> By: The Cooling Company
Key Takeaways
- Try thermostat settings, the indoor breaker, outdoor disconnect, and the condensate float switch first.
- DIY only low-voltage tasks like batteries and filter swaps; avoid capacitors and line-voltage work.
- Expect diagnostic fees of $100–$200 and common repair ranges from $150–$700 depending on parts.
Try three quick checks first: thermostat settings, the breaker or outdoor disconnect, and the condensate float switch. Replace thermostat batteries and filters if needed. If power or strange smells persist, turn the unit off. Then call a licensed HVAC technician for safe diagnosis and repair. (ASHRAE Technical Resources)
What should you check first?
Start with safe, low-voltage checks that most homeowners can do. These steps often restore power and control without tools. Keep a notepad to record breaker behavior, thermostat reads, and any lights or smells you notice.
If these checks do not fix the problem, resist trying high-voltage repairs. Turn off power at the breaker or disconnect if you see sparks or burned parts. Calling a trained technician reduces the risk of shock and equipment damage.
Tripped breaker?
A tripped breaker is an easy fix that homeowners spot quickly. Open the main panel and look for any switch not aligned with its neighbors. Reset by switching fully OFF then ON, and watch for repeat trips which signal a bigger electrical issue.
If a breaker trips again, stop testing and write down when it happened. Repeated tripping can mean a short in the condenser, a seized motor, or a failing compressor. Those issues need an electrician or HVAC tech.
Is the outdoor disconnect off?
The outdoor condenser has a local disconnect switch or pull box nearby. Check the small metal box on the wall or post and confirm the handle is in the ON position. A pulled fuse or switch left OFF keeps the unit silent.
If the disconnect shows burn marks, melted plastic, or a missing handle, leave it OFF. Those signs mean electrical arcing or a failed contactor. Call a licensed technician for safe replacement and a full inspection.
Is the thermostat set to cool?
Incorrect thermostat mode or setpoint is a surprisingly common cause of a no-start. Make sure the thermostat is on COOL and the set temperature is below room temperature. Check for blank displays, which often mean dead batteries.
Resetting a digital thermostat after a power loss often restores settings. Try switching the mode OFF then back to COOL. If the stat is older or wiring is loose, a tech can test for proper 24V control voltage.
Need new thermostat batteries?
Many thermostats use AA or AAA batteries that fail without warning. A dim display or unresponsive buttons usually mean the batteries need replacing. Swapping batteries takes minutes and often solves control problems.
Always use fresh alkaline batteries and verify the stat shows the correct time and mode after the swap. If the display loses settings again, the thermostat or the 24V transformer may be failing and need pro testing. (ASHRAE Technical Resources)
Are control board lights showing errors?
Control boards in air handlers and condensing units often have small LED lights that flash error codes. Look for steady or blinking patterns and take a clear photo for the technician. Photos speed up diagnosis before the tech arrives.
Do not touch components inside the air handler if you are not trained. Even with the power off, capacitors can store charge. A technician will read codes with a manual or service tool and follow safe work steps.
Is the condensate switch tripped?
The condensate overflow float switch stops the compressor to avoid water damage when the drain is clogged. Check the drain pan under the air handler and remove visible debris. Reset a reachable float gently if the pan is dry afterward.
Avoid pouring liquids near electrical parts. If the switch remains tripped after clearing the pan, the float or the safety switch may be faulty and need replacement by a tech to restore reliable operation.
Why won't my AC turn on?
Many no-start problems have clear signs you can report to a technician. Electrical parts like capacitors and contactors often fail from heat and age. Mechanical failures and control faults are also common in hot climates like Las Vegas.
Some causes are quick fixes. Others need parts or full replacement. Homeowners facing repeated failures should weigh repair cost versus system age to decide whether replacement is a smarter long-term choice.
Capacitor failure symptoms?
A bad capacitor is a top reason an outdoor fan or compressor will not start. You may hear humming or clicking while the motor fails to spin. Visual signs include bulging cans or oil stains near the capacitor base.
Capacitor replacement is a high-voltage task. A trained tech will discharge the capacitor safely, test it with a meter. Replace it if it reads below spec. Expect a quick repair when the correct part is on the truck.
Start relay or contactor failure?
Contactors and relays switch high voltage to motors. Worn or welded contacts stop current flow and prevent startup. Pitted contacts can also cause overheating and arcing, which is dangerous if ignored.
Replacing a contactor is typically a same-day repair. A technician will inspect the coil, the contact surface, and the control voltage. They will also test the capacitor and motor current to confirm the root cause.
Compressor electrical issues?
Compressor motor failures are among the most expensive faults. A compressor that won’t start may show high amp draw, shorted windings, or internal mechanical damage. Diagnosis requires specialized meters and experience.
When a compressor is diagnosed as failed internally, homeowners often choose to replace the entire condenser. New units bring better efficiency and a fresh warranty. Techs can give clear cost and life-expectancy comparisons on site.
