Quick Answer:

Wednesday was 94 degrees in Las Vegas. That is the hottest March day ever recorded here, and Thursday was hotter. Your AC has not run since October. First run of the season in near-100 degree heat is exactly when things fail. Check your filter, clear your condenser, and listen for the first 10 minutes before you walk away.

It's 97 Degrees in March and Your AC Has Been Off Since October

Wednesday hit 94. Thursday was worse. The all-time March record in Las Vegas is gone, and it will probably get broken again before Sunday.

The RJ ran the weather story. Tourists on Fremont Street, stay hydrated, here are some fun facts about historic temperatures. Fine. But if you own a house in this valley the story that matters is not the thermometer reading. It is the unit sitting in your backyard that has not run since October. AC maintenance in Las Vegas is not a fall task. This week is proving it is a year-round concern.

Five months. That is how long your AC has been off. Dust on the coils. The condensate drain line sitting dry. The capacitor that has been baking in a backyard through winter. Now you are going to ask it to hold 76 degrees inside when it is 97 outside and run it basically nonstop for four days straight.

That is how you end up making a phone call on Saturday afternoon that costs $400 before anyone even looks at anything.

Residential AC condenser unit on exterior wall in direct sunlight

Five months of sitting. Now 97 degrees. This is the week units fail.

The capacitor problem

Most people have never heard of a capacitor until theirs dies. It is a small cylinder inside the unit, costs maybe $20 in parts, and its job is to give the compressor motor enough of a kick to start. Capacitors wear out faster when they sit in heat, and a Las Vegas backyard gets hot even in winter.

When a capacitor is starting to go you will hear it. The unit hums, tries to start, shuts off, tries again. Sometimes it starts fine but draws too much current doing it, which stresses the compressor. Ignore that for a few days and the repair goes from $150 to $1,500.

Call on a Friday during business hours and you are paying normal rates. Call Saturday afternoon during a heat wave and you are paying emergency weekend rates, and you are probably third or fourth in line because every other homeowner in the valley is doing the same thing.

The one nobody thinks about until their ceiling is wet

Your AC pulls humidity out of the air and that water drains somewhere. Usually out through a line in the side of your house or into a utility sink. That line has been sitting dry since October collecting dust and whatever else. First week of hard running, condensate production goes way up. A partially clogged line backs up. The pan fills. Overflows.

It comes through your ceiling or your wall and it looks exactly like a roof leak.

It is not a roof leak. But by the time you figure that out you have been mopping up water for a day and the drywall is already wet. In Las Vegas you have maybe 48 hours before mold starts in a wall cavity. The desert dries surfaces fast but traps moisture inside.

If that does happen this weekend, VegasRebuild has a vetted contractor list for exactly this situation: companies that are actually licensed and IICRC certified, not whoever answers the phone at 10pm on a Saturday.

Water stain on ceiling from AC condensate overflow

Condensate overflow. Looks like a roof leak. Is not a roof leak. You have 48 hours before it becomes a mold problem.

What to actually do right now

Go outside and look at your condenser. If there is junk piled up around it from winter (dead palm fronds, leaves, whatever blew in), clear it. The unit needs airflow on all sides. A gentle rinse with the hose to knock the dust off the fins takes two minutes and is worth doing.

Check your air filter inside. If you cannot remember the last time you changed it, change it now. A clogged filter makes the system work harder and can cause the evaporator coil to ice over, which will confuse you because your house is hot and there is literally ice forming on your AC.

When you turn it on today, set it to 78 first. Not 70. Let it run at a reasonable setting for the first 30 minutes and listen. Grinding, squealing, or a unit that starts and stops every few minutes, turn it off and call someone while it is still Friday.

If it runs fine, great. Drop the temp gradually. Do not ask a system that has been sitting since October to immediately bridge a 27 degree gap on its first day back.

East Las Vegas gets the worst of it

If you are in the 89110, 89115, or 89101 zip codes your unit is running harder than the same unit would in Summerlin or Centennial Hills. East Las Vegas runs a few degrees hotter consistently: lower elevation, denser built environment, less of the elevation relief the west side gets. Your AC is already working against a harder baseline.

Cooling centers if yours fails

Clark County opened cooling stations Thursday through Saturday. Full list at helphopehome.org. This is for everyone, not just people in crisis. If your unit goes out this weekend and you are waiting on a tech, these are real options.

Library branches across the valley are open. East Las Vegas Family Park on Charleston opened the splash pads early this week. If you have kids and the house is climbing toward 85, that is a legitimate Saturday afternoon plan.

April is When You Fix This Properly

AC maintenance in Las Vegas should happen in April, not June. If your unit is more than 10 years old and you have not had anyone look at it since last summer, do not wait. Get it serviced when this heat breaks and rates are still normal. The good HVAC companies here book out weeks ahead once summer officially arrives. A tune-up in April runs $80 to $150. Finding out your compressor is failing in April means you have time to get quotes and schedule a replacement. Finding out in July means you are sleeping in a hotel while you wait for availability.

Las Vegas has always had brutal summers, but AC maintenance here is increasingly a spring issue too. January was the fifth warmest on record, February was the second warmest since 1937, and we are hitting 97 in March. The season is getting longer. If your house was built during the 2000s construction boom (and a lot of valley homes were), the systems are getting old. This week is a reasonable moment to pay attention to that.

Related:

FAQ

Is 94 degrees in March actually unusual for Las Vegas?

The normal high in mid-March here is around 72. The previous all-time March record was 93, set in 2022. Wednesday broke it and Thursday is expected to go higher. The earliest 100 degree day ever recorded in Las Vegas was May 1, 1947. What is happening this week is not a little early. It is two months early.

Where are the cooling centers this weekend?

Clark County cooling stations are open Thursday through Saturday at library branches, recreation centers, senior centers, and The Salvation Army. Full list at helphopehome.org. Open to everyone.

My AC is making a grinding noise. Do I turn it off?

Yes. Turn it off at the thermostat. Grinding usually means a bearing in the motor is going. Running it through that sound is how a $200 repair becomes a compressor replacement. Call today while it is still Friday and you are on normal rates.

Water is dripping from my ceiling and I think it is the AC. What do I do?

Turn the AC off at the thermostat first. The condensate drain line is almost certainly clogged. You can try clearing it yourself with a wet-dry vac on the exterior drain port. If the ceiling is already wet you need to dry it out fast; in Las Vegas you have roughly 48 hours before mold starts inside the wall. If there is significant water get someone out quickly. Our water damage guide covers the first 48 hours, and VegasRebuild has vetted local contractors for water damage situations.

Will it cool down after this weekend?

Into the mid-80s next week, which is still well above the March normal of 72. The valley is tracking toward its warmest winter on record. This is not the last of it.