However, if you live in a hot climate, where temperatures are high most months out of the year, you will need to change the formula slightly, because otherwise your unit will be undersized.
As you may have already guessed there are a number of important variables that will effect the size of the central air system your house requires. Total number of square feet is just one of these factors. In fact, you can have homes that are identical in size, but still call for completely different size units. If the HVAC contractor recommends a 2. This would have been a good idea 20 years ago, when electricity rates were cheap, and AC units used A LOT of energy to quickly cool off the space.
In those times, bigger really was better. Today, new air conditioner units are energy efficient. This means that they save energy by running in cycles, which results in your home being cooled at a slow and steady, rather than a rapid pace. Because of this change in how the AC unit operates, its essential to get one that is just the right size for your house. Here is a quick summary of the main reasons why it is not advisable to install the wrong size central air, whether too big or too small.
In addition to sizing, its important to consider other features of a central air unit, such as the SEER rating, 1 vs 2 cycle system, fancy extras that high-end brands like to include, etc.
AC units are not all created equal. There are significant differences in pricing, quality, durability and warranties offered by various HVAC manufacturers. The importance of a quality install cannot be overstated enough. If you need to cool just a single room then a central AC may not be the best or most cost efficient system for you.
Ductless mini split systems provide targeting cooling and heating to a single room or a large area. If you get a multi-zone mini split system, then you can heat and cool multiple rooms. Besides flexibility, mini split systems offer a far superior energy efficiency compared to central AC systems. Whereas modern cenral air units have an average rating of 16 SEER seasonal energy efficiency rating , a typical ductless mini split has a SEER rating of 22, while high — end models are rated at SEER, in single zone installations.
Multi-zone mini split systems go as high as 24 SEER. Another major benefit is that a mini split AC system can be installed DIY , which is not possible with central air. Doing a DIY install saves you at least a few thousand dollars on professional labor.
While your mini split equipment may not look as attractive as invisible central air, you need to consider that you have a significant loss energy in the ducts of a central air system.
Mini splits do not have this issue because the cold or hot air is produced right inside the room. Therefore, actual efficiency of a mini split is considerably higher compared to central AC. First floor in the garage. Or do I need Tom, You will likely need two 3.
However my recommendation would then be to get two 4-zone Fujitsu ductless mini split systems 36K each. Much more efficient, powerful, and no need for ductwork. So a 5 ton really delivers only 4 tons of cooling 1 ton is lost in ducts. Mini Splits actually deliver their rated capacity right to your room, as indoor unit is in the room.
If you still want central, like I said, 5 ton is not enough, and you will likely need 3. For central, I recommend central heat pumps , which also provides efficient heating in the winter. I plan to get an AC system installation for my home soon because noon times can still get very hot in my area despite it being December.
I hope that an AC will make things a lot more comfortable in the long run. Using your calculation I come up with needed 2. I installer recommended a 2 ton unit. Is he accurate? It is like buying a 5 Amp power supply to power a 0. You can just buy a cheaper 1 Amp power supply for that. All this nonsense about costing more to run and other bs is not true.
Costing more to run will depend on your thermostat setting. I hope you can help me. Using your formula I figured a total square footage in my home at To get a free quote, call By clicking this button, you consent to receive calls about our products and services at the number you provided above.
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Enjoy more insight on creating the home you want to live in. As electricity bills soar, homeowners are reconsidering solar. Vivint Solar and Sunrun follow all regulatory policies and guidelines set forth by the Center for Disease Control CDC , as well as state and local authorities. For more information please visit vivintsolar.
All Products. Electric Vehicle Charging. Why Solar. About Vivint Solar. Verify a Consultant. Solar Resources. The Array Magazine. Online Account Help. Get a Quote. Use the below AC size calculator to give you an indication as to the size of the air conditioning unit you might need.
As I have already mentioned, there are many different factors that a pro will take into account when calculating your ideal air conditioner size. See what I mean? There are so many variables that it would be madness and probably a waste of money to try to calculate it yourself.
So here are some of the terms and phrases that you might hear thrown about. The Manual J or J Load Calculation is a term that any air conditioning professional that you speak to may or may not mention to you — but you can guarantee they will be thinking about it as they walk around your house. The Manual J calculation is used to determine the heating and cooling loads of a particular house or building. It takes into account many different factors, some of which we mentioned previously in this article.
While it is possible to calculate this manually, it is quite a time-consuming task. Luckily, HVAC contractors have access to many different software solutions to calculate this for them in a fraction of the time that it would take to do it by hand. Your HVAC specialist might contact you prior to your quotation appointment to go over some of the questions they need to ask you to plug into their software in order to save time when they are actually at your house.
It is not really necessary to go into this in more detail here, as this really is a calculation that is primarily used by professional contractors. So that is how much the weigh right? Residential central air conditioners come in a range of sizes from 1.
If you need a unit that has more than 5 ton cooling capacity, then it is likely you will need multiple AC units. British Thermal Units is a measurement of heat. Well, when we talk about BTUs in relation to AC it refers to the amount of heat that the unit can remove from the air per hour.
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