When the summer heat hits, a reliable air conditioner is your best friend. But what happens when that brand-new AC system doesn’t work as efficiently as you expected—or worse, starts causing problems from day one? The truth is, many homeowners end up paying thousands of dollars in repairs or replacements due to common AC installation mistakes.
A poorly installed air conditioning system can lead to skyrocketing energy bills, frequent breakdowns, and even a shortened lifespan for your unit. The good news? These costly mistakes are entirely avoidable—if you know what to look out for.
Here are some of the most common AC installation mistakes and how you can avoid turning your cooling investment into a financial nightmare.
Another critical aspect to consider is the importance of regular maintenance and timely repairs. Neglecting these can lead to inefficiencies and costly breakdowns. If you’re unsure where to begin with maintenance or suspect your system needs professional attention, start here to find expert guidance and services tailored to your needs. By addressing potential issues early, you can prevent minor problems from escalating into major expenses, ensuring your air conditioning system operates smoothly and efficiently throughout its lifespan. Remember, proactive care is key to avoiding unnecessary costs and extending the life of your unit.
Table of Contents
1. Choosing the Wrong Size Unit
Bigger Isn’t Always Better—And Smaller Isn’t Cheaper
One of the most expensive AC installation mistakes homeowners make is choosing the wrong size unit. Many assume that bigger is better, believing a larger system will cool their home faster. Others think they can save money by purchasing a smaller unit. Both approaches can backfire.
- Too large? Your AC will cool too quickly, causing short-cycling. This means it turns on and off frequently, leading to unnecessary wear and tear and higher energy bills.
- Too small? It will constantly run, struggling to reach the desired temperature, leading to inefficient cooling and higher energy costs.
How to Avoid This Mistake
Professional HVAC installers perform a Manual J Load Calculation, which considers your home’s size, insulation, number of windows, and climate to determine the perfect AC size for your needs. Never rely on guesswork when purchasing an AC unit!
2. Poor Placement of the AC Unit
Where You Put Your AC Matters More Than You Think
Think you can just install your AC anywhere? Think again. The placement of your unit affects efficiency, airflow, and longevity.
- If placed in direct sunlight, your AC will work twice as hard to cool your home, leading to increased energy use and premature system failure.
- If placed near obstructions like bushes or walls, airflow will be restricted, making the system overheat and reduce efficiency.
- If installed too close to windows or bedrooms, noise levels can become a major nuisance.
How to Avoid This Mistake
Ensure your outdoor unit is placed in a shaded, well-ventilated area with at least two feet of clearance on all sides. A professional installer will help find the optimal location for maximum performance.
3. Skipping Proper Ductwork Inspection
Leaky Ducts Can Drain Your Wallet
Even if you buy the best AC unit on the market, it won’t matter if your ductwork is a mess. Leaky or poorly designed ducts can result in up to 30% energy loss, forcing your AC to work harder than necessary.
Signs of Bad Ductwork Installation
- Uneven cooling in different rooms
- Increased dust and allergens
- Higher-than-normal energy bills
How to Avoid This Mistake
A professional installer will inspect your ducts for leaks, blockages, and poor connections before installing your AC unit. If your ducts are old or damaged, sealing and repairing them can dramatically improve efficiency and comfort.
4. Ignoring the Refrigerant Charge
Too Much or Too Little Refrigerant Can Be a Costly Disaster
Refrigerant is what makes your AC cool the air, but getting the charge right is crucial. Too much or too little can cause expensive system failures.
- Overcharging can lead to compressor failure, which is one of the most expensive AC repairs.
- Undercharging makes the AC work harder, reducing efficiency and leading to higher energy costs.
How to Avoid This Mistake
A professional HVAC technician will measure and charge the refrigerant according to the manufacturer’s specifications. Never let an unqualified person “top off” your refrigerant without checking for leaks first!
5. Incorrect Thermostat Placement
Your Thermostat Could Be Sabotaging Your Comfort
Your thermostat tells your AC when to turn on and off, so where it’s placed matters. If installed in the wrong spot, your AC might short cycle, run excessively, or fail to cool your home properly.
Bad Thermostat Placement Examples
- Near windows or vents, causing inaccurate temperature readings.
- In direct sunlight, making your AC think it’s hotter than it actually is.
- Too far from commonly used rooms, causing discomfort in key areas.
How to Avoid This Mistake
Ensure your thermostat is installed in a central location, away from heat sources, drafts, and direct sunlight, for the most accurate temperature control.
6. Forgetting to Check Airflow and Ventilation
Blocked Vents and Poor Airflow Can Kill Your AC
Even a perfectly installed AC won’t work efficiently if airflow is restricted. Poor airflow can strain your system, increase energy bills, and lead to premature breakdowns.
Common Causes of Poor Airflow
- Blocked return vents by furniture or curtains.
- Dirty air filters, restricting airflow and overworking the system.
- Closed or obstructed supply vents, leading to uneven cooling.
How to Avoid This Mistake
- Keep all vents clear and unblocked.
- Change air filters regularly (every 1-3 months).
- Have an HVAC professional check for airflow issues before completing installation.
7. Hiring an Unqualified or Inexperienced Installer
A Bad Installation Can Cost You Thousands
At the end of the day, the biggest mistake homeowners make is hiring the wrong installer. A poorly installed AC system will result in constant repairs, high energy bills, and an early system replacement—all of which cost thousands.
How to Avoid This Mistake
- Hire a licensed, insured, and experienced HVAC professional.
- Read reviews and testimonials before choosing an installer.
- Get a detailed estimate and ask about their installation process.
Don’t Risk Costly AC Mistakes—Trust the Experts
Your AC is a major investment, and avoiding these common installation mistakes will save you money, improve efficiency, and extend the life of your system.
When it comes to professional AC installation, don’t cut corners. Trust the experts at Elite Air & Heat LLC to install your AC the right way the first time. Their team of certified HVAC professionals ensures your system is properly sized, placed, and installed for maximum efficiency and long-term reliability.
Contact Elite Air & Heat LLC today to schedule your AC installation and keep your home cool without the costly mistakes!
