This may sound strange, but we bought an old house, and don't really understand the heating system we have (no users manuals left behind). This came about when we tried to install a programmable thermostat, and found too many wires/different letters for the standard unit. We then took a closer look.
Aparrently this was all installed 10 years ago.
The furnace is a gas - simple enough. Beside it is a heat/air exchanger (I think that's what it's called - it brings in fresh air from the outside and exhausts air from the inside warming the air slightly from the outside). This unit can be switched on and off by itself and has it's own fan. In front of this is what is labelled a heat pump (there are pipes running to the air conditioning unit sitting outside, but no other pipes running into the ground). We're guessing that the condenser to the Air Conditioner is the unit outside.
My question is - what does all this do (Individually I have a good idea - but all together????)
The original thermostat also has an extra setting labelled EM Heat (what in the buns is that?)
Any information would be greatly appreciated.
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