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Size Matters; Choosing the Right Size AC Unit for your Home

Have you decided to install a new AC in your home and wondered how to do it? It all starts with choosing the right unit for your home. This is different for every homeowner since various factors influence the decision. It is not enough to know the square footage of your home when it comes to purchasing a new AC unit. One’s cooling needs, the size of the house, the type of system chosen, and the cost must be considered when selecting an AC.

Experts will emphasize getting the right sized AC first before exploring the other factors. The size makes such a huge difference in air conditioning since it affects the system’s efficiency and eventually influences the energy consumption and cost in the long run. We will explore everything about AC sizing that will help homeowners make the right choice.

AC Unit Inspection & Repair

Why Does Size Matter?

The size of your AC matters because it determines the efficiency of your unit. In the long run, the cost of cooling your house is much lower when you choose the most suitable unit for your home. For example, when the AC unit is too small, it is highly likely to increase your energy bills and fail to cool the house properly. Also, choosing a smaller unit than your house needs will only cause the AC unit to overwork since it does not have the power to match the home’s needs.

Choosing a large AC may seem like the perfect solution, but it also has downsides. While the large AC will cool your house quickly, there is also the fact that it will shut itself off when the desired temperature is reached. This may not seem like an issue until you realize that the cooling is not as effective since your home fails to get to the right temperature. What’s more, when the unit shuts off too quickly, it doesn’t allow enough time to dry off the humidity in the air. Consequently, it affects the humidity level in your home and could even cause certain sicknesses due to the dampness and high humidity levels.

Selecting the Right Air Conditioner

Work with an HVAC technician from the word go. An AC unit is not one of those items you play around with when it comes to size. Note that bigger is not always better and maybe a reason for unnecessary increased energy bills. On the same note, a smaller unit may not be the answer if it overworks the unit, leads to high energy bills because of lack of efficiency, and eventually breaks down from overuse and have to be replaced.

The only way to avoid such inconveniences would be to invest in a fitting unit. What fits in one house may not necessarily work for another despite the similarities of the houses. Different households have different needs. Have an HVAC professional visit your home to assess your heating and cooling needs before recommending the right AC unit size.

For example, one homeowner may go for a smaller unit because they only utilize a few rooms in the house, while another one will choose a bigger HVAC system because of the need to heat and cool all rooms in their home.  

Factors Affecting the AC Size

Choosing an AC size is not as simple as many people assume. Several factors come into play. These include:

  1. The size of the house. Have a professional come and assess/ measure the cooling needs in your home first.
  2. Location of your home. Similar sized houses in different locations will have varied cooling needs. It also matters if there are any natural shades around the house or vicinity.
  3. The type and number of windows present. Windows may be a reason for energy loss and maybe the reason for increased cooling needs.
  4. The availability or lack of insulation. Adequate insulation prevents heat from penetrating the house; hence the cooling needs will be less, and the AC size may be small.

Pay Attention to the SEER Ratings

Note that AC units are created differently. It is important to ask about the SEER (Seasonal Energy Efficiency Ratio) rating, which determines the unit’s efficiency. The higher the SEER rating, the more efficient the unit is likely to be. Additionally, an efficient AC unit will also be cheaper to operate. Usually, the cost of running the unit decreases by 5 percent for each SEER rating.

Numerous other little details determine the AC sizes you pick for your home. The good news is that you do not have to figure everything out independently. Instead, hire a seasoned technician to help you know what works for your home.

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Customer Reviews

Called Absolute for my 81 year old landlord in the height of Summer heat. Scott came out to inspect the old beast of an AC and found many issues. He took the time to educate us, note everything, photograph it and provide several recommendations...and my stubborn landlord has done nothing LOL. A couple months later we asked that Scott come back out and he was there that same day.

Emily H.

Santa Ana, CA

I contacted Absolute Airflow to check my mother's AC, as it was not getting cold. The tech (Scott) arrived earlier than his scheduled time, and was very knowledgeable, professional, and most of very personable with my mother in letting her know that the issue was. Superb customer service Scott and thank you Absolute Airflow! I highly recommend Absolute Airflow.

Billy A.

Billy A.

Bellflower, CA

I have called in Absokite Airflow for my tankless water heater and A/C unit for maintenance. They were professional and took the safety precautions necessary including wearing a mask and cornering their shoes when entering my home. I recommend them highly. Shout out to Zack who took care of the tankless water heater.  They were professional and friendly.

Beatriz S.


Santa Fe Springs, CA

Carlos came to our house to access the A/C project and to give us an estimate. He was very knowledgeable and took his time to explain all the opinions in detail as well as the installation process and warranties. Tanner and Chris were the installers, they were very professional taking their time and attention to details. To keep our house clean while installing the new A/C system.

Robert M.

Robert M.

Whittier, CA