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how old? gas ? elec? more info...

the absolute truth is this, Contractors will brag on the ones they sell, run down the ones they don't, They all have their pro's and con's,

consider this. Every company has several brands....

check to see if the valve is getting the 23 volts, if not, trace it down, something is not letting the valve open. I beleive if the pressure switch from the vent fan is not operating the Electronic...

Millivolt ? I'd change that reguardless. Next I'd check to see the light on the board. There could be a problem with the board but if you have changed it more than once with the same problem there is...

When a contractor gives you his bid , it is not just for the equipment, it is for his work. Why one is cheaper than the other depends on a lot of things. for one the area. I live in a smaller size...

With roughly 1800 Square feet your looking at 3.5 ton. You might even want to go with 4 ton. You will need to change your duct also. You figure (roughly)500 square feet per ton. depending on how many...