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7 Mistakes to Avoid When Installing an A/c Unit

Noland Heating & Air a commercial HVAC company in Searcy, AR
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Installing an air conditioning unit is a significant home improvement project that should not be taken lightly. Unfortunately, many homeowners make mistakes when installing their A/C unit, leading to problems down the road. Here are the seven most common mistakes when installing an A/C unit.

1. Not Sizing the Unit Properly

Installing an air conditioner unit is a big decision. It’s essential to get the sizing of the unit right to ensure that you’re getting the most out of your investment. If the unit is too small, it won’t be able to cool your home sufficiently; if it’s too large, it will cycle on and off too often, leading to increased energy costs.

To size the unit correctly, you must determine how many BTUs (British thermal units) your home requires. This can be done by following these steps: 1) Measure the square footage of your home. 2) Multiply this number by 18. 3) Add 600 BTUs for each room in your home that is 150 square feet or larger. 4) Subtract 100 BTUs for each room in your home less than 150 square feet. The total number you come up with is the number of BTUs you need for your air conditioner unit.

Once you have determined the number of BTUs, you need, selecting a unit that is the proper size is important. The following table can be used as a guide:

BTU Requirements Recommended Unit Size

Up to 5,000 5,000 BTU unit

5,001-6,000 6,000 BTU unit

6,001-7,000 7,000 BTU unit

7,001-8,000 8,000 BTU unit

8,001-9,000 9,000 BTU unit

9,001-10,000 10,000 BTU unit

As you can see, there is a close correlation between the size of the unit and the number of BTUs it provides. It’s essential to select a unit that is slightly larger than the number of BTUs you need, as this will allow the unit to operate more efficiently.

Please contact us if you have any questions about sizing your air conditioner unit or need help selecting a suitable unit for your home. We would be happy to assist you in ensuring you get the most out of your investment.


2. Not Installing a Filter

Another mistake often made when installing an A/C unit is forgetting to install a filter. The filter is an integral part of the unit as it helps to remove dust, pollen, and other allergens from the air. Without a filter, these allergens can build up on the unit’s coils and cause it to work less efficiently.

Another downside to not having a filter is that it can cause the unit to freeze up. When the coils of the A/C unit get covered in dust and other particles, it causes them to be unable to absorb heat properly. This then causes the refrigerant in the unit to become too cold and can cause it to freeze up.

Installing a filter is an easy way to help prolong the life of your A/C unit and keep it working efficiently. It is important to remember to regularly clean or replace the filter so that it can continue to do its job.

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3. Not Leveling the Unit

Installing an air conditioning unit is a big job. It’s essential to take your time and do it right. Another mistake that many people make is not leveling the unit. If the unit isn’t level, it will not work correctly, and you will not be comfortable in your home.

To level the unit, first find a level spot on the ground. Then, use a shovel to dig a larger hole than the unit. Place the unit in the hole and fill in the hole with dirt. Use a level to ensure the unit is level from front to back and side to side. If you don’t level the unit, it will not work correctly. The air will not flow through the unit properly, and you will not be comfortable in your home. Take your time and ensure the unit is level before moving on to the next step in the installation process.

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4. Not Cleaning or Replacing the Coils

The coils of the A/C unit can become dirty over time, which can impact the unit’s efficiency. Additionally, the coils can become frozen, preventing the A/C unit from working correctly. To clean the coils, turn off the power to the A/C unit and remove the front panel. Locate the coils and use a soft brush to remove any dirt or debris. If the coils are frozen, thaw them out with a hair dryer. Once the coils are clean or thawed, replace the front panel and turn on the power to the A/C unit.

If you don’t clean or replace the coils of your A/C unit, it can become less efficient over time and may eventually stop working entirely. Be sure to keep up with maintenance to prevent any issues.

5. Not Insulating the Unit

Many people forget to insulate their A/C unit, but this is essential to ensure that the unit operates efficiently. Without insulation, the unit will have to work harder to maintain the desired temperature, which will increase your energy costs. Additionally, insulating the unit will help to protect it from the elements and extend its lifespan.

There are a few different ways that you can insulate your A/C unit. One option is to purchase an A/C unit cover. These covers are designed to fit snugly around the unit and provide an extra layer of protection. Another option is to use insulation blankets. These can be wrapped around the unit and secured with tape or ties. Whichever method you choose, be sure to follow the manufacturer’s instructions carefully to avoid damaging the unit.

6. Not Maintaining the Unit

Like any other appliance in your home, an A/C unit requires regular maintenance to function correctly. Unfortunately, many homeowners neglect their units, leading to several problems. Here are just a few of the reasons why you should never neglect your A/C unit:

Reduced Efficiency

If your A/C unit isn’t properly maintained, it will have to work harder to cool your home, reducing efficiency and increasing energy costs.

Shortened Lifespan

A well-maintained A/C unit can last many years, but a neglected unit will likely need to be replaced much sooner.

Repair Costs

Neglecting your A/C unit can also lead to costly repairs. Regularly maintaining your unit can catch minor problems before they turn into big ones.

Poor Indoor Air Quality

If your A/C unit isn’t properly maintained, it could circulate dust, pollen, and other allergens throughout your home, leading to poor indoor air quality.

Uncomfortable Home

If your A/C unit isn’t working correctly, your home will be uncomfortable. Regular maintenance will ensure that your unit is always operating at peak performance so you can enjoy a comfortable home all year.

If you’re not already maintaining your A/C unit, it’s essential to start doing so as soon as possible. Schedule a tune-up with a qualified technician at least once a year, and clean or replace your unit’s air filter regularly. By taking good care of your A/C unit, you can avoid all of the above problems and enjoy many years of comfortable, efficient cooling.

7. Not Following the Instructions

Following the instructions when installing an A/C unit is essential so you don’t have any problems. Many people try to cut corners or skip steps, which can lead to severe issues. If you don’t follow the instructions, you could void your warranty or damage your unit.

There are a few things that you should keep in mind when following the instructions for your A/C installation. First, make sure that you read all of the instructions carefully before beginning. It is essential to understand what you need to do before you start. Second, pay close attention to the diagrams and illustrations. These can be extremely helpful in understanding the process. Finally, make sure that you have all of the tools and materials that you need before beginning. This will save you time and frustration later on.

In Summary

Installing an A/C unit can be daunting, but following the instructions carefully can be done quickly and safely. There are a few things that you should keep in mind when installing your units, such as following the manufacturer’s instructions closely and making sure that you have all of the necessary tools and materials.

Noland Heat and Air is a top HVAC contractor in the United States. We have been providing quality service for over the years. Our experienced technicians are qualified to install all types of A/C units, and we offer various services to keep your unit running smoothly all year long. Contact us today to schedule a tune-up or to learn more about our


Our highly trained and expert technicians respond to HVAC calls from residents and businesses in Searcy, AR and the surrounding areas. See the complete list of our service areas below. If you cannot find your location, please get in touch, and we’ll find ways to extend our service to you.


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