How mini split heat pumps work in a LEED or Passive House high efficiency zero net energy home - video

I think you may be referring to this article here perhaps about the Edelweiss House where we used an air source heat pump as well as an air to water heat pump water heater?

Increased efficiency with an air source heat pump and heat pump water heater working in tandem

A heat pump water heater will act to cool a house, but unless your home is fairly compact, extremely well-insulated and airtight, it likely wouldn’t cool your home anywhere near enough to be a viable alternative to a mini split heat pump air conditioner.  We used an air source heat pump to feed a heat pump water heater in the Edelweiss LEED Platinum Demo house, and since with was a superior building envelope the water pump did provide a noticeable difference, but that combination won’t always have the same effect. We also did have other cooling strategies, including window shading and a mini-split heat pump.

And an important note about air to water heat pumps – during the winter months it will draw in the air from the home to generate hot water, and eject cool air, but it is only as efficient as your other heat source. Meaning, if your home is heated with heating oil, natural gas, and your water heater uses that heated air, your water is also effectively heated with that same fuel. It’s just a consideration worth remembering, they are a great product but in some cases it isn’t always worth the added investment. If I have misunderstood what you are asking please feel free to write more details. 
 

When looking for a heat pump for a home, we would recommend checking the specs page on whatever heat pump brand you are looking into, but first make a short list by eliminating any that don’t carry an ENERGY STAR certification. WE have used a couple of different brands, here is our heat pump installation video that may help you choose –

How heat pumps work in LEED or Passive House high-efficiency zero net energy homes - video

In our 2015 demo house build  (the LEED V4  Platinum Edelweiss House) we used the Mitsubishi Mr. Slim Mini-split heat pump as seen in the video on that link above, and we were really happy with it. That one is not ducted, and it has an infrared sensor that tracks occupants to provide additional heating and cooling comfort by directing itself towards you when you are in the room.  

Our most recent build is a LEED Platinum prefab kit home with a solar air heated floor to provide most of the heat, and we included a ductless heat pump on the second floor.  We used the CS11M model from Direct Air. Both of those manufacturers have 24k BTU models, so you really can’t go wrong with either. Heat pumps are the most efficient heating system, and performance is improving all the time. If you find another manufacturer or model you like better, please let us know about it!