Sizing an Air Conditioning Unit

When it is time to buy a new air conditioner, there is a lot to consider. From deciding whether to get the latest smart technologies or choosing based on home efficiency and air quality, one of the most important factors to consider is what size unit should be installed in the home. After reading this article, you should feel comfortable with the key components that go into sizing an air conditioning unit and what's best for your new cooling system.

Consider cooling capacity

Air conditioning cooling capacity is the amount of space your unit can effectively cool. Having the proper-sized unit cuts down on energy costs and helps a home stay comfortable. Most commonly in American households, cooling capacity is measured by BTUs per hour. BTU stands for British Thermal Unit and is calculated by measuring the amount of heat needed to increase a single pound of water temperature by one degree of Fahrenheit. Based on this measure, the higher the BTU rating, the more the air conditioning unit can cool a space. 

Know your room size and height

It may seem like the best choice to get a larger air conditioning unit to cool the space faster, no matter the size, but the faster the unit and larger the output means unnecessarily large energy bills. Additionally, a unit too small for the space will not sufficiently cool the room.

As you continue reading, you'll see a calculator for figuring out the BTUs based on typical use and the other factors in cooling the home. Measuring the size of the space needing to be cooled is the first step in finding the best cooling and heating system for each room.

Climate and location matter

Humidity and location of the room being cooled or heated will significantly impact on air conditioning system usage. More humid areas need more air conditioning, as air conditioners work to remove extra moisture in the air and dehumidifies the environment for more comfort.

The unit's location may rate higher or lower on the BTU scale, depending on where it is placed. Kitchens require more cooling capacity and will increase the BTU rating of the air conditioner. Furthermore, rooms in shaded areas usually need about 10% less cooling capacity from the units than those in direct sunlight.

Windows affect A/C unit sizing

This occurs in more ways than one. Windows provide draft and air leakages and will change the efficiency of a cooling system. If a home has many windows, it may require a more substantial unit because it is losing heat or cool through the windows. Conversely, more windows in a room usually allow more direct light. Natural light is often a selling-point for homes as a way to brighten the space, but it also brings more heat to the room during warmer or sunny days.

Calculate your BTUs 

Properly sizing an air conditioning and heating system for each room of the house probably sounds overly complicated. That's why we like this BTU calculator that takes into account the numerous factors that apply and estimates what's needed to best cool and heat your space.

911 Heating, Cooling and Plumbing can service all commercial and residential HVAC and plumbing needs. Call 602-795-2900 today!