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A few minutes
time Authentic
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evaluate your homes heating and cooling systems. If you have ever wondered just
how effective your homes new storm windows or extra insulation might be there is
an easy way to figure out how much home or property is now losing. All that is
needed are inside and outside thermometers and a notebook to record the time
that your furnace runs. It is nothing more exotic or complex than that. Oh yes
and include a pen in the mix to record your measurements. In measuring heat loss
from your house use BTUH (British Thermal Units per hour) a measure of heat
quantity. Dig out your owners manual for your furnace and see what its BTUH
rating is. Let us say for example, that you have an oil-fired hot air system
rated at 84,000 BTUH. It will be controlled by a thermostat which you have set
at say 70 degrees Fahrenheit (as an example). When your house temperature drops
a degree or two below that example of 70 degrees F the furnace will thus go on
or start up and conversely when the home gets a degree or two above 70 degrees
the furnace will promptly go off. Thus, the furnace pumps a slug of hot air into
your house while it is running. It pumps
84 Authentic
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waits until your house has lost that amount of heat before it switches on yet
again. This furnace-on-time is the key to determining your homes heat loss.
After looking up your heating systems rating, you next need to find out how long
that your furnace runs as the outside temperature changes. First read your
outside thermometer, then your inside thermometer and write down the difference
between inside and outside air temperatures. Then note the times when the
furnace goes on and when it goes off and see how many minutes it actually ran.
When the furnace goes on again see how long it was since it last went on: that
is the interval between runs. Note that the time period you are measuring is
actually when your furnace is actively burning fuel not the time while only the
air blower or water pump is going. This measurement is your run time. The
easiest way to keep track of all of this is to record a simple table in your
notebook or alternatively in a record on a text file in your computer. The
colder it is the more heat is required and you will see that your furnace will
run longer each time and go on more often. The BTUH needed will increase as it
gets colder and conversely diminish when it gets warmer. When inside thermostat
settings and outside temperatures are the same the furnace will not go on at all
because no heat is required. At the other extreme, when the furnace runs all the
time because it is very cold
outside Authentic
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plant. Then if it gets even colder your house will start to cool down. Probably
and hopefully you will never experience this situation if your heating system is
the correct size and capacity to start with. You can tell at what temperature
difference this will happen by drawing a graph of the data you have collected in
the table and extending this curve to the place where it reaches your furnaces
rated capacity. The graph is constructed by putting the BTUH on the vertical
scale and on the horizontal scale the temperature difference between the home
and the outside. You can create the graph on a notebook graph paper or even
easier in 2011 a computer spreadsheet program such as Excel or Lotus can do this
in a snap. You can now plot the data from the curve, like a heating trades
technical professional, and then run a curve through the data points. The points
that you plot on the graph will not fall exactly onto the curve. The reason for
this is that someone may have gone in or out, letting cold air into the house or
building Authentic
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strong wind will cool your house faster. Another aspect to keep in mind is that
if the thermostat setting is raised , for some time after the change the furnace
run-time will vary because the structure and all the homes contents will be
warming , absorbing heat, regardless to the outside.
Conversely Authentic
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thermostat has been lowered. Before, and after you install extra insulation, add
storm windows or plug up some cracks with caulking or window door seals, take
the time and effort to gather new data and add it onto your graph. The effect of
the improvements will show up quite dramatically and easily as a new curve above
the old one. It will be clearly demonstrated to you how much you have increased
your homes insulation abilities and conversely reduced heat – and money heating
costs loss.