A/C equipment is in good condition (no fins bent on condenser, fairly clean evaporating coil, works well, SEER 13, etc...) but is now seriously oversized after putting in better insulation (yes there's enough fresh air ). It's currently 3 tons, but I'm fairly sure that 1.5 would now be enough, just from the running times. What should I ask for in bids for the work to correct this? In an oversized system, should everything get replaced or is it possible to replace only the coil or condenser and still operate at a reasonable efficiency? I'm looking forward to a quieter system that controls humidity better.
If the condenser should be replaced, I have a preference for easy to clean condensers with sturdy and well protected fins. Any suggestions on how to ask for this?
Also, I'd like to be able to run the fan continuously on my current ECM furnace, but without re-evaporating the water condensed on the evaporating coil, after the condenser stops running. I'm wondering how to ask for this without being sold extravagant solutions, or being misunderstood. Should I ask for something specific like positive closure motorized dampers that open an alternate air path while blocking air through the coil, or leave it to the HVAC company to figure out something? If I ask for something specific, it should be easier to compare bids.
Thanks to your help, I hope to do the bidding process only once and correctly, and not waste anyone's time.