I have a large 2 story house.

Both floors have train HVAC systems there about 9 months old.

I have a 500 gallon wood boiler that I would like to use for heat. I did have the heat exchangers installed when they installed my systems.

As far as the controls Iím running 2 thermostats on both units; one for the train and one for the wood boiler.

I would like a thermostat that would control both systems and have a water temp sencer so if I donít have the boiler running then it would use the heat pump.

I do have it working the way I want it to right now but itís using 4 relays on both systems and it dose not always work right.

Anyone have any solutions for me? I talked to the people at the train place and no one knows of anything to help.