Hello, I am Building a 2500sqft colonial in climate zone 5 (CT).

·        R49 Attic

·        R30 walls

I am looking for input on the heating and cooling systems.

I plan to keep all HVAC equipment and duct work in the conditioned space.

My plan is to use open web floor trusses for the second floor system and run all of the duct work in the interstitial space between the two floors which would allow me to maintain a vented roof/attic and use blown cellulose.

 Initially I was learning towards a 2 zone Mitsubishi hyper heat mini split ducted system, however we plan to run radiant floors throughout as well and wanted to avoid redundant systems and outdoor units.  I prefer the idea of using one heat pump for both heat and cooling.

 Therefore I have been looking into air to water heat pumps and running chilled water coil in the air handlers (1 per floor) possibly using a First Co hydronic air handler.  I have considered using the water coil for heating during the shoulder seasons.

I am planning to perform the install myself and I am looking for feedback from folks who have such a system and or who designed the systems.  I am looking for single entity to design the HVAC and Radiant system so that I do not end up with conflict Manual J calculations etc.

I have been investigating a few air source heat pumps including:

 ·     Taco System M

·       Enertec

·       Nordic

I attached a copy of the floor plan for the 1^st & 2^nd  floors.

Please let me know if you have any recommendations on equipment selection  (performance, reliability/maintenance & cost) or designers.

Thanks for your help!