Ladia,
You mean you have one meter for HVAC and another for the rest of the house?

When you said above "using geo for heating only" you lost me. My system is a forced-air heating and cooling system, just like most conventional heat pumps. This is it's only function, the domestic hot water is just icing on the cake.

I know they make geo units that only do one thing...heat water. Some people use them to heat swimming pools and radiant floor systems. Is this what you were referring to?

Is your radiant floor in concrete or under a wood floor?

Hey Moe, I'm trying to think but nuthin's happening!