Advice for slab addition

TOO Big

the 431 is way to big for that area, go with the 263. You will not condense as much and subject the heat exchanger and vent system to all the corrosive by products you will get with the larger unit. Of course this will not help in cooling the area and you will need to run a gas line to it. I still thing ductless is the way to go here!

therinnaiguy said:

the 431 is way to big for that area, go with the 263. You will not condense as much and subject the heat exchanger and vent system to all the corrosive by products you will get with the larger unit. Of course this will not help in cooling the area and you will need to run a gas line to it. I still thing ductless is the way to go here!

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With all due respect, how do you have any idea what my heating requirements are? We're talking about a small area for that much heat usually, yes. But I was referring to a home addition that is connected to the home only by a hallway. This means almost all of the 4 walls are exterior walls, there is about 25% glass area on the walls, skylights, cathedral ceilings, and the structure would be on a slab.

Heat loss calcs w/ a -10 design temp as required in my area came up w/ about 11900 BTU required. The 463 would be 14000 BTU output MAX, since I believe it adjusts. The 263 would only be 9200 BTU.