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QUESTION:I need some thoughtful thoughts about blower speeds.
First the facts: I have a Sears 105,000 BTU / 84,630 BTU natural gas
furnace in a 1,900 sq ft 2 story house.
The thermostat is a Honeywell programmable with "fuzzy logic".
The blower speed is currently set at "Med-Lo" which is about 1,100
cuft/min or 70% of maximum (1,500 cuft/min) volume.
Question: Would the furnace be more efficient at a higher blower speed?
If so, is there a benefit from adding an outdoor temperature sensor to
trigger the higher blower speed when the outdoor temperature falls
below, say 45 degrees F.?
ANSWER: the thermostat that calls for heat is best thought of as an on-off
switch where the demand for heat is requested. could the factor of the
house's heat loss might be better handled with a variable speed blower?
remembering the comfort of your home in winter requires a balance of
temperature and humidity and sufficient oxygen from air changes.
if you blow the heat out of the plenum too fast into the house you will
not enjoy even heating of a close temperature differential of one
degree.
if you blow it out too slow the house will drop below the desired
temperature. get a digital thermometer with high low memory and monitor
the temperature at the thermostat to see how your range varies, and
determine a course of action to zone your home so no room gets excess
heat.
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