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The Water Cooler
General Discussion
HVAC problem (undersized unit)
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<blockquote data-quote="_CY_" data-source="post: 2776499" data-attributes="member: 7629"><p>some clarification about sizing ... purposely undersizing is not good .. neither is oversizing. what you really want is to correctly size .. a pro will do a Manual J calculation. 500sf per ton can be used as a rule of thumb but going by rules of thumb can sometimes get you in trouble. </p><p></p><p>let's forget about labeling for a minute and examine what type problems under/over sizing causes. below only covers main points</p><p></p><p>1. if HVAC unit is truly undersized unit will struggle to keep up and run almost all the time. naturally this drives up electric bills. but note several other factors can cause HVAC unit not to run at peak efficiency and cause unit to run all the time too. </p><p></p><p>2. if HVAC unit is oversized .. unit will not run long enough to properly dehumidify the house. for air to feel comfortable besides lowering temperature, air has to be at proper humidity levels. your evaporator condenses an amazing amount of water .. if the inside drain line should plug one finds out quickly how much water is generated. </p><p></p><p>a properly size HVAC should be able to pull temps down to a comfortable range on the hottest days. when unit cycles on should run long enough to properly dehumidify house to feel comfortable. then unit should not cycle again for awhile .. how long depends on outside temps, time of day, etc. etc.</p></blockquote><p></p>
[QUOTE="_CY_, post: 2776499, member: 7629"] some clarification about sizing ... purposely undersizing is not good .. neither is oversizing. what you really want is to correctly size .. a pro will do a Manual J calculation. 500sf per ton can be used as a rule of thumb but going by rules of thumb can sometimes get you in trouble. let's forget about labeling for a minute and examine what type problems under/over sizing causes. below only covers main points 1. if HVAC unit is truly undersized unit will struggle to keep up and run almost all the time. naturally this drives up electric bills. but note several other factors can cause HVAC unit not to run at peak efficiency and cause unit to run all the time too. 2. if HVAC unit is oversized .. unit will not run long enough to properly dehumidify the house. for air to feel comfortable besides lowering temperature, air has to be at proper humidity levels. your evaporator condenses an amazing amount of water .. if the inside drain line should plug one finds out quickly how much water is generated. a properly size HVAC should be able to pull temps down to a comfortable range on the hottest days. when unit cycles on should run long enough to properly dehumidify house to feel comfortable. then unit should not cycle again for awhile .. how long depends on outside temps, time of day, etc. etc. [/QUOTE]
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HVAC problem (undersized unit)
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