We have had Heat Pumps in De for 30 years. They do make some different noises when in heat mode. We hear whining noises and have seen steam coming from the unit. Tech informed us that it is in "defrost mode". We also hear a banging noise sometimes and told it is the "reversing valve". You may want to contact the warranty dept if you think there is a problem. They may not be able to hear the issue unless it is "Cold" outsides
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