Common Mistakes to Avoid When Installing a New AC Unit

Installing a new air conditioning system is a significant investment that directly impacts your home’s comfort and energy efficiency. A properly installed AC unit can provide years of reliable cooling, but installation mistakes can lead to higher energy bills, poor performance, and frequent repairs.

At D-N-D Services, we specialize in professional HVAC installation in Rockwall, Dallas, Garland, and surrounding areas, ensuring your AC system operates at peak efficiency. Below are some common mistakes homeowners and inexperienced installers make when setting up a new AC unit and how to avoid them.

Choosing the Wrong Size Unit

One of the biggest mistakes in AC installation is selecting an incorrectly sized unit. Many homeowners assume that bigger is better, but an oversized system cools too quickly, leading to frequent on/off cycling, increased wear and tear, and higher energy consumption. Conversely, an undersized unit runs continuously, struggling to maintain the desired temperature, which also drives up energy costs.

Solution:

A professional HVAC technician should perform a Manual J load calculation to determine the right unit size based on:

1. Home square footage
2. Insulation levels
3. Number of windows and sun exposure
4. Local climate

Incorrect Placement of the Outdoor Unit

The location of the outdoor condenser unit plays a crucial role in the system’s efficiency. If placed in direct sunlight, near obstructions, or in poorly ventilated areas, it will work harder than necessary, leading to higher cooling costs and a shortened lifespan.

Solution:

Ensure the outdoor unit is placed in a shaded, well-ventilated area, away from debris, walls, or bushes that can block airflow. D-N-D Services carefully selects the best location for maximum efficiency and longevity.

Improper Refrigerant Levels

Refrigerant is essential for cooling, but too much or too little can cause significant issues. An undercharged system won’t cool effectively, while an overcharged system puts unnecessary strain on the compressor, leading to premature failure.

Solution:

A certified HVAC technician should correctly charge the refrigerant according to the manufacturer’s specifications. At D-N-D Services, our technicians ensure precise refrigerant levels for optimal performance.

Poor Ductwork Installation or Sealing

Leaky or poorly installed ductwork can cause up to 30% energy loss, making the system work harder than necessary. If the ducts are improperly sized, airflow will be restricted, reducing comfort and efficiency.

Solution:

A professional ductwork inspection and sealing ensures airtight connections, preventing energy loss and maintaining consistent cooling throughout your home. D-N-D Services offers duct sealing, repair, and replacement to improve airflow and efficiency.

Incorrect Thermostat Placement

The location of the thermostat directly impacts the AC unit’s performance. If installed near heat sources like windows, appliances, or vents, it can give false temperature readings, causing the AC to overwork or underperform.

Solution:

Place the thermostat in a central location, away from direct sunlight, drafts, or heat sources, ensuring accurate temperature control. Our team ensures the thermostat is correctly positioned and calibrated for maximum efficiency.

Ignoring Insulation and Home Sealing

Even a perfectly installed AC system won’t perform efficiently if your home has poor insulation or air leaks. Gaps in windows, doors, and walls allow cool air to escape, forcing the system to work harder and increase energy costs.

Solution:

Before installing a new AC unit, check insulation levels and seal air leaks around windows, doors, and attic spaces. D-N-D Services provides energy-efficient audits to ensure your home is optimized for cooling efficiency.

Skipping Professional Installation

Many homeowners attempt DIY AC installation to save money, but improper setup can lead to expensive repairs and energy waste. Even general contractors without specialized HVAC training may make errors that impact long-term efficiency.

Solution:

Always hire a licensed, NATE-certified HVAC professional like D-N-D Services. Our team follows manufacturer guidelines and local building codes to ensure a safe, efficient installation.

Not Testing the System After Installation

A new AC system should be tested thoroughly after installation to ensure proper function and efficiency. Many installers fail to check airflow, refrigerant levels, or electrical connections, leading to issues down the road.

Solution:

After installation, a professional should:

1. Test airflow and refrigerant levels
2. Check electrical connections and safety controls
3. Verify thermostat calibration
4. Ensure the system cycles properly

D-N-D Services conducts a comprehensive system check before considering the job complete.

Forgetting Routine Maintenance

Even the best AC system won’t last long without proper maintenance. Many homeowners install a new unit and forget about regular tune-ups, leading to reduced efficiency, costly repairs, and a shorter lifespan.

Solution:

Schedule annual maintenance with a trusted HVAC provider like D-N-D Services to:

1. Change air filters regularly
2. Inspect and clean coils and components
3. Check refrigerant levels and thermostat settings
4. Ensure ducts remain sealed and leak-free

Conclusion

Proper AC installation is the key to long-term energy efficiency, comfort, and system longevity. Avoiding these common mistakes can save hundreds of dollars in energy bills and prevent unnecessary repairs.

At D-N-D Services, we provide expert AC installation, maintenance, and repairs in Rockwall, Dallas, Garland, Plano, and surrounding areas. With decades of experience, we ensure every installation is done right the first time, helping you stay cool and energy-efficient year-round. Need a new AC installed? Contact D-N-D Services today for a professional, mistake-free installation!