Thermostat wiring problems?
Loose, corroded, or miswired thermostat wires prevent the control signal from reaching the air handler. Small rodents or attic work can damage thermostat wires over time. Techs test for 24V at the stat and board.
Rewiring or replacing an old thermostat usually fixes control issues in under an hour. Smart stats need correct wiring and sometimes a common wire. Ask the technician to verify compatibility before installing a Wi‑Fi stat.
Control board faults?
Control boards in the air handler or condenser can fail from heat, surge, or age. Faulty boards may cause intermittent starts, fan issues, or strange behavior like random lockouts. Diagnosis takes steady troubleshooting. (ASHRAE Technical Resources)
A board replacement often restores function, but on older systems it can signal broader wear. If the board has multiple failed components, a tech may recommend evaluating whether a full system replacement is a better investment.
How much will repairs cost?
Repair cost depends on the failed part, labor time, and parts availability. Las Vegas summers drive high demand, which can push same-day labor costs up. Use these ranges as ballpark guides for budgeting.
Getting a written estimate and asking whether diagnostic fees apply helps avoid surprises. Many companies waive the diagnostic fee if they do the repair the same day, but confirm that before work begins.
Capacitor replacement cost range?
Typical capacitor replacement runs $250–$450 including parts and labor. Prices vary by capacitor type, microfarad rating, and whether the technician carries the exact part. A same-day fix is common when matched parts are available.
Older systems may need multiple capacitors or related parts. If other failures appear during service, ask for a clear parts list and cost breakdown before proceeding to avoid surprise charges.
Fan motor repair or replace cost?
Fan motor work usually ranges from $300–$700. Costs move higher for hard-to-find motors, extended labor, or motors mounted in tight spaces. Motors sometimes can be rebuilt but replacement is common on modern systems.
A technician will measure motor amperage and test bearings. If the motor seizes, it can damage the contactor or capacitor. Inspecting related parts avoids repeat visits and extra expense.
Contactor or relay replacement cost?
Replacing a contactor or relay commonly costs $150–$350. These parts are relatively low-priced and the swap is quick for a trained tech. Expect the contractor to inspect the coil and related wiring during the visit.
If you spot burn marks on the contactor, ask the tech to check the disconnect and the breaker too. Burned contacts often indicate an upstream problem that could repeat if not fixed.
Compressor replacement estimate?
Replacing a compressor can cost $1,200–$2,500 or more. Price depends on model match, refrigerant type, and labor complexity. For systems older than 10–12 years, full condenser replacement often becomes the better long-term choice.
A technician will check refrigerant type and code compliance before giving a firm quote. If the compressor requires brazing or vacuuming, expect higher labor in the estimate.
Typical diagnostic fee amounts?
Many HVAC companies charge $100–$200 for an on-site diagnostic visit. That fee often covers visual inspection, basic electrical tests, and a written estimate. Ask whether that fee is credited toward repair work.
Emergency or after-hours diagnostics usually cost more. During peak heat waves, same-day or overnight service may carry a 20–50% premium for technicians and parts priority.
When should I call a professional?
Call a technician when the issue involves high voltage, refrigerant, or repeated electrical trips. These conditions are unsafe for most homeowners. Professionals carry the tools and training needed for safe, code-compliant repairs.
Consider calling early in the heat season. Booking before the heat peaks avoids long wait times and higher emergency rates. A preventive visit often finds problems before they force a no-start on a hot day. (ASHRAE Technical Resources)
Is it unsafe to open electrical panels?
Breaker panels and contactor boxes contain live parts that can shock or electrocute you. Even with power off, capacitors may hold a charge. If you lack electrical training, do not open panels or touch wiring.
A licensed electrician or HVAC tech has personal protective equipment and safe procedures. They will test for live voltage and discharge capacitors before working on the system.
Why hire a licensed HVAC technician?
Licensed techs bring training, insurance, and certifications like EPA 608 for refrigerant work. They know local code rules and how to pull permits when needed. Hiring a licensed pro avoids unsafe shortcuts and costly mistakes.
Technicians also carry calibration tools and meters that diagnose root causes. A correct diagnosis saves money by fixing the real issue instead of swapping multiple parts that do not solve the problem.
What details should I provide a tech?
Give the technician a clear list of checks you performed and the results. Note breaker behavior, any blinking lights, odd smells, or noises. Include unit age, model numbers, and a photo of any error LEDs.
Recording when the issue started and any recent electrical work helps speed diagnosis. If you saw sparks or smelled burning, tell the tech right away so they prioritize safety checks.
How do I prevent AC failure before summer?
Preventive care makes a big difference in reliability and energy use. Scheduling a tune-up before summer reduces the risk of emergency failures and helps the system run efficiently when demand is highest.
Simple homeowner tasks also help. Replacing filters, clearing debris from the outdoor unit, and setting conservative setpoints during heat waves lower stress on the system.
