Cost of heating is a variable in NH... regardless of what is being heated.
Once a large body of water is heated though... it will lose and gain heat slowly.
The heat lost would be to the space around the pool, and any part of the building that is open to convection.
So probably not much difference than the same space without the pool.
Relative to the size of the overall building being conceived.
The gym in downtown Laconia... and the pool at the Gunstock Mountain Inn... have variables; but that would be to the GMI having a huge glass wall (low insulation) adjacent to the pool.
So design along with fuel type and cost are all variables.
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