How to Calculate Air Conditioner Size for a House Choosing the correctly sized air conditioner unit or HVAC -- heating, ventilation, and air conditioning -- system for a house or individual rooms not only makes the home feel more comfortable, but saves you money as well. Since air conditioners remove both heat and moisture from the air, a unit or system that is too large will cool the space too quickly, making it feel damp and humid. It will also use too many BTUs per hour, resulting in a higher electric bill. An air conditioner unit or HVAC system that is too small for a home won't cool it properly and can overtax the appliance. You can get a general feel for sizing on your own, with a formula commonly used to get a ballpark estimate: [(House square footage x 25)/12,000] – 0.5 = required tons. This is good way to approximate, but your installer may suggest adjustments to your estimate based on factors specific to your house, such as ceiling height, type of windows, climate and insulation.

You can also use a chart organized by square feet and climate zone to get an estimate. Calculating Air Conditioner Size Determine the total square footage of the room or rooms you want to cool. For square- and rectangular-shaped spaces, multiply the length of the area by its width. For a triangular-shaped room, multiply the length of the area by the width and divide this figure by two. Consult a chart that compares room square footage with the air conditioner unit capacity needed in BTUs, such as the one provided by the U.S. Environmental Protection Agency. For instance, if you have a 450- to 550-square-foot-room, you'll need an air conditioner unit with a capacity of 12,000 BTUs. Once you know how many BTUs per hour you need, make any necessary adjustments for special circumstances. As one example, you can reduce the unit capacity by 10 percent if the room is heavily shaded. If the space is very sunny, increase the capacity by 10 percent. If two or more people are typically in the space, add 600 BTUs for each extra person.

Also, kitchen air conditioner units should be increased by 4,000 BTUs to make up for heat generated while cooking. If you have a large home, such as one with 2,000 to 2,500 square feet, which requires 34,000 BTUs per hour, you may need to install more than one HVAC unit to thoroughly cool each room. Do a room by room load calculation by utilizing the Air Conditioning Contractors of America's Manual J Residential Load Calculation Procedure software, which is the industry standard for sizing residential HVAC systems.how much does a new outside ac unit cost The size and type of air conditioner needed depends on the size of space you are trying to cool. costs for new ac unit How to Calculate Air Conditioner Size for a House. best price ac units

Installing an air conditioner can make a big difference in how comfortable a... Choosing the right size air conditioner is important both for your personal comfort and for your energy costs. To determine what size... What Size Central Air Conditioner for 2000 Square Feet?. You can come up with a general idea of what sized air... Larger rooms need larger air conditioners. Undersized ACs may run continuously, though they aren't designed to, while still not managing to cool... How to Size an Air Conditioning Unit What Sizes of AC Units Do I Need for 1,900 Square Foot Houses? What Size Central Air Conditioner for 2000 Square Feet? Two & a Half Ton Vs. Three Ton Air Conditioner What Ton Air Conditioner Do I Need?It seems like Tesla might be making a battery for your house. Would that be cool? But why would you need a house battery? I can think of a couple of uses: For an off-grid house you might like to power it with solar or wind power. Unfortunately, neither of these two sources provide constant energy.

If you could store the energy in a battery, you could use this during the night or calm weather. Many people keep a gasoline powered generator for their house. I have one that I don’t use too often, but it’s awesome when you need it. What if you had a battery that you could use for your house in times of power outages? That would be cool. It seems like the power company would like everyone to have a battery. With a house battery, you could reduce power spikes on the grid. When you turn your air conditioner on, it draws a large current for a short period of time(here’s an explanation of why the current spikes). With a battery this current demand could be leveled out (I guess). But that’s not why you are here, is it? You want to know how big of a battery you would need. We need some starting values. First, how long do you want to run your house on a battery? I think Elon Musk (from Tesla) said one week. The next big thing is the power usage. I think a fair assumption is a constant 2000 Watt power usage.

Clearly a house would need more than 2000 watts at some point in the day. However, at night you wouldn’t need much power such that the average for the day could be 2000 watts. If you don’t like that value, you can put your own numbers into the calculations. If I know the power and the time, I can use the definition of power to calculate the energy stored in the battery. Having the power in Watts is fine (since a watt is a Joule per second) but I need the time in seconds. Now I can calculate the stored energy in the battery.But what the heck is a Joule? Sure, it’s a unit of energy but is that a large amount? Here’s a simple experiment you can do yourself. Take a textbook and put it on the floor. Now pick it up and put it on a table. In order to lift the book, you need energy (to change its gravitational potential energy). A book is about 1 kg and you lifted it about 1 meter. That makes a change in energy of about 10 Joules (don’t forget the gravitational field is 9.8 N/kg).

So now you know about Joules. Now for the battery size. The dimensions of the battery will depend on the type of battery. The current Tesla vehicles use a lithium ion battery. According to Wikipedia, the lithium ion battery has an energy density from 0.9 – 2.23 MJ/L (mega Joule per liter). I would imagine that Tesla would only use THE BEST BATTERIES! That would put its energy density at 2.3 x 109 Joules per cubic meter. If I call the energy density σ, then I can find the battery volume: Putting in values for the energy density and the battery energy: So just half a cubic meter. That’s not too bad. If you want to put this inside your house, you could make it as tall as a wall (let’s say 2.5 meters). Now from a design view maybe a battery should be just 5 cm thick. This means that it would have to be about 4 meters wide. Ok – that wouldn’t work. If increase the thickness to 10 cm, it would just be 2 meters wide. Of course, this only really works because of the high energy density for a lithium ion battery.

If you used an akaline battery (like AAs) it has a lower energy density at around 1.8 MJ/L such that it would be slightly larger house battery (but not rechargable). You can look at the Wikipedia page on energy density to get an estimate for house batteries of different materials. Just for fun, what if you made a penny battery (from copper-zinc pennies and acid)? How big of a battery would you need in that case? Here is your answer. This is just a perfect story for homework. It won’t be too difficult, so don’t delay and start soon. What if you wanted to run your house on AA Cell batteries? From my previous investigation, I found that a AA battery has about 10,000 Joules of stored energy. How many AA batteries would you need and how much space would it take up? What if you wanted to run your house on a nuclear power plant that used Thorium? How much Thorium would you need? Use the energy density from Wikipedia. According to this news, Apple will build a 130 MegaWatt solar farm to use for its stores and stuff.