices over, the system can no longer pull heat out of your home, so it runs and runs while the house only gets warmer. The ice is a symptom, not the problem, and it is almost never because the unit is “too cold.” Our AC repair technicians find the actual cause, which usually comes down to airflow or refrigerant, and fix it the same day.
Why Does an AC Freeze Up When It Is 110° Outside?
A coil freezes for one of two reasons: not enough warm air is moving across it, or the refrigerant charge is low. Either way the coil drops below freezing, the humidity in the air condenses on it, and that moisture turns to ice. Here are the six causes we find most often on frozen-AC calls in the valley.
Dirty Air Filter
This is the number one cause, and the cheapest to prevent. A filter clogged with Las Vegas dust starves the coil of airflow. With little warm air passing over it, the coil gets too cold and freezes. In peak summer, check your filter monthly — a $15 filter prevents a service call.
Low Refrigerant
A low charge makes the coil colder than it should be, which causes freezing even on the hottest days. Refrigerant does not get used up, so a low charge means a leak. We locate and repair the leak, then recharge to spec — topping it off without fixing the leak just delays the next freeze-up.
Dirty Evaporator Coil
Over a few seasons the indoor coil collects a film of dust and grime that acts like a blanket. Heat transfer drops, the surface runs colder than designed, and ice forms. A professional coil cleaning restores the coil to full efficiency and is part of every tune-up we do.
Closed or Blocked Vents
Airflow has to go somewhere. Too many closed supply registers, or furniture and rugs blocking the returns, chokes the system the same way a dirty filter does. Keep most vents open and the return grilles clear so the coil always has warm air moving across it.
Failing Blower Motor
If the blower motor is weak or the wheel is caked with dust, it cannot push enough air over the coil even with a clean filter. You may notice weak airflow at the registers before the unit freezes. We test the motor and clean or replace it so airflow returns to normal.
Thermostat Set Too Low at Night
When desert temperatures drop overnight, running the AC at a very low setpoint can push an already-marginal system into a freeze. If your unit ices up only in the early morning, raising the overnight setpoint a few degrees often solves it — and points to an underlying airflow or charge issue worth checking.
What Frozen-AC Repairs Cost in Las Vegas
Most freeze-ups trace back to a handful of repairs. The ranges below reflect typical Las Vegas costs including labor; we disclose the diagnostic fee upfront before any work begins.
| Repair | Typical Cost | Notes |
|---|---|---|
| Coil cleaning | $75–$150 | Restores heat transfer; included in a full tune-up |
| Air filter / airflow correction | $0–$75 | Often just a filter change and a vent check |
| Refrigerant leak repair | $150–$600 | Depends on leak location and access |
| Refrigerant recharge | $150–$400 | Billed after the leak is repaired; varies by refrigerant type |
| Blower motor replacement | $300–$600 | OEM parts preferred for longevity in desert heat |
| Capacitor replacement | $100–$300 | If a weak capacitor is straining the blower or compressor |
If a freeze-up has already damaged the compressor on an older system, we will walk you through the repair-vs-replace math honestly. For systems past 12–15 years, a new high-efficiency installation often makes more sense, and ACE offers 36-month 0% financing with 90 days of zero payments to start.
When a Frozen AC Becomes an Emergency
A coil that thaws and runs fine afterward can usually wait for a next-day appointment. Call right away if you see any of these:
- The system keeps re-freezing within hours of thawing
- No cooling at all with the indoor temperature climbing past 85°F
- Water pooling or dripping from the indoor unit as the ice melts
- A hissing or bubbling sound, which can indicate an active refrigerant leak
- Elderly adults, young children, or pets in the home without a cool space
ACE runs 24/7 emergency service across Las Vegas, Henderson, North Las Vegas, and communities across the valley from June through September. Call (702) 333-8057 any time and we will prioritize based on heat-safety risk.
How to Keep Your Coil From Freezing
Freeze-ups are one of the most preventable failures we see. Change the filter on schedule, keep your vents and returns clear, and get a pre-season tune-up so the coil is clean and the refrigerant charge is verified before the heat arrives. Our technicians clean the coil, check the charge, test the blower and capacitor, and clear the drain line so small problems are caught in spring instead of becoming a July breakdown.
ACE offers a $49 new-customer tune-up special and a $69 standard tune-up for existing customers. Military members and veterans, along with senior residents, receive a 10% discount on all ACE services. Have questions before you book? Contact our team and we will point you the right way.
Frozen AC in Las Vegas? We Will Thaw It and Fix the Cause
Same-day service for most calls. 24/7 emergency response June through September. Free estimates on replacements. Financing at 0% interest for 36 months with 90 days of zero payments.
(702) 333-8057 — Call NowSchedule OnlineFrequently Asked Questions
How long does it take a frozen AC to thaw?
With the thermostat off and the fan set to ON, most coils thaw in two to four hours. A heavily iced system can take longer. Do not try to speed it up by chipping the ice or pointing a heat source at the coil, both of which can damage the fins or the lines. Once it is fully thawed and dry, you can test cooling again, but if it freezes a second time you need a technician.
Can I keep running my AC while it is frozen?
No. Running it in cooling mode while the coil is iced over can send liquid refrigerant back to the compressor, which is the single most expensive part of the system to replace. Switch to fan-only to thaw it, then call us. Running the fan alone will not damage anything and actually helps melt the ice.
Why does my AC freeze when it is so hot outside?
Freezing is about the coil temperature, not the outdoor temperature. When airflow is restricted or refrigerant is low, the coil drops below 32°F and the humidity in your indoor air freezes onto it, even on a 110-degree day. That is why a frozen coil in summer almost always points to a dirty filter, a dirty coil, or a refrigerant leak rather than the weather.