Re: Quiet here, so can I talk about my heat pump?
My mini-split heat pump is 6 years old and I've never had that problem. I've checked the indoor output at various temperatures and it will still after 30 minutes at minus 28 C put out 120 degree F air with the fan on full speed.
As per the manufacture's instructions I don't use it below -30 C
The gas furnace is usually running anyway so it just works a little harder if it ever gets too cold.