Our 100+ yr old house currently has 3 separate forced hot air gas-fired heating units.
We would like to add central air sharing the same ductwork and blowers.
The "traditional" approach would be to add a separate compressor/evaporator for each of the 3 heating units.
I have seen that some high end remodels are using a single chilled water unit to supply coolant to multiply blower units and that this is somehow "better".
Can anyone comment on the pros/cons and appropriateness of using such a system residentially?
I am particularly interested in comparing initial cost (equipment & installation), efficiency, noise-level, and reliability.
I will be hiring a reputable HVAC contractor for the installation.
Thanks.