How often change AC filters?
Most filters should be replaced every 1–3 months depending on use, pets, and indoor air quality. Dirty filters reduce airflow and force the system to run harder, raising energy bills and shortening component life.
Check filters visually each month during heavy use. Disposable filters that look gray or clogged need immediate replacement. For washable filters, follow manufacturer cleaning steps and allow full drying before reinstalling.
Do annual tune ups prevent failures?
Yes. Annual inspections catch worn parts, dirty coils, and low refrigerant levels early. Techs clean coils, check electrical connections, and test capacitors. These steps lower the chance of a no-start during peak heat.
Scheduling a tune-up in spring gives techs time to order parts if needed. Preventive service also improves efficiency and can extend the life of the system by several years.
Should I upgrade to a smart thermostat?
Smart thermostats can lower cooling runtime and cut monthly bills. They offer schedules, remote control, and learning modes that optimize comfort. Compatibility with older systems matters, so check wiring before buying.
A technician can confirm whether your system needs a common wire or adapter. Proper installation avoids control errors that can cause no-starts or short cycling after the stat is installed.
How to clean condenser fins safely?
Always shut off power at the outdoor disconnect before cleaning. Use a soft brush and low-pressure water from the inside out to avoid pushing debris deeper into the coils. Straighten bent fins with a fin comb handled by a pro. (ASHRAE Technical Resources)
Avoid using high-pressure washers which can damage fins. If coils are badly clogged or damaged, ask a technician for a professional cleaning or coil replacement estimate.
How to spot refrigerant leaks early?
Reduced cooling, hissing sounds near the lines, and oil stains around fittings often indicate leaks. Long run times and ice on the evaporator coil are other signs. Refrigerant work requires EPA-certified technicians.
If you suspect a leak, stop running the system and call for diagnosis. Low refrigerant can stress the compressor and lead to more costly failures if not repaired quickly.
Can zoning reduce cooling load?
Zoning splits a home into areas with separate thermostats and dampers. It directs cooling where needed and cuts runtime in unused zones. This reduces overall wear on a single system during peak summer days.
Adding zoning makes sense in larger or multi-level homes. A technician can assess duct layout and recommend a zoning setup that balances comfort and system capacity.
Need help now? Schedule service
If you are in Las Vegas, Henderson, or North Las Vegas and need fast help, call The Cooling Company at 17029308411. The company offers same-day diagnostics and repairs during peak season. They service local homes and know the NV Energy peak patterns.
Out-of-area readers should ask for NATE-certified technicians and request local referrals. When calling any contractor, ask about diagnostic fees, warranty terms, and parts availability to avoid surprises.
What to expect during a service visit?
A technician from The Cooling Company will inspect power, controls, and the outdoor unit. They will run safe electrical tests and evaluate capacitors, contactors, and motors. Expect a written estimate before work begins and a clear explanation of same-day options if available.
Techs will also check for NV Energy rebate eligibility on upgrades. If a replacement is recommended, they can explain efficiency gains, rebate options, and typical payback timelines.
How to book service now?
Call The Cooling Company at 17029308411 for service in Las Vegas, Henderson, or North Las Vegas. Have your unit model and age ready, along with notes on checks you already performed. Booking details and arrival windows are confirmed when you call.
If you live outside the service area, ask contractors for NATE certification and for references from recent local jobs. That ensures trained techs handle your system and follow best practices.
Quick checklist before you call
Before the technician arrives, write a short checklist of what you tried. Note thermostat mode, breaker resets, battery changes, filter status, and any lights or smells. Photos of control board LEDs and the outdoor disconnect help the tech prepare.
Having this information saves time and reduces diagnostic cost. A clear checklist helps the technician target likely causes and often speeds the repair so you get cooling back faster.
Final tips and reminders
Keep spare thermostat batteries and a few replacement filters on hand before summer. Regular filter changes and a spring tune-up prevent many no-start situations. Planning service ahead avoids high emergency rates and long waits.
If you smell burning, see sparks, or notice melted wiring, shut off power and call for immediate service. The Cooling Company can dispatch trained technicians in Las Vegas, Henderson. North Las Vegas to handle urgent electrical HVAC hazards safely.
About The Cooling Company
The Cooling Company has been serving the Las Vegas valley with professional HVAC services for over a decade. Our team of licensed, NATE-certified technicians specializes in air conditioning repair, heating system maintenance, and complete HVAC installations. We're committed to providing honest, reliable service with upfront pricing and a 100% satisfaction guarantee on all work performed.
- Phone: (702) 930-8411
- Reviews: 4.9/5 stars (500 reviews) - See reviews
Service Areas
We proudly serve homeowners and businesses throughout the Las Vegas metropolitan area, including Las Vegas, Henderson, and North Las Vegas. Our service technicians are available for same-day appointments in most areas, with emergency service available 24/7 for urgent HVAC issues.