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“Modern heat pumps require a change in thinking around the need to discharge really hot air in Winter” Answer: True – let’s consider some other related myths. Myth: There’s no warm air coming out of the vents Reality: • With older heat pumps, the heat off the coil typically did not get above 95 degrees F. • Electric strip heat (backup heat) was required to provide immediate warmth. • Today’s modern designs of heat pumps can produce up to about 125 degrees F delivered air temperature off the fan coil, equivalent to natural gas heaters. • Heat is distributed quickly (within five minutes) without the need for electric strip heat. • At 32 degrees F, new designs will easily meet the load. (Some heat pumps with variable capacity can get roughly 100% capacity at 5 degrees F, and approximately 86% capacity at -13 degrees F.) • With natural gas furnaces, the air from the vents is “hot” because gas burns at a high temperature, and therefore the air feels hot. With heat pumps and variable capacity, the air is at the thermostat set point. Myth: During defrost cycle, there is a cold draft coming from the ducts. Reality: With today’s heat pumps, the system pulls heat out of the conditioned space to defrost the system. However, the fan runs at a relatively slower speed, so there is no sensation of cold air blowing into the space. Real comfort means no drafts - hot or cold. PROPERTY OF SOUTHERN CALIFORNIA EDISON, 2020. DO NOT ALTER. 51PDF Image | Heat Pumps for New Construction
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