Mikebarone
DIY Senior Member
Hey, it’s me again. Hang on for this one!
I am in Phoenix Arizona. A close friend of mine that has a 5 ton A/C unit, (that heats with propane gas) on her house. Her house is 2700 square feet, and the wall insulation is just moderate. I think the unit is under sized for the house. I would like to add an additional 3-1/2 ton heat pump on the house, but I would like to hook them up to run like a two stage compressor would run. I would like to have the 3-1/2 ton heat pump run as the primary unit, and then when it’s not keeping up with the set temperature setting on the thermostat, it would shut off the heat pump and turn on the existing 5 ton unit.
Could I do this with a two stage, (heat/cool) thermostat? Even if I had to install like a low voltage relay to the second temperature setting on the thermostat that would shut off the 3-1/2 ton heat pump while the existing 5 ton unit is running.
I know this sounds, a little “off of the normâ€, but I got the heat pump for nothing and her propane bill is out of site. Before I do any of this work, I am going to do a leak test on her duct work system, and see if that is why her propane bill is so high.
Thanks, Mike
I am in Phoenix Arizona. A close friend of mine that has a 5 ton A/C unit, (that heats with propane gas) on her house. Her house is 2700 square feet, and the wall insulation is just moderate. I think the unit is under sized for the house. I would like to add an additional 3-1/2 ton heat pump on the house, but I would like to hook them up to run like a two stage compressor would run. I would like to have the 3-1/2 ton heat pump run as the primary unit, and then when it’s not keeping up with the set temperature setting on the thermostat, it would shut off the heat pump and turn on the existing 5 ton unit.
Could I do this with a two stage, (heat/cool) thermostat? Even if I had to install like a low voltage relay to the second temperature setting on the thermostat that would shut off the 3-1/2 ton heat pump while the existing 5 ton unit is running.
I know this sounds, a little “off of the normâ€, but I got the heat pump for nothing and her propane bill is out of site. Before I do any of this work, I am going to do a leak test on her duct work system, and see if that is why her propane bill is so high.
Thanks, Mike