Living in Las Vegas means dealing with triple-digit heat for several months of the year. As such, having a properly functioning air conditioning system isn’t just a comfort—it’s a necessity. But what many homeowners don’t realize is that even the most advanced AC unit can fall short if it isn’t installed correctly. In fact, poor AC installation is one of the leading causes of system inefficiency, premature breakdowns, and soaring energy bills.
At Air Pro Master, we’ve seen firsthand the costly consequences of improper installation. To help you avoid those issues, we’ve put together a list of the most common AC installation mistakes Las Vegas homeowners should steer clear of—and what to do instead.
1. Choosing the Wrong Size AC Unit
One of the most common mistakes in AC installation is selecting a system that’s either too large or too small for the space it’s meant to cool. A unit that’s too big will cycle on and off too frequently, failing to dehumidify your home properly and increasing wear and tear. On the other hand, a system that’s too small will constantly run, trying (and failing) to keep up with the demand.
How to Avoid It:
A licensed HVAC specialist will conduct a full load calculation, factoring in square footage, insulation levels, number of windows, sun exposure, and more to determine the ideal unit size for your Las Vegas home.
2. Poor Ductwork Design and Installation
Even if you choose the right unit, your AC system won’t perform well if your ductwork is poorly designed or installed. Leaky or improperly sealed ducts can reduce system efficiency by up to 30%, leaving some rooms hotter than others and overworking your unit.
How to Avoid It:
Ensure that your HVAC contractor checks for duct integrity, uses quality materials, and seals all joints to avoid air leaks. In many older Las Vegas homes, ductwork upgrades may be necessary during a new AC installation.
3. Ignoring Insulation and Sealing
Las Vegas may be known for its heat, but homeowners often overlook the importance of proper insulation during an AC installation. Without good insulation and sealed air leaks, cool air escapes, forcing your system to work harder than necessary.
How to Avoid It:
Before installing a new unit, inspect your attic, walls, and windows for proper insulation. Ask your HVAC specialist to recommend weather-stripping, sealing, or insulation improvements as part of your system upgrade.
4. Skipping the Permits and Inspections
Las Vegas homeowners are sometimes tempted to skip permits and inspections to save time or money. However, this can backfire significantly. Failing to obtain the proper permits can lead to code violations, safety hazards, and even problems selling your home in the future.
How to Avoid It:
Always work with a licensed HVAC contractor who is familiar with Las Vegas building codes and takes responsibility for securing the necessary permits and arranging inspections.
5. Incorrect Thermostat Placement
It may seem like a small detail, but thermostat placement has a big impact on how well your system runs. If it’s placed in direct sunlight or near vents or appliances, it can give false readings and cause your AC to run inefficiently.
How to Avoid It:
A professional AC installation includes strategic thermostat placement—typically on an interior wall away from sunlight and drafts. Make sure your technician is mindful of this during setup.
6. Not Checking Refrigerant Levels
Incorrect refrigerant charge during AC installation is another common issue that can lead to system inefficiency or even damage. Too much refrigerant can cause high pressure in the system, while too little can result in poor cooling performance.
How to Avoid It:
Refrigerant levels must be carefully calibrated based on the manufacturer’s specifications and your specific system setup. Trust only a certified HVAC specialist who knows how to properly charge and test refrigerant.
7. Failing to Test the System Post-Installation
A thorough post-installation inspection is essential to ensure that everything is working as it should. Unfortunately, some less-reputable contractors rush the job and skip vital performance checks.
How to Avoid It:
Insist on a complete performance test, including airflow measurement, thermostat calibration, and verification of refrigerant levels. A professional HVAC contractor will also check the system’s safety controls before completing the job.
8. Ignoring Manufacturer Guidelines
Every AC unit comes with specific installation guidelines that must be followed to maintain the warranty and ensure proper operation. Cutting corners can void your warranty and result in costly repairs.
How to Avoid It:
Hire a contractor experienced with your unit’s brand and model who adheres strictly to manufacturer requirements during every stage of the AC installation.
9. Poor Drainage Setup
Las Vegas is dry, but your AC system still produces condensate that must be properly drained. Inadequate drainage setups can lead to water damage, mold growth, and poor indoor air quality.
How to Avoid It:
Your HVAC specialist should install a correctly sloped drainage line with a trap and cleanout. Drain pans and overflow shut-off switches should also be part of the setup to avoid accidents.
10. Skipping AC Maintenance After Installation
Even if your AC installation is flawless, skipping regular maintenance can lead to early system failure. Las Vegas summers push AC systems to their limits, making routine checks essential for performance and longevity.
How to Avoid It:
Schedule annual or bi-annual AC maintenance with a trusted HVAC specialist to clean coils, check refrigerant levels, and inspect components. Preventative care reduces breakdowns and keeps your system efficient all year long.
Why Local Experience Matters in Las Vegas
The desert climate in Las Vegas presents unique challenges that not every contractor understands. From high dust levels to extreme temperatures, your AC installation needs to be done with local conditions in mind. That’s why hiring a contractor familiar with local regulations, home construction styles, and environmental factors is key.
We work with homeowners and contractors across regions to ensure every AC installation project follows industry best practices—no matter where you are.
#1 Las Vegas HVAC Contractor
An improperly installed AC system can cost you more in energy bills, repairs, and discomfort than you might expect. If you’re a Las Vegas homeowner planning a new AC installation, be sure to avoid these common pitfalls by working with a reputable, experienced HVAC contractor.
We hope this article helped you gain some insight into how to approach your AC installation in Las Vegas. If you have questions, need a second opinion, or want to connect with a team that prioritizes quality, transparency, and long-term value, message Air Pro Master. We’re proud to be a trusted name in professional AC installation and HVAC services—bringing our expertise to homeowners like you.
Let us help you make your home a cool, comfortable escape from the Las Vegas heat—done right the first time.
Air Pro Master Air Conditioning Repair & Installation
2139 S Industrial Rd, Las Vegas, NV 89102
(702) 935-5622