Are you having a Heat Wave?
If you are having a heat wave and need a new air conditioner, you will also need this formula… For those of you who saw our related video called Heat Wave on the GoingTrueGreen YouTube channel, this may prove to be an easier way to copy down the formula.
Using the W.H.I.L.E. Formula will help you when buying a new window or through the wall AC unit. This formula tells you the BTU size you will need to cool your room efficiently.
Sometimes salespeople at stores use a formula that only helps to sell inventory. So it is best for you to calculate your BTU size before you even leave your house.
The W. H. I. L. E. Formula divided by 60 equals the BTU size needed:
W = Width of your room
H = Height of your room
I = Insulation value in the walls
plug in the value of 10 for “I” when you have well insulated walls with R-13 or higher insulation value.
plug in the value of 18 for “I” when you have poorly insulated walls with R-11 or less.
L = Length of your room
E = Exposure
Take the longest wall in the room that is exposed to the outside and see which direction that wall faces:
plug in the value of 16 if that wall is facing North
plug in the value of 17 if that wall is facing East
plug in the value of 18 if that wall is facing South
plug in the value of 20 if that wall is facing West
Then multiply W x H x I x L x E divided by 60 to equal the BTU size you need
The WHILE formula DOES NOT calculate factors such as:
– Body heat, are you having a party? Body heat adds up.
– Window exposure, are they facing south or west or both? Do you have and use shades or curtains?
– Large openings into the room without doors.
– An Upstairs room, an uninsulated or poorly insulated Attic floor above, and/or is your roof Flat?
– Uninsulated Basement ceiling below.
To see what the Yellow Energy Guide looks like visit this posting on the Blog at GoingTrueGreen.com.
Once you know your BTU size you can go shopping and LOOK for the Yellow Energy Guide Label on the floor models. You want to find a model in the BTU size you need that has the Highest EER number possible. The Energy Efficient Rating is very important and only the yellow guide label tells you if you are buying the best AC unit out there in your BTU size. Even if the AC unit has the Energy Star Label that DOES NOT necessarily mean you are buying the most energy efficient model made. You have to use the Yellow Energy Guide to know that.
Also don’t worry about the most efficient model costing $75 or $125 dollars more, you will save that difference on the electric bill within the first full season of use. Thank you.
Bill Lauto, GTG