What Size Ac Unit Do I Have

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Easy To Use A/C Size Choice Tool: Check the color coded map above and confirm the zone your home is in. And then, on the chart included underneath, select the square footage of your dwelling house forth with the zone yous're in. From there you can select one of units that volition be most efficient for your habitation.

	ZONE i	ZONE two	ZONE three	ZONE 4	ZONE 5
1.5 Tons	600 - 900 sf	600 - 950 sf	600 - 1000 sf	700 - 1050 sf	700 - 1100 sf
ii Tons	901 - 1200 sf	951 - 1250 sf	1001 - 1300 sf	1051 - 1350 sf	1101 - 1400 sf
two.5 Tons	1201 - 1500 sf	1251 - 1550 sf	1301 - 1600 sf	1351 - 1600 sf	1401 - 1650 sf
three Tons	1501 - 1800 sf	1501 - 1850 sf	1601 - 1900 sf	1601 - 2000 sf	1651 - 2100 sf
3.5 Tons	1801 - 2100 sf	1851 - 2150 sf	1901 - 2200 sf	2001 - 2250 sf	2101 - 2300 sf
four Tons	2101 - 2400 sf	2151 - 2500 sf	2201 - 2600 sf	2251 - 2700 sf	2301 - 2700 sf
5 Tons	2401 - 3000 sf	2501 - 3100 sf	2601 - 3200 sf	2751 - 3300 sf	2701 - 3300 sf

Proper System Sizing

A lot of real scientific discipline is included in the methods of calculation when selecting the correct size central air conditioner for your domicile. For instance, one of these methods is a Residential Load Calculation.

Another method for sizing air conditioners is determining the size of the air conditioner system that's currently in place. Manufacturers ordinarily don't list the size of the air conditioner unit but don't worry! The organisation capacity is almost e'er coded into the model number of the outdoor unit.

In most cases you can use the conversion information below to assist in determining the size of your existing air conditioner system (use the system model number NOT the serial number)

eighteen = 1.5 tons
24 = 2 tons
xxx = 2.five tons
36 = iii tons
42 = 3.five tons
48 = 4 tons
threescore = 5 tons

A Warning Before Yous Start Sizing Your Air Conditioner: Do not to make the mistake of buying an A/C that's too big! When you lot install an air conditioner that'due south as well big for the space, it does what is called a 'curt cycle'. A curt bike is when the compressor doesn't run for enough time to dehumidify the surface area yous're trying to climate command. A short cycling A/C system isn't the just concern; in most cases the system will cycle on and off more ofttimes, this translates to an increase in operating costs and an overall reduction in the system's life. Proper air conditioner sizing is critical to optimize operation.

Heating Square Footage Past Climate Zone

ZONE 1	ZONE two	ZONE 3	ZONE 4	ZONE 5
30 - 35 Btu's per foursquare foot	35 - 40 Btu's per square foot	40 - 45 Btu's per square foot	45 - 50 Btu'south per square foot	50 - 60 Btu'due south per square foot

Heating Guide

Here we will embrace how to employ the heating guide portion of this selection guide. You lot volition need to use the lower of the two numbers if you know your habitation to be well insulated; employ the higher number if your home is older and poorly insulated – be honest! It will pay off in the finish. (Here'due south another Hint: Y'all should select the larger of the two numbers if you're completely unsure of your home's insulation)

If you tin can find your furnace model number, y'all can skip the calculation and look upward your model number to find exactly what you need. Please refer to this furnace model number decoder to help determine what you currently have. If you lot have issues with this, give us a call and we are happy to help.

You will and so quickly multiply the correct number above by your home's total heated square footage. At this point yous volition take arrived at your approximate heating chapters requirement.

An instance yous can reference: If your abode is in the yellow zone, your home is adequately insulated, and you lot've got 2000 heated square anxiety, the equation volition look something like this:

2000 foursquare anxiety
X twoscore heating factor (from the chart above)
80,000 Btu bodily output

Adjacent, if you demand to calculate the output you need on a gas furnace, only multiply its efficiency by its listed input rating for the BTU output of estrus.

An example yous tin reference: If a furnace is listed with an input rating of 100,000 BTU'due south and an efficiency rating of fourscore%, it would produce:

100,000 Btu input
X .80 efficiency
80,000 Btu actual output

If the aforementioned 100,000 BTU furnace has an efficiency rating of 93% it will produce:

100,000 Btu input
X .93 efficiency
93,000 Btu actual output

Seeing a pattern here? In the example higher up, using an 80% efficient furnace, the 2000 square human foot home higher up would require a 100,000 BTU input furnace which will produce the necessary lxxx,000 BTU'southward output of oestrus.

Variables

Let's talk nearly all of the variables that come into play when selecting a new air conditioner system or furnace. One such Variable is your insulation, another whole fix of variables being the type and number of windows in the space, number of stories in your home, the construction type, etc. All of these variables will greatly affect the required BTU's per square for both heating and cooling. A practiced rule to follow is if your domicile is well insulated and has newer fashion windows, you lot tin can (in about cases) safely choose the smaller size arrangement that conforms to the specs needed for your total square footage.

Is your dwelling house two story? If the reply to that question is 'yes' it volition place less of a load on the system in the downstairs floor because the 2nd flooring acts every bit additional insulation. If your habitation isn't well insulated or if it has older style windows and an obscenely high number of windows, you're going to desire to select a larger system that falls within your specified square footage range. The less insulated and more than windows within the environment, the more than probable yous will experience greater air and heat loss.

Click here for a Manual J calculation for your home

Quick Sizing

Sizing Computer
Square Feet:

Zip Code:

Ceiling Height (feet):	Sun:	# of Windows:
Wall Insulation:	Window Insulation:
# of People:	Kitchen:

Commercial Packaged Unit Ac Sizing

In this section we will help y'all to decide the correct size for your commercial organization. It is e'er recommended to go with the aforementioned size equipment that y'all accept currently yet this guide will assistance yous size for new structure or addons.

The commencement step is to calculate the square footage of your building or the rooms you are wanting to cool. Please notation that the following calculations are based off of an 8' ceiling.

Once y'all accept the square footage, split that number by 500.

Next you will want to multiply the number by 12,000. This will give you the base BTU'south required to cool the area.

Nosotros recommend to add 380 for each person that works in that space throughout the day. We also recommend to add ane,000 for each window and 1,200 for each kitchen.

Once you have the all of the items added up you volition want to divide past 12,000. This volition give you lot the required tonnage to cool your commercial infinite.

Duct Work Sizing

Duct work sizing is besides very critical when upgrading or irresolute your system. We have come up with a simple guide to size your duct work. Delight keep in heed that this guide is only to exist used as an estimate and we would highly recommend a technician to check your duct work and ensure that the proper duct work size is used. Click here to encounter the duct work sizing nautical chart.