Why pre-summer maintenance matters here
Las Vegas averages about 78 days a year over 100°F. Under that kind of sustained load, small airflow, electrical or drainage problems turn into emergencies, and desert dust, intense sun on outdoor units and monsoon debris add their own wear.
Book a tune-up between March and May. Average highs climb from about 71°F to 88°F over those months, mild enough to test the system before peak demand.
Safe checks you can do yourself
- 01Test cooling on a mild day by setting the thermostat a few degrees below room temperature and checking every vent
- 02Listen for rattling, grinding, buzzing or short cycling
- 03Check the thermostat batteries, schedule and cooling-mode response
- 04Inspect the filter and replace it if it is dirty, torn or damp, matching the size and MERV rating
- 05Open and clear every vent, and vacuum the grilles with a soft brush
- 06Shut off power at the disconnect, then clear debris and plants from around the condenser
- 07Note damaged insulation on the larger copper line for the technician
- 08Write down any rooms with weak airflow
Symptoms that need fast service
- Warm air in cooling mode
- Ice on the lines or coil
- Water leaking from the indoor unit
- Repeated shutdowns or short cycling
- Grinding or buzzing noises
- A burning smell, smoke or a breaker that keeps tripping
Resetting a tripping breaker again and again exposes damaged parts to more current. A tune-up is preventive; these symptoms call for a diagnostic visit.
Filters and indoor airflow
A clogged filter reduces airflow across the coil and can cause it to freeze. A higher MERV rating isn't automatically better: on equipment not designed for it, it can restrict airflow. Inspect monthly in homes with pets, remodeling dust or constant AC use, and expect to replace every 30 to 60 days in heavy-dust homes.
Don't close several vents to push cooling into one room. It raises duct pressure and strains the blower.
What a professional tune-up should include
- Electrical connections, capacitor and contactor tested
- Thermostat, blower, coils and condenser inspected
- Coil cleaning and a condensate drain flush
- Refrigerant assessed only when there is a reason, never topped off without finding the cause
- A written summary of findings, measurements and recommended repairs
Before approving a costly repair, ask what failed, how it affects cooling or safety, the evidence and how urgent it is, and ask for both repair and replacement options with warranty details.
Repair or replace? Two rules of thumb
The $5,000 rule multiplies the repair cost by the system's age; above $5,000, talk about replacement. The 20 rule suggests considering replacement near 20 years of age, or when a repair approaches 20 percent of the replacement cost. Both are conversation starters, not engineering standards.
