Top HVAC Installation Mistakes to Avoid

Installing a new heating or air conditioning system can significantly enhance your daily home life by providing improved comfort, decreased energy expenses, promoting good health, and increased productivity. However, an improper HVAC installation can quickly turn into a nightmare. It can cause poor indoor air quality, frequent repairs, early replacement, elevated energy costs, and unpleasant living spaces. To guarantee quality installation, it is essential to select experienced and certified HVAC contractors. As a homeowner, you can also play a role in the process by educating yourself on common HVAC installation errors and taking steps to avoid them.

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Top HVAC Installation Mistakes to Avoid

Here are some HVAC installation mistakes you need to stay clear of.

Choosing Incorrect HVAC System Size

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Many homeowners believe that a larger HVAC system is synonymous with improved performance. Most believe purchasing the biggest system they can afford is a wise investment. This isn’t true.

The optimal size depends on the estimated energy requirement of your home. Professional HVAC contractors conduct intricate calculations that take into consideration various factors like regional temperatures, shading from nearby buildings, the orientation of the house, total interior floor space, ceiling height, and more. This will determine the exact amount of power needed for the HVAC system to heat or cool your home effectively. On the other hand, inexperienced contractors may make incorrect suggestions based on rough estimates rather than precise calculations.

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Poor HVAC Duct Installation Practices

While a good design is important, proper execution is equally crucial. Some contractors may come up with cost-effective and functional designs. However, their technicians may not have the necessary experience, such as prioritizing speed over quality, resulting in poor installation practices. For instance, they might use tape as a makeshift solution to seal gaps, eventually leading to leaks and decreased system efficiency. These can drive up your monthly energy bills. Make sure you hire a reliable HVAC company, like Tevis Energy, that utilizes top-notch materials for a secure and efficient installation.

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Retaining the Old Ductwork

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Retaining the old ducts when installing a new HVAC system could help you save costs, but this may not be the best option in all cases. Incompatibility issues may arise if you need to change the furnace or air conditioning size. Old ducts may not be sufficient in size for optimal airflow.

If these ducts were installed many years ago, they might have leaks, dirt, mold, and other problems. The original ductwork design may also not be suitable for evenly distributing conditioned air throughout the home. It is better to consult a trustworthy HVAC contractor to design and install new ductwork.

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Related Article: Signs Your Heat Exchanger May Be Cracked On Your Gas Furnace

Poorly Designed HVAC Drainage System

When air conditioners operate, condensation forms around the coils, producing moisture. The installer must ensure that the AC unit collects and removes the water to prevent it from spilling into other areas of the home. This can lead to mold and mildew growth, as well as potential damage to drywall and flooring. The moisture accumulation can create a breeding ground for bacteria that can lead to unpleasant odors. To avoid these issues, it is crucial to ensure that the HVAC drainage is correctly installed from the start. An experienced HVAC professional will have the expertise necessary to design and install the system properly.

Incorrect Ventilation for Toxic Gasses

carbon monoxide

The system must have proper ventilation to discharge toxic gases produced during combustion safely. Furnaces emit carbon monoxide and other dangerous gases when burning fuel. As long as the exhaust system efficiently removes these gases from the house, there won’t be any issues. However, improper installation can result in the release of these hazardous gases inside the home, which can be lethal. To safeguard against this, every household should have a carbon monoxide detector to detect the presence of colorless and odorless gas. To ensure the safety of your home, ask your HVAC contractor about their knowledge and understanding of proper combustion safety.

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Related Article: Why Are My Rooms Heating Unevenly?

Improper Placement of the HVAC Unit

By simply being attentive, HVAC contractors can easily avoid common mistakes. One such mistake is placing new HVAC equipment in the exact location of the old units without first checking for proper placement. This can perpetuate existing errors rather than correct them. To ensure efficient operation, it is vital to keep the AC condenser out of direct sunlight as much as possible. This will reduce the strain on the system. The same principle applies to the thermostat. If it is located near windows, it may become overheated and provide incorrect sensor readings. A seasoned HVAC technician will have the expertise to determine the optimal location of your HVAC unit and its components.

No Clearance Around the Condenser’s Perimeter

To function optimally, the condenser requires adequate space to circulate air. However, in some rush installations, this crucial component may not be given the space it needs. It is recommended to provide at least two feet of clearance around the perimeter of the condenser, which is necessary for proper air intake and efficiency. Neglecting to do so can result in increased energy consumption and premature wear and tear on the system. To prevent this mistake, the homeowner should maintain the necessary clearance by keeping the area free of obstacles and trimmed of any nearby vegetation.


Homeowners may be unaware that mistakes in HVAC installation are prevalent. To rectify these errors, it is common for seasoned contractors to be brought in to fix the work of inexperienced ones. To save yourself from incurring additional service costs, it is crucial to make the right choices: hire a reputable, certified HVAC contractor in your local area.

Tevis Energy’s sister company, Modern Comfort, performs HVAC installations, replacements, tune-ups, and more. Our technicians can provide you with expert HVAC services to ensure that your system provides you with the comfort and efficiency you deserve. Call now to schedule an appointment.

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Call Tevis Energy For All Of Your HVAC Requirements

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At Tevis Energy, we provide exceptional HVAC services to homeowners in central Maryland and southern Pennsylvania. Our team comprises the most highly-skilled and certified technicians with a wealth of experience and expertise in conducting heating and cooling replacements, tune-ups, installations, and repairs with precision.

Our friendly technicians are equipped to handle any HVAC system with ease, ensuring a smooth and seamless service experience for our customers. We pride ourselves in offering the most competitive prices for HVAC installations and maintenance services in the region. Our goal is to improve your home’s comfort, indoor air quality, and energy efficiency while reducing your HVAC expenses.

If you need HVAC repair or replacement, we will work with you to find the best solution for your home that fits your budget. At Tevis Energy, we stand behind our work and guarantee your satisfaction. Contact us at (410) 876-6800 to schedule your next appointment and take advantage of our free in-home estimates.

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