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Old 05-24-2010, 10:50 PM   #1
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heat pump heat lost calculations ???


I did a heat loss calculation from HVAC computer systems, great program, one thing I am unclear of there are two large rooms in my house that were an addition and the previous owner never ran ducting to them ( use electric and on has a fireplace) would I include these rooms in my calculations???

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Old 05-25-2010, 09:09 AM   #2
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heat pump heat lost calculations ???


Yep. If they have exposed walls heat will radiate thru them and will add load to the furnace/unit when the supplemental heat is Off. They also add to the cooling load. Do the calculation both ways and see how big a difference there is. You may want to get Pro to assess your ductwork size for a new furnace B4 replacing it if you have it for supplemental heat/dual fuel. Depending on your climate a smaller furnace may be okay. A 2 or 3 stage furnace may also help as it runs longer and uses less gas. Heat loss calcs are not gospel and an experienced tech can help determine the proper size.

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Last edited by yuri; 05-25-2010 at 09:50 AM.
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