"JJ" wrote in message
news
My house has a 15x15 addition with southern exposure, vaulted ceiling.
The
addition sits on a concrete slab that has coils running through it for
heat.
They are connected to a propane gas boiler which also heats the hot water.
The rest of the house is gas-forced air. The addition can be closed off
at
night and is the way I am currently running things.
My question: Am I saving any energy by setting back the thermostat for
that
room at night and then reheating the slab in the morning? Round numbers,
lets say the room is kept at 62 from 11pm until 9am. At that point, it is
brought up in two steps, reaching 70 degrees by noon. 11pm back to 62.

I'm afraid I might have slept through the courses on thems, mass, btu
etc..

Thanks,


Your using your hot water heater for heating the slab? Sounds like a cheesy
method,IMO.

Not knowing the ambient outside air, the insulation and a bunch of other
factors it seems to me that anything here is a wild assed guess.

Guessing you might try waiting another hour or two in the morning for the
sun to help out since this is a southern facing exposure. Of course if your
having a blizzard that day, the sun will not help much. Heating a slab is
slow business. Let alone the room.
Keeping the door closed at night certainly will help a bit.