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Extra info for Better Duct Systems for Home Heating and Cooling
23, less than half as large. Low air flow was probably a major cause of the problem. Too-Low Delivered Air Temperature with Heat Pumps In heat pump systems the delivered air temperature is usually quite a bit lower than it is with most furnaces. This is because the efficiency of a heat pump is maximized if the condensing temperature is kept low, whereas the efficiency of a furnace is not affected very much by the temperature of the delivered air. Heat pumps generally deliver air to the supply plenum at 85 to 110 “F.
Revision: January 16,200 1 CUSTOMER BENEFITS FROM BETTER DUCT SYSTEMS This is the third in a series of guides intended to provide a working knowledge of residential heating and cooling duct systems, an understanding of the major issues concerning efficiency, comfort, health, and safety, and practical tips on installation and repair of duct systems. These guides are intended for use by contractors, system designers, advanced technicians, and other heating, ventrlating, and air-conditioning (HVAC) professionals.
The net cost of the retrofit was $900 minus the $500 savings for the smaller equipment, or $400. Saving $200 annually thus would pay back this incremental investment in two years. The economics of duct repair are helped considerably by the savings on the smaller unit. 5 years. This is still an attractive investment for most customers, but 2 years is even better. Note once again that, for many customers, the dollar savings will be merely thefiostifzg on tlte cake. Once they realize the thermal comfort, health and safety benefits of a good duct system, they may be willing to accept that there will be dollar savings and let it go at that.