EcoRenovator - View Single Post - Idea: DIY Ground Source add on to Air Source Heat Pumps

mejunkhound · 01-23-15, 04:21 PM

Since no one has replied to you yet, I'll relate what I did to my ASHP.
We only need heat here in PNW, have not used AC more than 10 hours in the last 10 years.

Got an old condenser and txv free off CL, banded out an enlargement in the ductwork, kinda like the old A-kcoil AC add on to furnaces.

Bought a scroll compressor off ebay, made an evaporator by putting 3/4 cu pipe inside 1-1/4" pvc pipe, run the GSHP water thru the annular space. Groud water here is 54-56F year around.

Set it up so only the ASHP runs when it is > 42F outside (outside thermostat) , GSHP only if <42F and > 15F, both if < 15F (never has happened yet since the setup completed 15 years ago)

You could try something like that?

01-23-15, 04:21 PM	#2
mejunkhound Apprentice EcoRenovator Join Date: Apr 2011 Location: PNW Posts: 197 Thanks: 0 Thanked 47 Times in 31 Posts	Since no one has replied to you yet, I'll relate what I did to my ASHP. We only need heat here in PNW, have not used AC more than 10 hours in the last 10 years. Got an old condenser and txv free off CL, banded out an enlargement in the ductwork, kinda like the old A-kcoil AC add on to furnaces. Bought a scroll compressor off ebay, made an evaporator by putting 3/4 cu pipe inside 1-1/4" pvc pipe, run the GSHP water thru the annular space. Groud water here is 54-56F year around. Set it up so only the ASHP runs when it is > 42F outside (outside thermostat) , GSHP only if <42F and > 15F, both if < 15F (never has happened yet since the setup completed 15 years ago) You could try something like that?