Variable Speed residential motors ; too long a payback ??

[HVAC fella]

On a fractional h.p. blower motor thats variable speed....is there any data published on expected electrical savings for a residential AHU application ?

[Bill]

Yes but you'd have to subscribe to a trade mag like the RSES Journal.

[Jeffrey Lebowski]

[Wu Tang]

if you search google with the argument (without quotes) "variable speed energy savings", you will locate several document which address the issue

empirically, you can calculate an approximate estimate, considering an average hp vs motor consuming 42w versus 1000w (or more) for a non-vs motor, using an average cost of electricity at 0.13 cents/kWh (use appropriate rate for your region)

in a modern hp installation, other factors come to play when calculating length of payback, not only the single component of variable speed blower

[Tony]

Why did you have to say that now he is totally confuse including Mua! tony