central ac air handler

Does a new air handler have to be installed with new duct work simultaneously? We need to install a new cac system, but are planning major renovation to our home next year. Unfortunately, our cac compressor isn't goint to work for the upcoming winter. We would like to install a high seer system, but were told we would need a new air handler.
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ADEL wrote:

It depends on what changes are going to be made. They need to be sized correctly or you may get poor results and damaged equipment.
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Joseph E. Meehan

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sized
Seems to me that a GOOD hvac man can put in a system with a variable speed fan in the air handler and use the existing duct work. It may make a little more noise than with the proper ducts but you will get most of the efficiency you want.
It would take a GROSS mis-design of the duct work to "damage" the system.
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John Gilmer wrote:

I agree. I should have taken my answer further and indicated that the specific situation needs to be examined by a GOOD HVAC professional. Of course it does not take much of a sizing error to cause poor performance.
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Joseph E. Meehan

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I should think the O.P. could have heat gain/loss calculation and duct design for the final arrangement and size of things, then live with a possibly mis sized AHU for a year. TB
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I have been looking into replacing my a/c unit. Garage ceiling mounted air handler and compressor outside. Noisy as,,,,,, well you get the idea. Every site and every contractor I have checked, 20 odd. Says the same thing, the compressor, high seer MUST be matched to the air handler. Which means if your changing from a 10 to a 12 why bother. If like me changing from a 10 to a 14 why would I not get the max out of the compressor. Sort of like having a race car and putting low end tires on it, then expecting it to handle correctly
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snipped-for-privacy@hotmail.com (ADEL) wrote in message

Can you clarify? When I see "compressor" and "winter" I think heat pump, not straight A/C. If so, can you run emergency heat, portable electric heaters, or perhaps kerosene next winter? Basically, hold off until you can put a complete new system in. Otherwise, you'll become well-acquainted with the concept of "time and material." Additionally, it's usually a really bad idea to run an HVAC system during construction. Better to trash the old system than a new one.
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