Correct Air Conditioner Sizing: Benefits and Method

Homeowners in Lehi have three options for air conditioner system types: ductless system, conventional split system, and packaged A/C system. The basic role of the system remains the same, that is, to dehumidify the air and cool the temperature. Each of the systems contains a condenser coil, a refrigerant, a compressor and an evaporator coil. While there may be numerous design differences, one thing applies for all systems: correct sizing is crucial. Lehi temperatures can sometimes become sweltering, and only a quality system with ideal sizing will maintain comfort.

Reason to Size Correctly

Efficiency is the main reason experts on HVAC in Lehi insist on exact sizing. For most people, bigger may seem better even for an air conditioner. However, these devices operate best when sized for specific conditions. When sized correctly, the unit will cool the house slowly and smoothly instead of rapid cooling.

Two mistakes may occur when sizing an HVAC system. These are:

Oversized System – A system is considered oversized if it’s too big for space it’s serving. Apart from using too much power for nothing, such a system may appear harmless. However, you want to be wary of the short cycling problem that may occur. An oversized system leads to stoppage of the thermostat before a full cycle completion. Each air conditioner is designed to deliver a set amount of air at a given time. Short cycling will only lead to wear and tear of the system. Furthermore, such a system is extremely inefficient compared to a correctly sized one.

Undersized System – The air conditioner may also be smaller in comparison to the room(s) it is cooling. The biggest issue is that the unit will not have enough output, so efficiency is highly affected. As the A/C tries to keep the space cool, it works longer than usual.

The Best Size for an Air Conditioner


Getting the best size is a systematic process that’s more complex than it may seem. The size of your home is a big factor, but there are several other considerations to make. One of the most important ones is insulation, as it can affect how well the house retains heat. A house that has good insulation will not require as much air conditioning as one that is poorly insulated.

There is also the issue of the climate in Lehi, in addition to others such as the nature of windows, heat transfer in windows, number of occupants, and type of foundation. After looking into these factors, you will appreciate why HVAC designers use different approaches when calculating loads for new and existing homes. New homes can use manuals produced by reputable organizations such as the Air Conditioning Contractors of America. For older homes, the best approach is to measure the run time for the air conditioner at design conditions.It’s highly recommended to hire the services of a professional owing to the complexity of the process.

You can only be confident that your air conditioner will work if you size it correctly. While the sizing processes are documented, only an HVAC professional can help you get the best system size for your property.

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