Am I on the right track with this?

[Ed-G]

Background:

Existing House:
Two stories, each floor is 1056sf for a total of 2112sf.
Forced air natgas heat with 22 year old furnace.
No air conditioning.

Planned new Shop/Garage:
1850sf
Attached via 20ft of one wall.
In floor hydronic heat with boiler.
Mini-split for cooling.

At some point my 22 year old house furnace is going to have to be replaced which got me thinking in a new direction:

House:
New boiler sized for house and shop.
New air handler unit with heating & cooling coils.
New condenser used for both house coil and shop coil.

Shop/Garage:
Hydronic heat via new house boiler.
Air handler with air conditioning coil powered via house condenser.

Money not spent on future furnace replacement is used on a larger boiler and two air handlers. Plus the house gets air conditioning.

Will need to find a condenser with two independant coil capability.
Air handler in the new shop/garage is independant from the house.

What do you all think?

Thanks,
Ed

 

[pseudorealityx]

There are some limitations on how many evaporators (air handlers) and sizes to combine them onto a single condensing unit. Just make sure you plan it out. You may be in a situation that you'll need 2 condensing units.

 

[truckman5000]

There are some limitations on how many evaporators (air handlers) and sizes to combine them onto a single condensing unit. Just make sure you plan it out. You may be in a situation that you'll need 2 condensing units.

Good luck.
What i would look into. Is.

New high efficient furnace to replace existing. Great rebates going. Add a/c.

Duel zone duct-less a/c for the shop/addition. Mitsubishi has a "super heat" heat pump that dosnt loose efficiency down to -20 deg. 26 seer (i think).

Above would be cheaper than the hydro-air units and boiler work ect.

 

[pseudorealityx]

It's Mitsubishi's "M-series".

 

[truckman5000]

It's Mitsubishi's "M-series".

yes thanks, ive been drinking and was drawing a blank lol