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> The problem is that the fan is interlocked with <BR>
> the fan circuit on the furnace so when the range <BR>
> hood comes on the furnace blower and A/C also <BR>
> will come on. You must isolate the fan circuit <BR>
> with a relay so that the "G" circuit being <BR>
> energised will not back feed right back thru the <BR>
> T-stat and energise the cooling circuit. The <BR>
> same thing would happen if you were to use your <BR>
> jumper and jump R to G. the cooling will come <BR>
> on. <BR>
> Install a Double pole/Double throw relay <BR>
> at the furnace. The wire coming from the stat to <BR>
> "G" must go thru the n-c set of contacts. The n-o <BR>
> set of contacts will be used to also energise <BR>
> "G", but only if the Range hood is turned on. The <BR>
> relay will now be energised from what ever <BR>
> actuates the Range hood. Do you <BR>
> Mike T. <BR>