So, we contacted the original contractor that did our house back in 2004 and had him drive 2 1/2 hours to get us a recommendation and bid. Here is their recommendation: Take out the existing unit, replace with a 6 ton hydronic/forced air combination unit for the radiant floor heating and forced air needs of the first two levels.Then, upstairs, add a 3 ton forced air unit on the upper level. But, just to be on the safe side, I want to ask this community, is this the route to go?This has led to multiple problems with humidity levels in our house - RH levels around 60-62% in the summer.Additionally, cooling bills in the summer skyrocket since it is not cooling properly.Turns out the copper coils are leaking/spraying inside the unit (basically spraying so that the drip pan inside the air handler does not catch the water) so we turn the valves off for that unit and try to decide what to do.Firstco says a new coil sytem will be around $-$ plus installation. We know the single 10 ton unit is not the answer - a unit like this should be used in a large farm or commercial building to basically handle radiant floor capacity issues and forced air demands.
Assuming they were designing the system for us, we allowed them to install one LARGE water to water geothermal heat pump system.
I have done many houses with about the same setup, 8 to 10 ton ww with multiple air handlers and radiant. Air handlers and never have that problem, pumping to much water threw coil?
A HBX Eco controller is a great way the control a two stage unit like that, it will turn on second compressor based on where tank temp is and run time, it will also rotate compressors.
A 6 ton combo unit is not the way to go unless you need 6 tons of cooling which I doubt. etc etc --- Note: in 50-52 deg good wet/damp clay soil, and just 5 to 6ft deep, a first coil of 500 ft may be enough for a HW generator in the system (de Superheater for Dom HW) and the rest 5500 ft for barely a loading that will keep the fluids coming back to the system at 3 gal per ton (27 to 33 Gal per Minute, in a coldest -10f night , loop fluid temps then above Energy Star 32 ratings usage, and more importantly above 26F deg returning to the ground loops)...
If you think you can't control the humidity now wait till your trying to cool with that not to mention you probably don't have 6 ton of duct to run it off. BRACKETS in response from JP We built...decided on geothermal. 9 to 10 ton residential loading in the midwest can range from 2000 sq ft hm with 1200 sq ft glass, to 12000 sq ft liv space (insulated rec rooms below) etc with super insulation and great glass and shades at night...