Don Foreman wrote:

Maybe with the 4000# of metal in the room, the temperature swings won't be too wide.

Right. With all that thermal mass, the room's thermal time constant
should be quite long.


I forgot to think about the concrete floor, I have a feeling that is going to add greatly
to the thermal time constant.

Wes

Concrete has considerably higher thermal resistance than metal so it
doesn't take much heat flow to get surface temp up near ambient. A big
chunk of metal needs to be warmed clear thru before it'll feel warm.

Thank you for that tidbit of information. That makes me feel better. I started looking
into it but couldn't figure out how much the concrete affected things.

I have a strong desire to know what it is costing to heat the room. I decided to wire in
a 240v Hobbs hour meter into the heater circuit so I can do a bit of math and dial the
temperature up to what I can reasonably afford. Sure wish they made a 240v version of the
Kill-A-Watt.

Wes