I own a 25pdvc and wanted to know if i can wire it up on a existing t-stat that i have for my a/c. Its a honeywell 5110d that controls both a/c and heat but its only wired up for a/c since i have no heat pump. Its battery powered so im guessing its a millivolt stat but cant find any instructions on the internet and honeywell says to hire a contractor. I really dont want to do that since its a two wire hook up i just need to know how to do it. Thanks for any help,