Installing a new air conditioning system is a major step in improving your home’s comfort and energy efficiency. However, the process isn’t as simple as just setting up the unit and flipping a switch. If done incorrectly, AC installation can lead to long-term issues that are expensive, frustrating, and even dangerous. At Shellaby A/C & Refrigeration, we’ve seen first-hand how AC installation mistakes can cause energy loss, reduced system performance, and premature breakdowns.
To help you make informed decisions, we’ve outlined the most common AC installation mistakes homeowners make—and how you can avoid them by working with a professional HVAC technician.
Why AC Installation Must Be Done Right the First Time
A new AC system is a long-term investment. Whether you’re upgrading your current unit or installing one in a new property, proper installation ensures optimal performance, energy efficiency, and durability. On the other hand, cutting corners or choosing the wrong installer can result in uneven cooling, rising utility bills, and a shorter system lifespan.
Residential air conditioners are designed to operate under very specific conditions. Without careful planning, calculation, and precision, even a high-end unit won’t function as intended. That’s why Shellaby A/C & Refrigeration takes a comprehensive approach to every installation—we consider your home’s layout, insulation, ductwork, and local climate to deliver a cooling solution that actually works.
Installing the Wrong Size Unit
One of the biggest issues we encounter is improperly sized systems. Many homeowners assume that a larger air conditioner will cool their home faster, but that’s not how AC systems work. An oversized unit will cycle on and off too frequently, never reaching peak efficiency or properly dehumidifying the air. An undersized unit, meanwhile, will run constantly, struggling to maintain a comfortable temperature while driving up your energy bills.
At Shellaby A/C & Refrigeration, we perform detailed load calculations to determine the correct size based on your home’s square footage, insulation, windows, and more. This ensures you get the right capacity AC system for your needs—not too big, not too small.
Poor Ductwork Planning
Even the best air conditioner can’t perform well with badly designed or leaking ductwork. If your ducts are undersized, damaged, or poorly connected, air won’t distribute evenly throughout your home. This can result in hot and cold spots, reduced airflow, and wasted energy.
Unfortunately, many installers skip duct inspections or assume existing ductwork is sufficient. At Shellaby A/C & Refrigeration, we inspect and assess your duct system to make sure it supports the demands of your new AC unit. We also check for leaks, blockages, and insulation issues that could impact performance.
Incorrect Thermostat Placement
A thermostat controls when your air conditioner turns on and off, so its location is critical. Placing it near a window, in direct sunlight, or close to appliances can skew the temperature reading, causing the system to overwork or underperform.
As experienced HVAC professionals, we ensure your thermostat is installed in a central, shaded location that accurately reflects your home’s ambient temperature. This small but essential step ensures balanced comfort throughout your home.
Skipping Refrigerant Calibration
Your AC system needs the correct amount of refrigerant to operate efficiently. Overcharging or undercharging can damage the compressor, reduce cooling capacity, and increase operating costs. Improper refrigerant levels are one of the most overlooked AC installation mistakes—and one of the most harmful.
A professional HVAC technician from Shellaby A/C & Refrigeration uses precise tools to charge your system in accordance with the specifications provided by AC manufacturers. This ensures you get maximum efficiency and keeps your manufacturer’s warranty intact.
Inadequate Drainage Setup
During operation, your air conditioner produces condensation that must be drained safely away from the unit and your home. Improperly installed or sloped drain lines can lead to water leaks, mold growth, and damage to your walls or floors.
We always install drain lines with proper pitch and cleanout access, ensuring safe and effective removal of condensation. This protects your home and supports long-term AC performance.
Forgetting Final Performance Testing
After installation, every component should be tested to confirm proper function. This includes checking airflow, verifying electrical connections, calibrating the thermostat, and confirming the system cycles properly.
Too often, less experienced installers skip these final steps—leaving potential problems hidden. Shellaby A/C & Refrigeration completes a comprehensive system test and walkthrough with every install to ensure everything is working as expected before we leave your property.
Attempting DIY Installation
It’s understandable to want to save money, but installing an AC system isn’t a DIY job. Without the proper training, tools, and certifications, DIY installation can lead to serious safety risks, code violations, and voided warranties.
Trusting a certified HVAC technician guarantees that your system is installed according to local building codes and manufacturer guidelines. At Shellaby A/C & Refrigeration, we bring years of hands-on experience and a commitment to doing the job right—the first time.
Why Homeowners in Texas Trust Shellaby A/C & Refrigeration
When it comes to installing a new AC, choosing the right contractor matters. At Shellaby A/C & Refrigeration, we offer tailored solutions backed by expert advice, precision installation, and top-tier service. We’ve worked with every major brand and understand the complexities of residential air conditioners from both a technical and practical perspective.
We’re not just here to install your system—we’re here to ensure it performs flawlessly for years to come. Whether you’re upgrading an outdated system or starting fresh in a new home, we provide reliable, professional HVAC services designed to meet your cooling needs and budget.
Final Thoughts
Avoiding common AC installation mistakes starts with hiring qualified professionals who understand the intricacies of HVAC systems. From sizing and placement to ductwork and refrigerant levels, each detail plays a critical role in your comfort, efficiency, and long-term satisfaction.
Don’t risk your investment with shortcuts or guesswork. When it’s time to install a new air conditioner, trust the team at Shellaby A/C & Refrigeration for expert service that’s done right the first time.
Visit us at Shellaby A/C & Refrigeration to schedule your consultation or learn more about our full-service AC installation options.
Secure Your Comfort—Start Today.
Don’t settle for second-rate installation. Contact Shellaby A/C & Refrigeration now for precision AC setup that maximizes efficiency, performance, and peace of mind.
