Re: [OM] OT: Air-source Heat Pump?

[Mike Lazzari]

I think a major problem in updating a forced air furnace is that the 
ducting  is designed for the old system. Frankly many houses I've seen 
were not designed at all rather a seat of the pants installation relying 
upon brute force. Usually the system is sized too small for the needs of 
a modern furnace. Particularly the design of the return air. Before 
investing in a new furnace have someone run the calcs on your old 
existing system to see if it also needs to be updated to move lower 
velocity air.

Mike
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