How To Correctly Size An AC Unit For My House

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How To Correctly Size An AC Unit For My House

Summer is in full swing and that means one thing for homeowners: it’s time to crank up the AC! If you’re like most people, you want your home to be cool and comfortable during the hot summer months. But how do you know what size AC unit you need for your house? In this article, we will walk you through the process of sizing an AC unit for your home.


We will discuss important factors such as ceiling height, house style, and local climate, size type and number of windows, insulation and others that play a role in choosing the right size AC unit. So read on to learn more!


Important Factors


Before placing an order for a new air conditioner based on a simple arithmetic equation, you must recognize that there are numerous additional aspects to take into account.

  • Ceiling Elevation. Your home may have a vaulted or lofted ceiling, which means the volume of space in your house will affect what size air conditioner you need to cool off all those extra rooms!A common misconception about ceilings is that they’re not important when determining cooling requirements; however it’s essential because different types require varying amounts per square foot based on height (and length).
  • House fashion. The size of an air conditioning system varies depending on the number and type properties. For example, one single-storey ranch home needs less energy for cooling than a three story condo does because it has more surface area to absorb heat from warm outside temperatures before releasing them into your living space. A spacious acreage property with only 1/2 hour isolation is going require much bigger unit
  • Local climate. If you live in a hot, humid area, you will want a different-sized air conditioner than if you reside in a warmer, drier region. Temperature and humidity play an important part in determining how much cooling and dehumidifying your air conditioner will need to perform.
  • Window size, kind, and quantity. Windows typically allow for greater energy loss than solid walls. You must evaluate the size and quantity of windows, as well as their energy efficiency and sealing quality.
  • Thermoregulation. Similarly, a home with superior insulation consumes less cooling energy than one with poor insulation. Before choosing a new air conditioning system, it may be prudent to boost insulation if you are constructing a new home or undertaking a substantial renovation.
  • Additional factors. Even factors such as the existing ductwork, the kind of window coverings, the number of inhabitants and the frequency with which they are home can alter the cooling load required for your property.

Sizes of Air Conditioners

The smallest air conditioner is 1.5 tons or 18,000 BTUs, and its size can be increased by increments of one-half ton or 6,000 BTUs up to 5 tons or 60,000 BTUs. Take your home’s entire square footage, multiply it by 25, divide it by 12,000, and remove. This will give you a ballpark estimate for selecting an air conditioner.


This estimate is merely a ballpark figure and should never be used to purchase a system on its own. Other significant factors are included in the computations.


So, what’s the right size air conditioner for my house? The answer to that question depends on a variety of factors, including the climate where you live, the square footage of your home, and how well insulated it is. If you’re not sure which size AC unit is right for your needs, consult with an HVAC professional to get an accurate estimate. They can also help you choose an energy-efficient model that will save you money on your utility bills in the long run. Have you determined the correct size for your AC unit?



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Superior Mechanical Services, Inc. began in 1948 as a family-owned business with a vision to provide value-minded service with a down-to-earth approach to customers throughout the San Francisco Bay Area. As the premier Commercial  and Residential HVAC Service provider for Livermore, Dublin, and Pleasanton, Superior Mechanical can do it all, from heating and air conditioning services to boiler services, to plumbing services. Our technicians are certified professionals who will ensure every part of your project is done right using a careful checklist to guide and test each step. At the end of your appointment, we’ll show you how to get the most out of your new system and give you tips on maintenance so it lasts for years to come. Contact us today for amazing service tomorrow!



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