2 blowers matched to 1 condenser

[hmmm]

Would like to have central air installed, and would prefer 2 zones instead of 1 (2 story house, plus attic and basement). Contractors keep quoting 2 complete systems (i.e., two 2-ton blowers attached to two 2-ton condenser). Why not attach two 2-ton blowers to one 4-ton condenser?? Wouldn't this save $$, or is it just not possible to configure this way?

Thanks.

[star882]

Then it's a one zone system again...
Actually, with the right parts (variable speed compressor, EEVs), it will work, but will end up costing at least as much as two separate systems, and you lose redundancy.

[hmmm]

i don't understand how it becomes 1 zone again. if i only want to cool the downstairs, turn on that blower and upstairs remains off. i thought that was the point of having 2 zones?

if costs the same, and lose redundancy, doesn't make sense. just thought it might be cheaper to pay for 1 bigger condenser than 2 smaller ones

[-80guru]

When one thermostat satisfies thereby shutting off one airhandler/blower/evaporatr. You will then wind up with a 4 ton condensing unit operating with a 2 ton airhandler/blower/evaporator and that would put the system way out of design specs and possibly cause premature failure.

[t527ed]

2 complete systems or 1 system and zoning controls.