I bought a house with central air conditioning and propane heat. A couple
of years later the propane furnace developed a crack so I replaced the fur
nace with a high efficiency furnace. It and the air conditioning were put i
n when the house was built 28 years ago. So when I found a outside unit h
eat pump at the Habitat for Humanity store I bought it. And sure enough t
he air conditioner stopped working well. So I enlisted the help from a sem
i retired licensed air conditioning man and installed the heat pump and a n
ew evaporator. Had to install a new evaporator because the heat pump uses
But the guy I hired has never installed a heat pump with a dual fuel system
. So he is not much help with figuring out how to hook up the controls.
I want to use the heat pump when the outside temperature is warmer than abo
ut 45 degrees and shift the propane furnace whon the temperature is colder.
Sure I could save some by using the heat pump at lower outside temperatur
es , but the underground storage tank agreement calls for using at least 25
0 gallons of propane per year. So why subject the heat pump to running at
low outside temperatures.
So I am hoping to get some recommendations on thermostats and outside therm
ostats. I do not want a system that connects to the internet. I do not ha
ve a smart phone and do not know why I would want to control the house temp
erature using a smart phone.
I probably left out some needed information. Oh yeah , I am an EE so you
can rag me about that.