Changing a two wire Thermostat to a 5 wire or just 3?

I have a home built in 2006. It has baseboard heating and Air Condition vi a blown air<Ceiling Vents>. The upstairs zone contains a 5 wire thermostat while the downstairs zone is only two wires? The AC unit is in the attic. Is it possible to run a 5 wire or 3 wire to the thermostat on the first fl oor? I am looking to add a Honeywell wifi thermostat.
Thanks!
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snipped-for-privacy@gmail.com wrote:

2 wire means it only controls base board heating? It sounds like this one is heat only or cool only 'stat. 5 wires are for both heat and cool control. WiFi 'stat needs to be connected to a router for remote access. If that is what you have in mind look at also Ecobee. I installed Ecobee at my daughter's 2nd home and it already did it's worth this winter when furnace quit(burnt HSI fault), it sent alarm to my daughter's iphone preventing possible freezing in the house.
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On Tuesday, April 1, 2014 7:09:18 PM UTC-4, Tony Hwang wrote:

stat while the downstairs zone is only two wires? The AC unit is in the at tic. Is it possible to run a 5 wire or 3 wire to the thermostat on the firs t floor? I am looking to add a Honeywell wifi thermostat.

Sounds like April fools day. If he has heat and AC, then how does the existing thermostat only have 2 wires? But if it's somehow true and it's too hard to run wires, I seem to recall seeing a wire expansion widget, where you put a multiplexer at the furnace and one at the thermostat and it turned 2 or 3 wires into 6 or whatever.
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snipped-for-privacy@gmail.com;3217362 Wrote:

"Heating Help" that has a DIY Q&A forum just like this one, but is populated with heating contractors.
'Heating Help - Heating Systems' (http://www.heatinghelp.com )
--
nestork

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